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Mockito - NullpointerException when invoking method from Service

Hi I am trying to test the method but it returned null and I don't know why; Method should work properly but still, I have NullPointerException
#Service
public class AzureCloudStorageService implements FileService {
private final String connectionString;
private final String containerName;
private final ModelMapper modelMapper;
public AzureCloudStorageService(#Autowired PropertyResolver propertyResolver,
ModelMapper modelMapper) {
this.connectionString = propertyResolver.getProperty("azure.connection.string");
this.containerName = propertyResolver.getProperty("azure.container.name");
this.modelMapper = modelMapper;
}
public MultipartFile convertToMultipartImage(String image) {
try {
return modelMapper.map(image, MultipartFile.class);
} catch (Exception e) {
throw new BadRequestException(ErrorMessage.MULTIPART_FILE_BAD_REQUEST + image);
}
}
and the test method, maybe it`s because of final methods or something, I have no idea
#ExtendWith(SpringExtension.class)
class AzureCloudStorageServiceTest {
#Mock
private ModelMapper modelMapper;
#Mock
private AzureCloudStorageService azureCloudStorageService;
#Test
void convertToMultipartImage(){
MultipartFile multipartFile = ModelUtils.getFile();
String image = "Image";
when(modelMapper.map(image, MultipartFile.class)).thenReturn(multipartFile);
MultipartFile actual = azureCloudStorageService.convertToMultipartImage("Image");
assertEquals(multipartFile, actual);
}
}
there is stacktrace for my program. Some exceprion and error, sorry for screens in comment but i didnt see how to edit
org.opentest4j.AssertionFailedError:
Expected :org.springframework.mock.web.MockMultipartFile#441cc260
Actual :null
<Click to see difference>
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)
at greencity.service.AzureCloudStorageServiceTest.convertToMultipartImage(AzureCloudStorageServiceTest.java:46)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

Your problems stems from the wrong way you do your mocks. In your code you do the following:
#Mock
private AzureCloudStorageService azureCloudStorageService;
Which effectively returns a mocked instance of AzureCloudStorageService. This is not what you want and need for this case, as this is what you need to test (i.e the unit under test). What you need to do though is to manually instantiate the AzureCloudStorageService by calling its constructor and passing in the mocked ModelMapper as well as PropertyResolver.

Instead of
#Mock
private ModelMapper modelMapper;
Use into the method or in #Before method:
ModelMapper modelMapper = Mockito.mock(ModelMapper.class);
It is working for me:
ServicioCalls servicioCalls = Mockito.mock(ServicioCalls.class);
EncapsulatedError<?> encapsulatedError = new EncapsulatedError<>(SpResult.SUCCESS_CODE, SpResult.OK, 0, null);
Mockito.doReturn(encapsulatedError).when(servicioCalls).obtenerCalls(anyString(), anyString(), anyLong());

It`s working properly and covering my method and constructor) Thank you akortex
#Test
void convertToMultipartImage(){
MultipartFile multipartFile = Mockito.mock(MultipartFile.class);
AzureCloudStorageService azureCloudStorageService = new AzureCloudStorageService(propertyResolver, modelMapper);
String image = "Image";
when(modelMapper.map(image, MultipartFile.class)).thenReturn(multipartFile);
assertEquals(multipartFile, azureCloudStorageService.convertToMultipartImage("Image"));
}

Ok, try with it:
Change this:
when(modelMapper.map(image, MultipartFile.class)).thenReturn(multipartFile);
By this:
Mockito.doReturn(modelMapper).when(modelMapper).map(anyString(), any());
And set to azureCloudStorageService the mockling object modelMapper previos to call:
azureCloudStorageService.setModelMapper(modelMapper);
MultipartFile actual = azureCloudStorageService.convertToMultipartImage("Image");
assertEquals(multipartFile, actual);

Ok, do you can use inheritance, creates a class dummy like it
private static class CallsRestStub extends CallsRest {
}
When CallsRest is the original class and modelMapper protected.
With it you can creates a instance of CallsRestStub instead CallSRest and sets to it the mocking object

