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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

Jackson Not Correctly Parsing Data in Generic method - "class java.util.LinkedHashMap cannot be cast "

I am attempting to use OKHttp, Spring, and Jackson to retrieve JSON data from an API. At is most basic, the response from the API looks like:
{
"_page": 1,
"_total_items": 1,
"_items_this_page": 1,
"_index_start": 1,
"_index_end": 1,
"_links": {
"self": {
"href": ""
}
},
"some_key": [
{
"key": "value1"
},
{
"key": "value2"
}
]
}
I created a generic wrapper class:
public class PageWrapper<T> {
#JsonProperty("_links")
private PageLink links;
#JsonAlias({"documents", "employees"} )
private T pgData;
public T getPgData() {
return pgData;
}
public void setPgData(T pgData) {
this.pgData = pgData;
}
public PageLink getLinks() {
return links;
}
public void setLinks(PageLink links) {
this.links = links;
}
}
I created some tests to ensure it was being parsed correctly, and it worked as expected:
public void testEmployees() throws JsonParseException, JsonMappingException, IOException {
File file = new File(this.getClass().getClassLoader().getResource("employee.json").getFile());
var res = this.mapper.readValue(file, new TypeReference<PageWrapper<List<WBEmployee>>>() {
});
assertThat(res).isNotNull();
assertThat(res.getPgData().size()).isGreaterThan(0);
for(var r : res.getPgData()) {
assertThat(r.getAddress()).isNotNull();
assertThat(r.getBirthDate()).isNotBlank();
assertThat(r.getEmail()).isNotNull();
assertThat(r.getFirstName()).isNotNull();
assertThat(r.getLastName()).isNotNull();
}
}
The issue does not come until I run another test which interacts with the actual API:
#Test
public void testTestList() throws IOException {
var res = empAPI.getList();
assertThat(res).isNotNull();
assertThat(res.size()).isGreaterThan(0);
for(var r : res) {
assertThat(r.getAddress()).isNotNull();
assertThat(r.getBirthDate()).isNotBlank();
assertThat(r.getEmail()).isNotNull();
assertThat(r.getFirstName()).isNotNull();
assertThat(r.getLastName()).isNotNull();
}
}
This test calls the following method (through empAPI.getList()):
#Override
public <T> PageWrapper<List<T>> doNestedListGet(Class<T> type, HttpUrl url) throws IOException {
var req = this.reqBuilder.url(url).build();
try (var res = this.webClient.newCall(req).execute()) {
if (!res.isSuccessful()) {
throw new IOException(String.format("API call failed: %s", res));
}
var jString = res.body().string();
return this.mapper.readValue(jString, new TypeReference<PageWrapper<List<T>>>() {
});
}
}
In this example, jString and the contents of the file in the passing tests are the same (looked at them using the Debugger). However, I am receiving a class cast error:
java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class myClass
The getList() method called in the failing test looks like this:
public List<WBEmployee> getList(int page, WBEmploymentStatus employmentStatus) throws IOException {
var url = this.baseEndpoint.newBuilder()
.addQueryParameter("page", String.valueOf(page))
.addQueryParameter("status", employmentStatus.getDescr()).build();
return this.wbClient.doNestedListGet(WBEmployee.class, url).getPgData();
}
I am assuming the issue has to with the handling of generics (explicitly passing a class to TypeReference instead of T gets the expected results) , but not quite sure where the issue lies. Any advice would be appreciated.
Added full stack trace:
java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class com.midamcorp.wblib.model.WBEmployee (java.util.LinkedHashMap is in module java.base of loader 'bootstrap'; com.midamcorp.wblib.model.WBEmployee is in unnamed module of loader 'app')
at com.midamcorp.hcmadapter.client.EmployeeAPITest.testTestList(EmployeeAPITest.java:47)
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:84)
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:768)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)

How to mock objects from other classes created during InjectMocks?

