passing program arguments to spring boot - spring-boot

Question

I have a spring boot batch application which use program arguments to get some files and manipulate it. the app works fine but i have problems when running the junit tests.
Here is my code :
#Component
public class ApplicationArguments implements InitializingBean {
#Autowired private org.springframework.boot.ApplicationArguments appArgs;
private String filePath;
#Override
public void afterPropertiesSet() throws Exception {
filePath = appArgs.getSourceArgs()[0];
}
}
this bean is used by another one to build the full path :
#Component
public class InitPaths implements InitializingBean {
#Autowired private ApplicationArguments myAppArgs;
private String fullPath;
#Override
public void afterPropertiesSet() throws Exception {
fullPath = myAppArgs.getFilePath(); //this will be null when launching tests
fullPath.toString();//this will throw a NullPointerException if we run the test
}
}
the application works fine using this command :
java -jar myApp.jar fileName.txt
is there any solution to pass the same argument to the junit test ?
I tried to use mocks but i had the same issue :
#RunWith(SpringRunner.class)
#SpringBootTest
public class BatchTest {
#MockBean
ApplicationArguments applicationArguments;
#Autowired
#InjectMocks
InitPaths initPaths;
#Before
public void before() {
when(applicationArguments.getFilePath()).thenReturn("myCustomFile.dat");
}
#Test
public void contextLoad() {
}
}
Here is the error :
Invocation of init method failed; nested exception is java.lang.NullPointerException

Answer 1

The problem is because method afterPropertiesSet() in InitPaths have been running a earlier them before in test. Thats mean your mocked ApplicationArguments do not have any mocked behavior. From my perspective you might create new mocked ApplicationArguments with predefined behavior
#RunWith(SpringRunner.class)
#SpringBootTest
#Import(ApplicationArgumentsTestConfig.class)
public class BatchTest {
#Autowired
InitPaths initPaths;
#Test
public void contextLoad() {
}
public static class ApplicationArgumentsTestConfig {
#Bean
#Primary
public ApplicationArguments mockArg() {
ApplicationArguments mocked = Mockito.mock(ApplicationArguments.class);
Mockito.when(mocked.getFilePath()).thenReturn("test-mock-path");
return mocked;
}
}
}
I just checked work for me.