I have a spring boot application, I want to write a junit test cases for the void method, So I just want test whether the log contains the particular messages.
Following is my business logic class:
public void processAdjustmentFeed(){
............
if(!CollectionUtils.isEmpty(adjustmentList)){
log.info("ADJUSTMENT FEED SIZE TO PUBLISH: {}", adjustmentList.size());
// SOME BUSINESS LOGIC
} else {
log.warn("NO ADJUSTMENT FEED FOUND TO PROCESS FROM : {}", lastSuccessfulQueriedTimeStamp);
}
}
And in my test class:
#RunWith(SpringRunner.class)
#SpringBootTest
public class AdjustmentSchedulerTest {
//
#Autowired
private AdjustmentScheduler adjustmentScheduler;
#Autowired
private AdjustmentRepository adjustmentRepository;
#Autowired
private AdjustmentService adjustmentService;
#Test
public void processAdjustmentFeed_ValidAdjustmentList()
{
....
adjustmentScheduler.processAdjustmentFeed();
//HERE I NEED TO CHECK FOR THE LOG MESSAGE
}
}
How can I do it without using mockito, because am using H2 database ,I want to have a test with actual method. Can anyone please provide me some code samples to do it.
You should focus on testing // SOME BUSINESS LOGIC instead of logger. Testing logs makes your test tightly coupled and you end up testing already tested logger code. This doesn't complies with unit testing principles.
Anyway if you really don't want to use mockito, you can always write your own appender where log messages go through.
See this for example.
I'm trying to test a spring batch job that performs a read (get data from another application) process (simple calculation) and write (into the mongodb)
the reader is #StepScope
here is the postConstruct of the read task.
#PostConstruct
public void init(){
employees.addAll(getListOfEmployeesBy(affectationMotifService.findAllRegistrationNumbers()));
}
public List<EmployeeForSalaryDTO> getListOfEmployeesBy(List<String> registrationNumbers){
LOG.debug("request to get all the employees by registration numbers {}" , registrationNumbers);
return coreResourceFeign.getAllEmployeesForSalaryByRegistrationNumbers(registrationNumbers).getBody();
}
When I try to launch the test of the job or what ever test in the application. spring always runs the init() of the read task .. which will fail the test because I need to mock the coreResourceFeign.getAllEmployeesForSalaryByRegistrationNumbers(registrationNumbers) .
I can't mock the method because it runs before the test begin.
here is the test
#RunWith(SpringRunner.class)
#SpringBootTest(classes = {SalaryApp.class, SecurityBeanOverrideConfiguration.class})
public class SalaryJobServiceTest {
#Autowired
#InjectMocks
private SalaryJobService salaryJobService;
#Test
public void startJob() throws Exception {
SalaryJobDTO SalaryJobDTO = salaryJobService.start(Collections.emptyList());
Assert.assertNotNull(salaryJobDTO.getId());
}
}
I have no idea how to deal with spring batch tests. Any recommendation or help will be welcomed.
#PostConstruct will make sure your method is called immediately after the object is created. Spring application creates all the beans as per the configs while application start. This is expected behavior. If you do not want to call your method during application start up remove #PostConstruct and you can run your test mocking the dependent objects.
Rather you should use readers read method to load your data to the reader.
In what circumstances CommandLineRunner is preferred instead of writing additional code in the main method of SpringBoot application.
I understand that CommandLineRunner gets executed before main gets completed.
In simple cases, there is no difference.
But if the code need to access features provided by spring, such as ioc or only interface repositories/services, you need to wait for the complete application startup. And the call of the overrided run method after completion is garanteed.
Besides, CommandLineRunner has other advantages:
Can be implemented multiple times
The capability to start any scheduler or log any message before application starts to run
I have used it to decouple code. Instead of placing a bunch of code into main method, the CommandLineRunner lets you distribute it more evenly around the codebase. It really depends on what kind of flags you are passing in and why you need to pass them in. Spring offers a lot of flexibility for you to get the job done in the easiest way.
For a full on command line tool, you can decouple initialization and config a little bit by dividing your code between init and core behavior.
A spring boot server can overwrite configuration based on args passed in from the command line.
I would suggest all time time. It adds a lot of flexibility to your "bootstrapping code".
1) For example, command line runners are spring #Beans, so you can activate/deactivate them at run-time.
2) You can use them in an ordered fashion by appending the #Order annotation
3) You can unit test them just like regular classes
4) You can inject dependencies into them. Each runner can then have its own dependencies.
All of the above are more difficult, if not impossible to achieve if you add all your bootstrapping logic in the main() method of the Spring Application class.
Hope my answer helps,
Cheers
I haven't found any good reason for using it over just writing code after starting the application.