I want to test my saveEmployee method but the problem is during #InjectMocks, constructor of EmployeeBase class is called and fetchEmployees() method is called. This method aim is to fetch data from database to employees List in the EmployeeBase class. The problem is this method use fields from Constants class and I am getting following result when I run the program. How to mock it properly?
class EmployeeBaseTest {
#InjectMocks
private EmployeeBase employeeBase;
#Mock
private Response response;
#BeforeEach
void beforeEach() {
MockitoAnnotations.openMocks(this);
}
#Test
void saveEmployeeTest() {
// given
Employee employee = new Employee();
// when
when(fetchEmployees()).thenReturn(Collections.emptyList());
employeeBase.saveEmployee(employee);
// then
assertEquals("TEST", response.getBody());
}
}
public class EmployeeBase {
private final Response response;
private final List<Employee> employees;
public EmployeeBase(Response response) {
this.response = response;
employees = fetchEmployees();
}
public void saveEmployee(Employee employee) {
//...
}
}
public final class EmployeeUtils {
private EmployeeUtils() {}
public static List<Employee> fetchEmployees() {
ScanRequest scanRequest = new ScanRequest().withTableName(EMPLOYEES);
ScanResult scanResult = AMAZON_DYNAMO_DB.scan(scanRequest);
List<Employee> employees = new ArrayList<>();
for (Map<String, AttributeValue> employee : scanResult.getItems()){
employees.add(parseEmployee(employee));
}
return employees;
}
}
public final class Constants {
protected static final String EMPLOYEES = "EMPLOYEES";
protected static final AmazonDynamoDB AMAZON_DYNAMO_DB = AmazonDynamoDBClientBuilder.defaultClient();
private Constants() {}
}
AFTER UPDATES
Still not working. Error I am getting:
C:\Users\michal\.jdks\corretto-11.0.10\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\lib\idea_rt.jar=55542:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\lib\idea_rt.jar;C:\Users\michal\.m2\repository\org\junit\platform\junit-platform-launcher\1.4.1\junit-platform-launcher-1.4.1.jar;C:\Users\michal\.m2\repository\org\junit\platform\junit-platform-engine\1.4.1\junit-platform-engine-1.4.1.jar;C:\Users\michal\.m2\repository\org\junit\vintage\junit-vintage-engine\5.3.2\junit-vintage-engine-5.3.2.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\plugins\junit\lib\junit5-rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\plugins\junit\lib\junit-rt.jar;C:\Users\michal\Documents\idea-projects\serverless\post-employee\target\test-classes;C:\Users\michal\Documents\idea-projects\serverless\post-employee\target\classes;C:\Users\michal\.m2\repository\com\amazonaws\aws-lambda-java-core\1.2.1\aws-lambda-java-core-1.2.1.jar;C:\Users\michal\.m2\repository\com\amazonaws\aws-lambda-java-events\3.6.0\aws-lambda-java-events-3.6.0.jar;C:\Users\michal\.m2\repository\joda-time\joda-time\2.6\joda-time-2.6.jar;C:\Users\michal\.m2\repository\com\amazonaws\aws-java-sdk-dynamodb\1.11.957\aws-java-sdk-dynamodb-1.11.957.jar;C:\Users\michal\.m2\repository\com\amazonaws\aws-java-sdk-s3\1.11.957\aws-java-sdk-s3-1.11.957.jar;C:\Users\michal\.m2\repository\com\amazonaws\aws-java-sdk-kms\1.11.957\aws-java-sdk-kms-1.11.957.jar;C:\Users\michal\.m2\repository\com\amazonaws\aws-java-sdk-core\1.11.957\aws-java-sdk-core-1.11.957.jar;C:\Users\michal\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\michal\.m2\repository\org\apache\httpcomponents\httpclient\4.5.13\httpclient-4.5.13.jar;C:\Users\michal\.m2\repository\org\apache\httpcomponents\httpcore\4.4.13\httpcore-4.4.13.jar;C:\Users\michal\.m2\repository\commons-codec\commons-codec\1.11\commons-codec-1.11.jar;C:\Users\michal\.m2\repository\software\amazon\ion\ion-java\1.0.2\ion-java-1.0.2.jar;C:\Users\michal\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.6.7.4\jackson-databind-2.6.7.4.jar;C:\Users\michal\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.6.0\jackson-annotations-2.6.0.jar;C:\Users\michal\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.6.7\jackson-core-2.6.7.jar;C:\Users\michal\.m2\repository\com\fasterxml\jackson\dataformat\jackson-dataformat-cbor\2.6.7\jackson-dataformat-cbor-2.6.7.jar;C:\Users\michal\.m2\repository\com\amazonaws\jmespath-java\1.11.957\jmespath-java-1.11.957.jar;C:\Users\michal\.m2\repository\org\projectlombok\lombok\1.18.18\lombok-1.18.18.jar;C:\Users\michal\.m2\repository\com\googlecode\json-simple\json-simple\1.1.1\json-simple-1.1.1.jar;C:\Users\michal\.m2\repository\junit\junit\4.10\junit-4.10.jar;C:\Users\michal\.m2\repository\org\hamcrest\hamcrest-core\1.1\hamcrest-core-1.1.jar;C:\Users\michal\.m2\repository\com\google\code\gson\gson\2.8.6\gson-2.8.6.jar;C:\Users\michal\.m2\repository\org\junit\jupiter\junit-jupiter-engine\5.3.2\junit-jupiter-engine-5.3.2.jar;C:\Users\michal\.m2\repository\org\apiguardian\apiguardian-api\1.0.0\apiguardian-api-1.0.0.jar;C:\Users\michal\.m2\repository\org\junit\platform\junit-platform-engine\1.3.2\junit-platform-engine-1.3.2.jar;C:\Users\michal\.m2\repository\org\opentest4j\opentest4j\1.1.1\opentest4j-1.1.1.jar;C:\Users\michal\.m2\repository\org\junit\jupiter\junit-jupiter-api\5.3.2\junit-jupiter-api-5.3.2.jar;C:\Users\michal\.m2\repository\org\mockito\mockito-inline\3.6.28\mockito-inline-3.6.28.jar;C:\Users\michal\.m2\repository\org\mockito\mockito-core\3.6.28\mockito-core-3.6.28.jar;C:\Users\michal\.m2\repository\net\bytebuddy\byte-buddy\1.10.18\byte-buddy-1.10.18.jar;C:\Users\michal\.m2\repository\net\bytebuddy\byte-buddy-agent\1.10.18\byte-buddy-agent-1.10.18.jar;C:\Users\michal\.m2\repository\org\objenesis\objenesis\3.1\objenesis-3.1.jar;C:\Users\michal\.m2\repository\org\junit\platform\junit-platform-commons\1.4.1\junit-platform-commons-1.4.1.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 EmployeeBaseTest,saveEmployeeTest
Apr 06, 2021 5:38:37 PM com.amazonaws.util.EC2MetadataUtils getItems
WARNING: Unable to retrieve the requested metadata (/latest/dynamic/instance-identity/document). Failed to connect to service endpoint:
com.amazonaws.SdkClientException: Failed to connect to service endpoint:
at com.amazonaws.internal.EC2ResourceFetcher.doReadResource(EC2ResourceFetcher.java:100)
at com.amazonaws.internal.EC2ResourceFetcher.doReadResource(EC2ResourceFetcher.java:70)
at com.amazonaws.internal.InstanceMetadataServiceResourceFetcher.readResource(InstanceMetadataServiceResourceFetcher.java:75)
at com.amazonaws.internal.EC2ResourceFetcher.readResource(EC2ResourceFetcher.java:66)
at com.amazonaws.util.EC2MetadataUtils.getItems(EC2MetadataUtils.java:403)
at com.amazonaws.util.EC2MetadataUtils.getData(EC2MetadataUtils.java:372)
at com.amazonaws.util.EC2MetadataUtils.getData(EC2MetadataUtils.java:368)
at com.amazonaws.util.EC2MetadataUtils.getEC2InstanceRegion(EC2MetadataUtils.java:283)
at com.amazonaws.regions.InstanceMetadataRegionProvider.tryDetectRegion(InstanceMetadataRegionProvider.java:59)