How to debug the error: java.lang.AssertionError: No value at JSON path "$.name"

I am writing an app which is meant to help general doctors in treating elderly people. The goal is to avoid polypharmacy and it is based on the ATC (Anatomical Therapeutical Chemical) classification. I wrote a method that ads active substance to the DB and it works (I checked it on the h2 db) but I cannot write a proper test.
How can I investigate this problem?
Here is my test class:
package com.example.geriafarm.controllers;
import com.example.geriafarm.DTO.ATCdto;
import com.example.geriafarm.DTO.ActiveSubstDTO;
import com.example.geriafarm.entities.ATC;
import com.example.geriafarm.entities.ActiveSubst;
import com.example.geriafarm.repositories.ActiveSubstRepository;
import com.example.geriafarm.services.ATCService;
import com.example.geriafarm.services.ActiveSubstService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.ResultMatcher;
import org.springframework.transaction.annotation.Transactional;
import java.util.UUID;
import static java.lang.String.format;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.when;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import static org.hamcrest.Matchers.is;
#SpringBootTest
#AutoConfigureMockMvc
public class ActiveSubstControllerTest {
#Autowired
private MockMvc mockMvc;
#MockBean
private ActiveSubstService activeSubstService;
#Autowired
ActiveSubstRepository activeSubstRepository;
#Test
#Transactional
void shouldAddActiveSubstance() throws Exception {
final UUID id = new UUID(1234,567);
final String testName = "furosemid";
final String atcDTOTest = "C03CA01";
final ATC testATC = new ATC(null, "C","03","C","A","01");
final ActiveSubst activeSubstTest = new ActiveSubst(id,testName, testATC);
when(activeSubstService.addSubstance(any(ActiveSubstDTO.class))).thenReturn(activeSubstTest.getId());
mockMvc.perform(
post("/activesubstances")
.contentType(MediaType.APPLICATION_JSON)
.content(format("{\"name\":\"%s\",\"atc\":\"%s\"}", testName, atcDTOTest)))
.andDo(print())
.andExpect(status().isCreated())
.andExpect(jsonPath("$.name", is(testName)))
.andExpect(jsonPath("$.atc", is(atcDTOTest)));
}
}
This is the ActiveSubstanceService class:
package com.example.geriafarm.services.implementation;
import com.example.geriafarm.DTO.ATCdto;
import com.example.geriafarm.DTO.ActiveSubstDTO;
import com.example.geriafarm.entities.ATC;
import com.example.geriafarm.entities.ActiveSubst;
import com.example.geriafarm.repositories.ATCRepository;
import com.example.geriafarm.repositories.ActiveSubstRepository;
import com.example.geriafarm.services.ActiveSubstService;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Optional;
import java.util.UUID;
#Service
public class DefaultActiveSubstService implements ActiveSubstService {
private final ActiveSubstRepository activeSubstRepository;
private final ATCRepository atcRepository;
public DefaultActiveSubstService(ActiveSubstRepository activeSubstRepository, ATCRepository atcRepository) {
this.activeSubstRepository = activeSubstRepository;
this.atcRepository = atcRepository;
}
#Override
public List<ActiveSubstDTO> getSubstances() {
return null;
}
public static ATC createATCEntity(ATCdto atcDto) { //metoda przepisuje dane z frontendu(ATCdto) do poszczególnych pól w bazie danych
ATC atcEntity = new ATC();
atcEntity.setAnatomicalGr(atcDto.getAtcDto().substring(0, 1));
atcEntity.setTherapeutSubgr(atcDto.getAtcDto().substring(1, 3));
atcEntity.setPharmacolSubgr(atcDto.getAtcDto().substring(3, 4));
atcEntity.setChemicalSubgr(atcDto.getAtcDto().substring(4, 5));
atcEntity.setChemicalSubst(atcDto.getAtcDto().substring(5));
return atcEntity;
}
#Override
public UUID addSubstance(ActiveSubstDTO activeSubstDTO) {
final ActiveSubst activeSubst = activeSubstRepository.saveAndFlush(new ActiveSubst(null, activeSubstDTO.getName(), createATCEntity(activeSubstDTO.getAtc())
)
);
return activeSubst.getId();
}
#Override
public Optional<ActiveSubstDTO> getSubstanceById(String id) {
return activeSubstRepository.findById(UUID.fromString(id)).map(ActiveSubstDTO::fromActiveSubstEnt);
}
#Override
public ActiveSubstDTO updateSubstance(String id, ActiveSubstDTO activeSubstDTO) {
return null;
}
#Override
public List<ActiveSubstDTO> getSubstancesByMedicine(UUID medicineId) {
return null;
}
#Override
public List<ActiveSubstDTO> getSubstancesByAnatomicalGroup(ATCdto atcDto) {
return null;
}
#Override
public List<ActiveSubstDTO> getSubstancesByTherapeuticSubgroup(ATCdto atcDto) {
return null;
}
}
And finally the controller:
package com.example.geriafarm.controllers;
import com.example.geriafarm.DTO.ActiveSubstDTO;
import com.example.geriafarm.exceptions.GeriaException;
import com.example.geriafarm.services.ActiveSubstService;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.UUID;
#RestController
#RequestMapping("/activesubstances")
public class ActiveSubstController {
private final ActiveSubstService activeSubstService;