The only thing I can think of is that the command line runners are called before any SpringApplicationRunListeners have #finished called.
I have seen people use them to perform main application logic, but I think this is an antipattern.
One of the annoying things about doing so is that the application start timer is still running and when the task completes you will see a log entry like Started DemoApplication in 5.626 seconds (JVM running for 0.968).
It's confusing to see a message about your application starting despite, in reality it having just finished.
I encountered a scenario where i had to keep a certain data from the db loaded into the cache before the method was hit from the controller end point the first time. In this scenario it was desirable to hit the method for populating the cache using the run method after extending CommandLineRunner class so that before the application even starts up the data is already available in the cache.
I use this to populate my Default Data. I usually create ApplicationInitializer class that extends CommandLineRunner.
I have methods like createDefaultUser(), createDefaultSytemData() etc.
This way I do not rely on sql files to populate database for me. :)
ApplicationRunner and CommandLineRunner:
two of them can execute some custom code before your application finished starting up.
ComandLineRunner:
#Component
public class CommandLineAppStartupRunner implements CommandLineRunner {
private static final Logger logger = LoggerFactory.getLogger(CommandLineAppStartupRunner.class);
#Override
public void run(String...args) throws Exception {
logger.info(Arrays.toString(args));
}
}
you can get the args directly
ApplicationRunner：
#Component
public class AppStartupRunner implements ApplicationRunner {
private static final Logger logger = LoggerFactory.getLogger(AppStartupRunner.class);
#Override
public void run(ApplicationArguments args) throws Exception {
logger.info(args.getOptionNames());
}
}
ApplicationRunner has many methods to get params
ComandLineRunner can get params directly
if you custom two runner class, you can use annotation #Order to Specify the order of execution
public class Phone {
#Autowired
BeanExample beanExample;
public void print(){
beanExample.fn();
}
}
public class BeansCreatorClass {
#Bean
public BeanExample getBeanExample(){
return new BeanExample();
}
#Bean
public Phone getPhone(){
return new Phone();
}
}
#SpringBootApplication
public class SpringBootRunnerConfigurationPropertiesApplication implements CommandLineRunner, ApplicationRunner {
public static void main(String[] args){
SpringApplication.run(SpringBootRunnerConfigurationPropertiesApplication.class, args);
System.out.println("==== spring boot commandLine is running === ");
// beans creator class is the class contains all beans needed
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(BeansCreatorClass.class);
Phone phone = applicationContext.getBean(Phone.class);
phone.print();
}
// commandLineRunner
public void run(String... args) throws Exception {
System.out.println("=== commandLine Runner is here ==== ");
}
// application runner
#Override
public void run(ApplicationArguments args) throws Exception {
System.out.println("=== application runner is here ====");
}
}
I mostly use CommandLineRunner to:
Apply initial migrations
Run a code that is independent of REST/SOAP calls.
i have a spring boot application. sometimes i need to launch long running report generation. the easiest way was to create an #IntegrationTest to use spring's #Autowire:
#RunWith(SpringJUnit4ClassRunner.class)
#WebAppConfiguration
#SpringApplicationConfiguration(classes=Application.class)
#IntegrationTest
public class ReportGenerationTest {
#Autowired MyService myService;
#Value("classpath:/test.txt") Resource testData; //it's in test, not in src
#Test
public void generate_report() {
report(myService, testData);
}
}
it works perfectly. but i don't want it to be run with every build. i also don't want to add/remove #Ignore as sooner or later someone will accidentally commit it without #Ignore and i don't want to do any code editing just to run reports
ideally i would like it to be a main method run on demand. but how can i manually create a spring context for the src service and test resources?
i need something like:
public class MyReport {
public static void main(String[] args) {
ReportGenerationTest reportGenerator = getAutowiredInstanceFromSpring();
reportGenerator.generate_report();
}
}
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration(locations={"/applicationContext-test.xml"})
#Transactional
public class MyServiceTest {
#Resource(name="myService")
public MyService myService;
#Test
public void testSeomthing() {
//do some asserts using myService.whatever()
}
}
However the tests are based on data I migrate in, so every time I run my suite of tests I want to execute my unrelated migration code. I don't want to run a #Before in each test class. I want to run it once at beginning of complete test process, where can I put this ?
I would advice you to create a test bean somewhere with startup logic invoked in #PostConstruct:
#Service
public class TestBean {
#PostConstruct
public void init() {
//startup logic here
}
}
Obviously this bean should only be created for tests, the easiest way to achieve this is to place it in src/test/java in a package that is component-scanned by Spring for #Service-annotated classes.
Note: you must remember that #PostConstruct is not running in a transaction! See How to call method on spring proxy once initialised.
JUnit also offers a #BeforeClass annotation which you can place on a static method to initialize resources just once.