at com.amazonaws.regions.InstanceMetadataRegionProvider.getRegion(InstanceMetadataRegionProvider.java:50)
at com.amazonaws.regions.AwsRegionProviderChain.getRegion(AwsRegionProviderChain.java:46)
at com.amazonaws.client.builder.AwsClientBuilder.determineRegionFromRegionProvider(AwsClientBuilder.java:475)
at com.amazonaws.client.builder.AwsClientBuilder.setRegion(AwsClientBuilder.java:458)
at com.amazonaws.client.builder.AwsClientBuilder.configureMutableProperties(AwsClientBuilder.java:424)
at com.amazonaws.client.builder.AwsSyncClientBuilder.build(AwsSyncClientBuilder.java:46)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder.defaultClient(AmazonDynamoDBClientBuilder.java:53)
at com.mw.workplanningservice.util.Constants.<clinit>(Constants.java:15)
at com.mw.workplanningservice.service.EmployeeBase.saveEmployee(EmployeeBase.java:28)
at EmployeeBaseTest.saveEmployeeTest(EmployeeBaseTest.java:34)
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:628)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:171)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:167)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:114)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
Caused by: java.net.SocketTimeoutException: connect timed out
at java.base/java.net.PlainSocketImpl.waitForConnect(Native Method)
at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:107)
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
at java.base/java.net.Socket.connect(Socket.java:609)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:177)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1253)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1232)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1015)
at com.amazonaws.internal.ConnectionUtils.connectToEndpoint(ConnectionUtils.java:52)
at com.amazonaws.internal.EC2ResourceFetcher.doReadResource(EC2ResourceFetcher.java:80)
... 69 more
java.lang.ExceptionInInitializerError
at com.mw.workplanningservice.service.EmployeeBase.saveEmployee(EmployeeBase.java:28)
at EmployeeBaseTest.saveEmployeeTest(EmployeeBaseTest.java:34)
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:628)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:171)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:167)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:114)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
Caused by: com.amazonaws.SdkClientException: Unable to find a region via the region provider chain. Must provide an explicit region in the builder or setup environment to supply a region.
at com.amazonaws.client.builder.AwsClientBuilder.setRegion(AwsClientBuilder.java:462)
at com.amazonaws.client.builder.AwsClientBuilder.configureMutableProperties(AwsClientBuilder.java:424)
at com.amazonaws.client.builder.AwsSyncClientBuilder.build(AwsSyncClientBuilder.java:46)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder.defaultClient(AmazonDynamoDBClientBuilder.java:53)
at com.mw.workplanningservice.util.Constants.<clinit>(Constants.java:15)
... 53 more
Process finished with exit code -1
Code:
class EmployeeBaseTest {
#Test
void saveEmployeeTest() {
try (MockedStatic<EmployeeUtils> mockedScope = Mockito.mockStatic(EmployeeUtils.class)) {
mockedScope.when(EmployeeUtils::fetchEmployees).thenReturn(Collections.emptyList());
var response = Mockito.mock(Response.class);
var employeeBase = new EmployeeBase(response);
employeeBase.saveEmployee(new Employee());
assertEquals("TEST", response.getBody());
}
}
}