public ActiveSubstController(ActiveSubstService activeSubstService) {
this.activeSubstService = activeSubstService;
}
#PostMapping
public ResponseEntity<Void> addActiveSubst (#RequestBody ActiveSubstDTO activeSubstDTO) throws GeriaException, URISyntaxException {
UUID activeSubstId = activeSubstService.addSubstance(activeSubstDTO);
return ResponseEntity
.created(new URI("/activesubstances/" + activeSubstId))
.build();
}
}
Edit: And here's the stack of error that I get:
MockHttpServletRequest:
HTTP Method = POST
Request URI = /activesubstances
Parameters = {}
Headers = [Content-Type:"application/json;charset=UTF-8", Content-Length:"36"]
Body = {"name":"furosemid","atc":"C03CA01"}
Session Attrs = {}
Handler:
Type = com.example.geriafarm.controllers.ActiveSubstController
Method = com.example.geriafarm.controllers.ActiveSubstController#addActiveSubst(ActiveSubstDTO)
Async:
Async started = false
Async result = null
Resolved Exception:
Type = null
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 201
Error message = null
Headers = [Location:"/activesubstances/00000000-0000-04d2-0000-000000000237"]
Content type = null
Body =
Forwarded URL = null
Redirected URL = /activesubstances/00000000-0000-04d2-0000-000000000237
Cookies = []
MockHttpServletRequest:
HTTP Method = POST
Request URI = /activesubstances
Parameters = {}
Headers = [Content-Type:"application/json;charset=UTF-8", Content-Length:"36"]
Body = {"name":"furosemid","atc":"C03CA01"}
Session Attrs = {}
Handler:
Type = com.example.geriafarm.controllers.ActiveSubstController
Method = com.example.geriafarm.controllers.ActiveSubstController#addActiveSubst(ActiveSubstDTO)
Async:
Async started = false
Async result = null
Resolved Exception:
Type = null
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 201
Error message = null
Headers = [Location:"/activesubstances/00000000-0000-04d2-0000-000000000237"]
Content type = null
Body =
Forwarded URL = null
Redirected URL = /activesubstances/00000000-0000-04d2-0000-000000000237
Cookies = []
2021-06-30 17:45:11.429 INFO 20568 --- [ main] o.s.t.c.transaction.TransactionContext : Rolled back transaction for test: [DefaultTestContext#43aaf813 testClass = ActiveSubstControllerTest, testInstance = com.example.geriafarm.controllers.ActiveSubstControllerTest#7d28efd5, testMethod = shouldAddActiveSubstance#ActiveSubstControllerTest, testException = java.lang.AssertionError: No value at JSON path "$.name", mergedContextConfiguration = [WebMergedContextConfiguration#57ac5227 testClass = ActiveSubstControllerTest, locations = '{}', classes = '{class com.example.geriafarm.GeriafarmApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[[ImportsContextCustomizer#4ba302e0 key = [org.springframework.boot.test.autoconfigure.web.servlet.MockMvcAutoConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcWebClientAutoConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcWebDriverAutoConfiguration, org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration, org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration, org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration, org.springframework.boot.test.autoconfigure.web.servlet.MockMvcSecurityConfiguration]], org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer#23202fce, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer#6f1c29b7, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer#763dd5d5, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer#2b72cb8a, org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer#5d99c6b5, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer#4b3fa0b3, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer#52e7a6b2, org.springframework.boot.test.context.SpringBootTestArgs#1, org.springframework.boot.test.context.SpringBootTestWebEnvironment#133e16fd], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true, 'org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]]
java.lang.AssertionError: No value at JSON path "$.name"
at org.springframework.test.util.JsonPathExpectationsHelper.evaluateJsonPath(JsonPathExpectationsHelper.java:304)
at org.springframework.test.util.JsonPathExpectationsHelper.assertValue(JsonPathExpectationsHelper.java:73)
at org.springframework.test.web.servlet.result.JsonPathResultMatchers.lambda$value$0(JsonPathResultMatchers.java:87)
at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:196)
at com.example.geriafarm.controllers.ActiveSubstControllerTest.shouldAddActiveSubstance(ActiveSubstControllerTest.java:63)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.lang.IllegalArgumentException: json can not be null or empty
at com.jayway.jsonpath.internal.Utils.notEmpty(Utils.java:386)
at com.jayway.jsonpath.JsonPath.read(JsonPath.java:342)
at com.jayway.jsonpath.JsonPath.read(JsonPath.java:329)
at org.springframework.test.util.JsonPathExpectationsHelper.evaluateJsonPath(JsonPathExpectationsHelper.java:301)
... 69 more
I'm new to Java and coding in general.

Well, after looking at your code, your POST method does not return a JSON payload with name and atc as part of it.
#PostMapping
public ResponseEntity<Void> addActiveSubst (#RequestBody ActiveSubstDTO activeSubstDTO) throws GeriaException, URISyntaxException {
UUID activeSubstId = activeSubstService.addSubstance(activeSubstDTO);
return ResponseEntity
.created(new URI("/activesubstances/" + activeSubstId))
.build(); // <-- you are returning an UUID only.
}
In your tests, you are asserting that you expect .andExpect(jsonPath("$.name", is(testName))) and .andExpect(jsonPath("$.atc", is(atcDTOTest))) in the Response, which does not match with your Controller.
You could give it a shot with this instead. In the end, your assertion must match the output of your Controller method.
mockMvc.perform(
post("/activesubstances")
.contentType(MediaType.APPLICATION_JSON)
.content(format("{\"name\":\"%s\",\"atc\":\"%s\"}", testName, atcDTOTest)))
.andDo(print())
.andExpect(status().isCreated());
Edit: Added one last comment on this answer, and changed to reflect the last proposal.

Can you put the stack of error in your question?
Maybe your json from return of body of request, hasn`t a property with "name".
with your stack your body from return is empty.
MockHttpServletResponse:
Status = 201
Error message = null
Headers = [Location:"/activesubstances/00000000-0000-04d2-0000-000000000237"]
Content type = null
Body =
Forwarded URL = null
Redirected URL = /activesubstances/00000000-0000-04d2-0000-000000000237
Cookies = []
you can remove the test of content like:
mockMvc.perform(
post("/activesubstances")
.contentType(MediaType.APPLICATION_JSON)
.content(format("{\"name\":\"%s\",\"atc\":\"%s\"}", testName, atcDTOTest)))
.andDo(print())
.andExpect(status().isCreated())
or you can put the responseEntity from controller to return a DTO object with informations, and check it.