You can use Mockito#mockStatic for this.
try (MockedStatic<EmployeeUtils> mockedScope = Mockito.mockStatic(EmployeeUtils.class)) {
mockedScope.when(EmployeeUtils::fetchEmployees).thenReturn(emptyList());
// rest of your test
}

You invoke static EmployeeUtils.fetchEmployees in EmployeeBase constructor.
If you want yo have EmployeeUtils.fetchEmployees stubbed when the constructor is being run, you need to run it in scope of Mockito.mockStatic block.
class EmployeeUtilsTest {
#Test
void saveEmployeeTest() {
try (MockedStatic<EmployeeUtils> mockedScope = Mockito.mockStatic(EmployeeUtils.class)) {
mockedScope.when(EmployeeUtils::fetchEmployees).thenReturn(Collections.emptyList());
var response = Mockito.mock(Response.class);
var employeeBase = new EmployeeBase(response);
}
}
}
In particular, if you initialize the employeeBase field in the #BeforeEach method, the constructor is not run in scope of mockedStatic block.
More generally, there are a few patterns in your code which make it harder to test:
static utility classes
calling external services from constructor of the object
Rethink the design before going fancy with mockStatic

How to specify matchers in Mockito unit test for a SpringBoot based service class

I am not able to execute unit test on a service class for a Spring Boot based web application using JUnit 5 and Mockito.
Getting exception related to InvalidUseOfMatchersException.
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
AccountService.java
#Service
#Log4j2
public class AccountService {
#Autowired
private RestTemplate restTemplate;
public Account getAccount() throws Exception {
//build uri
URI uri = new URI(http://api.demo.com/api/account)
log.info("uri: " + uri);
//hit api
ResponseEntity<Account> result = this.restTemplate.getForEntity(uri, Account.class);
log.info("result: " + result);
//parse result
Account account = null;
if (result.getStatusCodeValue() == 200) {
account = result.getBody();
}
log.info("account: " + account);
return account;
}
}
AccountServiceTest.java
public class AccountServiceTest {
#InjectMocks
private AccountService instance = new AccountService();
private RestTemplate restTemplate = Mockito.mock(RestTemplate.class);
#Test
public void testGetAccount() throws Exception {
ResponseEntity<Account> result = new ResponseEntity<>(new Account(), HttpStatus.OK);
when(restTemplate.getForEntity(any(URI.class), Account.class)).thenReturn(result);
assertThat(instance.getAccount()).isNotNull();
}
}
Exception while running test
org.mockito.exceptions.misusing.InvalidUseOfMatchersException:
Invalid use of argument matchers!
2 matchers expected, 1 recorded:
-> at com.demo.service.AccountServiceTest.testGetAccount(AccountServiceTest.java:26)
This exception may occur if matchers are combined with raw values:
//incorrect:
someMethod(anyObject(), "raw String");
When using matchers, all arguments have to be provided by matchers.
For example:
//correct:
someMethod(anyObject(), eq("String by matcher"));
For more info see javadoc for Matchers class.
at com.demo.service.AccountServiceTest.testGetAccount(AccountServiceTest.java:26)
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$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$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)

It is explained in the exception message:
This exception may occur if matchers are combined with raw values:
//incorrect:
someMethod(anyObject(), "raw String");
When using matchers, all arguments have to be provided by matchers.
For example:
//correct:
someMethod(anyObject(), eq("String by matcher"));
Either avoid using matchers when calling the method of a mocked object, or use matchers for all arguments:
when(restTemplate.getForEntity(any(URI.class), eq(Account.class))).thenReturn(result);

Java Spring Boot Testing with MySQL Database

My tests for this CRUD operation in Spring Boot continue to fail where I get "java.util.NoSuchElementException: No Value Present" I understand that testCreateDemographic is creating a record, however, testFindDemographicsById is not able to find the newly created record because it is using "1L" in findById(1L) to find a record. How do I get the correct new related record Id to place in findById() argument?
package com.lizardkinghotel.demographic;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.lizardkinghotel.demographic.entities.DemographicEntity;
import com.lizardkinghotel.demographic.repos.DemographicRepository;
#SpringBootTest
class DemographicAppApplicationTests {
#Autowired
private DemographicRepository demoRepo;
#Test
public void testCreateDemographic() {
DemographicEntity demoEntity = new DemographicEntity();
//demoEntity.setId(1L);
demoEntity.setAge("39–47");
demoEntity.setChildren(2);
demoEntity.setCity("san jose");;
demoEntity.setCountry("costa rica");
demoEntity.setEducation("bacherlors degree");
demoEntity.setEmail("test#test.com");
demoEntity.setEmployment("yes");
demoEntity.setGender("male");
demoEntity.setGuestAmount(2);
demoEntity.setHearAbout("google search");
demoRepo.save(demoEntity);
}
#Test
public void testFindDemographicsById() {
DemographicEntity demoEntity = demoRepo.findById(1L).get();
}
//testing updating a record
#Test
public void testUpdateDemo() {
DemographicEntity demoEntity = demoRepo.findById(1L).get();
demoRepo.save(demoEntity);
}
#Test
public void testDeleteDemo() {
DemographicEntity demoEntity = demoRepo.findById(1L).get();
demoRepo.delete(demoEntity);
}
}
Below is my error:
java.util.NoSuchElementException: No value present
at java.util.Optional.get(Optional.java:135)
at com.lizardkinghotel.demographic.DemographicAppApplicationTests.testFindDemographicsById(DemographicAppApplicationTests.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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:98)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)

JUnit test should not depend on the other. Which means change your findById test to something like this:
#Test
public void testFindDemographicsById() {
DemographicEntity demoEntity = new DemographicEntity();
demoEntity.setAge("39–47");
demoEntity.setChildren(2);
demoEntity.setCity("san jose");;
demoEntity.setCountry("costa rica");
demoEntity.setEducation("bacherlors degree");
demoEntity.setEmail("test#test.com");
demoEntity.setEmployment("yes");
demoEntity.setGender("male");
demoEntity.setGuestAmount(2);
demoEntity.setHearAbout("google search");
DemographicEntity saved = demoRepo.save(demoEntity);
DemographicEntity demoEntity = demoRepo.findById(saved.getId()).get();
}