In your controller, you're returning an empty body (ResponseEntity<Void>) with a Location header:
return ResponseEntity
.created(new URI("/activesubstances/" + activeSubstId))
.build();
And in the test, you're expecting a JSON with name and atc fields in it:
.andExpect(jsonPath("$.name", is(testName)))
.andExpect(jsonPath("$.atc", is(atcDTOTest)));
Therefore, the test is correctly failing.
What you have to fix is:
If your want to return an empty body, remove the aforementioned lines from the test. You may just check the Location header instead.
If your want to return the JSON in the response body (I guess you expected it to be ActiveSubstDTO?), you have to return the appropriate ResponseEntity<YourResponseType> instead (e.g. ResponseEntity<ActiveSubstDTO>).

Why Mockito says that my stubbings are unnecessary

I'm trying to mock Spring's ConversionService so convert() method always returns the dto created by me, but Mockito says that my stubbings are unnecessary and mocked ConversionService returns null.
Here's the code:
StudentServiceTests
package com.mdv.secondservice;
import com.mdv.secondservice.api.dto.ThirdServiceStudentDto;
import com.mdv.secondservice.api.proxy.ThirdServiceProxy;
import com.mdv.secondservice.db.model.Student;
import com.mdv.secondservice.db.repository.StudentRepository;
import com.mdv.secondservice.service.StudentService;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.core.convert.ConversionService;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.when;
#SpringBootTest
#ExtendWith(MockitoExtension.class)
public class StudentServiceTests {
#Mock
private StudentRepository studentRepository;
#Mock
private ConversionService conversionService;
#Mock
private ThirdServiceProxy thirdServiceProxy;
#InjectMocks
private StudentService studentService;
private Student student;
private ThirdServiceStudentDto thirdServiceStudentDto;
#BeforeEach
void init() {
final String middleName = "middleName";
final String lastName = "lastName";
student = Student.builder()
.middleName(middleName)
.lastName(lastName)
.build();
thirdServiceStudentDto = new ThirdServiceStudentDto(lastName);
}
#Test
void createStudent_StudentWasCreated() {
when(conversionService.convert(any(Student.class), same(ThirdServiceStudentDto.class)))
.thenReturn(thirdServiceStudentDto);
when(thirdServiceProxy.createStudent(any(ThirdServiceStudentDto.class))).thenReturn(student);
when(studentService.createStudent(student)).thenReturn(student);
Student returnedStudent = studentService.createStudent(student);
assertThat(returnedStudent).isEqualTo(student);
}
}
StudentService
package com.mdv.secondservice.service;
import com.mdv.secondservice.api.dto.ThirdServiceStudentDto;
import com.mdv.secondservice.api.proxy.ThirdServiceProxy;
import com.mdv.secondservice.db.model.Student;
import com.mdv.secondservice.db.repository.StudentRepository;
import feign.FeignException;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.convert.ConversionService;
import org.springframework.stereotype.Service;
#Service
#Slf4j
#RequiredArgsConstructor
public class StudentService {
private final StudentRepository studentRepository;
private final ConversionService conversionService;
private final ThirdServiceProxy thirdServiceProxy;
public Student createStudent(Student student) throws FeignException.InternalServerError {
ThirdServiceStudentDto thirdServiceStudentDto =
conversionService.convert(student, ThirdServiceStudentDto.class);
Student createdStudent = thirdServiceProxy.createStudent(thirdServiceStudentDto);
createdStudent.setMiddleName(student.getMiddleName());
studentRepository.save(createdStudent);
return createdStudent;
}
}
It seems like I messed up with matchers in the first when call. I know I didn't mock StudentRepository, I will fix that later. The problem is that conversionService.convert(...) returns null when called in StudentService.createStudent method.
UPD (added Mockito error):
java.lang.NullPointerException
at com.mdv.secondservice.service.StudentService.createStudent(StudentService.java:26)
at com.mdv.secondservice.StudentServiceTests.createStudent_StudentWasCreated(StudentServiceTests.java:59)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:212)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:208)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Suppressed: org.mockito.exceptions.misusing.UnnecessaryStubbingException:
Unnecessary stubbings detected.
Clean & maintainable test code requires zero unnecessary code.
Following stubbings are unnecessary (click to navigate to relevant line of code):
1. -> at com.mdv.secondservice.StudentServiceTests.createStudent_StudentWasCreated(StudentServiceTests.java:56)
2. -> at com.mdv.secondservice.StudentServiceTests.createStudent_StudentWasCreated(StudentServiceTests.java:58)
Please remove unnecessary stubbings or use 'lenient' strictness. More info: javadoc for UnnecessaryStubbingException class.
at org.mockito.junit.jupiter.MockitoExtension.afterEach(MockitoExtension.java:181)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachCallbacks$11(TestMethodTestDescriptor.java:255)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$12(TestMethodTestDescriptor.java:271)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:271)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:270)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachCallbacks(TestMethodTestDescriptor.java:254)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:143)
... 41 more

When you mock everything, you dont need the spring boot context.
You can delete the #SpringBootTest.
And your example should run.
Otherwise you can replace #ExtendWith(MockitoExtension.class) with #ExtendWith(SpringExtension.class).

Try to test the Email Class with Mockito [duplicate]

This question already has answers here:
Mockito : how to verify method was called on an object created within a method?
(8 answers)
Closed 2 years ago.
I tried to test the following method sendMail
public void sendMail(Student student, String currentSubject, File file) {
String emailText = createCustomizedEmailBodyText(student, currentSubject);
String mail = student.getEmail();
String subject = "Ihr Zulassungsnachweis zum Fach: ";
sendMessage(mail, subject + currentSubject, emailText, file, file.getName());
file.deleteOnExit();
}
My test class so on
package mops.zulassung2.services;
import mops.zulassung2.model.dataobjects.Student;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import org.springframework.mail.javamail.JavaMailSender;
import java.io.File;
import static org.mockito.Mockito.mock;
class EmailServiceTest {
static EmailService emailServices = mock(EmailService.class);
static EmailService emailService;
static SignatureService signatureService = mock(SignatureService.class);
#BeforeAll
static void setUp() {
JavaMailSender javaMailSender = mock(JavaMailSender.class);
emailService = new EmailService(javaMailSender, signatureService);
}
#Test
void sendMail() {
Student student = new Student("272490", "snami100#uni-duesseldorf.de", "Amin", "Snur");
String subject = "Informatik";
File file = mock(File.class);
Mockito.verify(emailServices).sendMail(student, subject, file);
}
}
In this test i just want to know if the method sendMail is called (with the params)
Im new at programming and maybe someone could help me
This is the error i got when i try to run the test, i dont know what it mean, so maybe someone could help me to make the the test running and sucess, thanks....
Wanted but not invoked:
emailService.sendMail(
mops.zulassung2.model.dataobjects.Student#327fca0d,
"Informatik",
Mock for File, hashCode: 1035729309
);
-> at mops.zulassung2.services.EmailServiceTest.sendMail(EmailServiceTest.java:31)
Actually, there were zero interactions with this mock.
Wanted but not invoked:
emailService.sendMail(
mops.zulassung2.model.dataobjects.Student#327fca0d,
"Informatik",
Mock for File, hashCode: 1035729309
);
-> at mops.zulassung2.services.EmailServiceTest.sendMail(EmailServiceTest.java:31)
Actually, there were zero interactions with this mock.
at mops.zulassung2.services.EmailServiceTest.sendMail(EmailServiceTest.java:31)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:125)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:132)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:124)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:74)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:104)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:62)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:43)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:35)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:202)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:198)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:69)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1507)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1507)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:99)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at com.sun.proxy.$Proxy2.stop(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:132)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:412)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.base/java.lang.Thread.run(Thread.java:830)

Tests should follow the structure Given-When-Then (GWT).
In your code you have then Given and the Then but the When (emailServices.sendMail() call) is missing:
#Test
void sendMail() {
// Given
Student student = new Student("272490", "snami100#uni-duesseldorf.de", "Amin", "Snur");
String subject = "Informatik";
File file = mock(File.class);
// When
emailServices.sendMail(student, subject, file);
// Then
Mockito.verify(emailServices, times(1)).sendMail(student, subject, file);
Mockito.verify(emailServices, times(1)).sendMessage(anyString(), anyString(), anyString(), anyObject(), anyString());
}

It's a bit hard to be sure because I don't know what class the sendMail method is in.
Also, you might get yourself in trouble with setting up all your mocked variables in as class-wide variables with the use of static and #BeforeAll instead of #BeforeEach.
The basic problem with your test is that you aren't calling the method you are trying to test.
I think you are trying to do something like this:
#Test
void sendMail() {
// Given
Student student = new Student("272490", "snami100#uni-duesseldorf.de", "Amin", "Snur");
String subject = "Informatik";
File file = mock(File.class);
// When
emailServices.sendMail(student, subject, file);
// Then
Mockito.verify(something).sendMessage(eq(student), eq(subject), eq(file));
Mockito.verify(file).deleteOnExit();
}
As #jeprubio said, it will help to organize your tests in the Given-When-Then format so you are more clear on what you are assuming about your test and what you are testing.

NPE returned by a mocked function spring boot

I'm new to testing and I'm trying to learn unit testing using JUnit and spring boot and that exception popped up.
As you can see I mocked the behavior of the function I needed in the TopicSevices but I still get this NPE, I also tried to add
MockitoAnnotations.initMocks(this);
But it didn't work.
The controller code
package com.example.test.controller;
import java.util.List;
import javax.validation.Valid;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.example.test.Services.ExerciceServices;
import com.example.test.Services.TopicService;
import com.example.test.model.Difficulty;
import com.example.test.model.Exercice;
import com.example.test.model.Status;
import com.example.test.model.dto.ExerciceDTO;
#CrossOrigin("*")
#RestController
public class ExerciceController {
private final ExerciceServices exerciceServices;
private final TopicService topicServices;
public ExerciceController(ExerciceServices exerciceServices, TopicService topicServices) {
this.exerciceServices = exerciceServices;
this.topicServices = topicServices;
}
#GetMapping("/exercices")
public List<Exercice> allExercices() {
return exerciceServices.getAllExecices();
}
#PostMapping("/exercices")
public Exercice createExercice(#Valid #RequestBody ExerciceDTO dto) {
Exercice exercice = createExcerciceFromDto(dto);
return exerciceServices.CreateeExercice(exercice);
}
public Exercice createExcerciceFromDto(ExerciceDTO dto) {
Exercice exercice = new Exercice();
exercice.setDifficulty(dto.getDifficulty());
exercice.setImg(dto.getImg());
exercice.setStatus(dto.getStatus());
exercice.setTitle(dto.getTitle());
for (Long id : dto.getListToppicId()) {
try {
System.out.println(topicServices.getTopicById(id));
} catch (Exception e) {
e.printStackTrace();
}
}
return exercice;
}
#GetMapping("/exercices/filter")
public List<Exercice> getExeerciceByDifficulty(#RequestParam(required = false) Long id,
#RequestParam Difficulty difficulty, #RequestParam Status status) {
return exerciceServices.exercicesFilterTopic(id, difficulty, status);
}
}
The test code
package com.example.test.controller;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Optional;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mockito;
import org.mockito.junit.MockitoJUnitRunner;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.test.web.servlet.MockMvc;
import com.example.test.Services.ExerciceServices;
import com.example.test.Services.TopicService;
import com.example.test.model.Difficulty;
import com.example.test.model.Exercice;
import com.example.test.model.Status;
import com.example.test.model.Topic;
import com.example.test.model.dto.ExerciceDTO;
#RunWith(MockitoJUnitRunner.class)
#WebMvcTest
class ExerciceControllerTest {
#MockBean
private ExerciceServices exerciceServices;
#MockBean
private TopicService topicServices;
#InjectMocks
private ExerciceController exerciceController;
ExerciceDTO dto = new ExerciceDTO();
Exercice e = new Exercice();
Topic t = new Topic();
#BeforeEach
public void setUp() throws Exception {
Mockito.when(exerciceServices.getAllExecices()).thenReturn(Arrays.asList(e));
}
#Test
public void givenDTOCreateTheExercice() {
dto.setDifficulty(Difficulty.EASY);
dto.setImg("link");
dto.setStatus(Status.FINISHED);
dto.setTitle("title");
dto.setListToppicId(new HashSet<>(Arrays.asList(6L)));
e.setDifficulty(Difficulty.EASY);
e.setImg("link");
e.setStatus(Status.FINISHED);
e.setTitle("title");
t.setId(6L);
t.setTitle("romayssae");
e.setTopics(new HashSet<>(Arrays.asList(t)));
Optional<Topic> topic = Optional.of(t);
Mockito.when(topicServices.getTopicById(6L)).thenReturn(topic);
System.out.println(topicServices.getTopicById(6L));
assertEquals(e, exerciceController.createExcerciceFromDto(dto));
}
}
The Exception
java.lang.NullPointerException
at com.example.test.controller.ExerciceController.createExcerciceFromDto(ExerciceController.java:58)
at com.example.test.controller.ExerciceControllerTest.givenDTOCreateTheExercice(ExcerciceControllerTest.java:77)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:125)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:132)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:124)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:74)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:104)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:62)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:43)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:35)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:202)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:198)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:69)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:137)
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

try to use #Mock instead of #MockBean. It should be ok

I tried this and it worked for me, however, I did not understand why.
In short, I changed the #Mock instead of #MockBean as suggested by #arbuzov. Then I got this exception:
java.lang.IllegalStateException: Failed to load ApplicationContext
To solve this I added this two annotations #SpringBootTest and #AutoConfigureMockMvc. Then I tried to test another method using the MockMvc there again the mocked behavior was ignored somehow, so I changed back to #MockBean which worked.
I would be happy to receive any comments and explanations of how it works, if anyone has any.
package com.example.test.controller;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Optional;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import com.example.test.Services.ExerciceServices;
import com.example.test.Services.TopicService;
import com.example.test.model.Difficulty;
import com.example.test.model.Exercice;
import com.example.test.model.Status;
import com.example.test.model.Topic;
import com.example.test.model.dto.ExerciceDTO;
#RunWith(SpringRunner.class)
#SpringBootTest
#AutoConfigureMockMvc
class ExerciceControllerTest {
#Autowired
private MockMvc mockMvc;
#MockBean
private ExerciceServices exerciceServices;
#Mock
private TopicService topicServices;
#InjectMocks
private ExerciceController exerciceController;
ExerciceDTO dto = new ExerciceDTO();
Exercice e = new Exercice();
Topic t = new Topic();
#BeforeEach
public void setUp() throws Exception {
}
#Test
public void givenDTOCreateTheExercice() {
assertEquals(e, exerciceController.createExcerciceFromDto(dto));
}
#Test
public void eznekfnzre() throws Exception {
dto.setDifficulty(Difficulty.EASY);
dto.setImg("link");
dto.setStatus(Status.FINISHED);
dto.setTitle("title");
dto.setListToppicId(new HashSet<>(Arrays.asList(6L)));
e.setDifficulty(Difficulty.EASY);
e.setImg("link");
e.setStatus(Status.FINISHED);
e.setTitle("title");
t.setId(6L);
t.setTitle("romayssae");
e.setTopics(new HashSet<>(Arrays.asList(t)));
Optional<Topic> topic = Optional.of(t);
Mockito.when(topicServices.getTopicById(6L)).thenReturn(topic);
Mockito.when(exerciceServices.getAllExecices()).thenReturn(Arrays.asList(e));
mockMvc.perform(get("/exercices/").contentType(MediaType.APPLICATION_JSON)).andExpect(status().isOk())
.andExpect(jsonPath("$[0].title", is(e.getTitle())));
}
}