Best Mockito code snippet using org.mockito.internal.configuration.ClassPathLoaderTest.answer
Source: ClassPathLoaderTest.java
...9public class ClassPathLoaderTest extends TestBase {10 @Test11 public void shouldReadConfigurationClassFromClassPath() {12 ConfigurationAccess.getConfig().overrideDefaultAnswer(new Answer<Object>() {13 public Object answer(InvocationOnMock invocation) {14 return "foo";15 }});16 IMethods mock = mock(IMethods.class);17 assertEquals("foo", mock.simpleMethod());18 }19}...
answer
Using AI Code Generation
1org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)2org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)3org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)4org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)5org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)6org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)7org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)8org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)9org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)10org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)11org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)12org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)13org.mockito.internal.configuration.ClassPathLoaderTest.answer(org.mockito.internal.configuration.ClassPathLoaderTest.java:111)
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There are a couple things you seem to have crossed up in your test. There are integration tests and unit tests. Integration tests will test everything (or almost everything) all hooked up - so you use Spring configuration files very close to the real ones and real examples of objects get injected to your class under test. That's mostly what I use @ContextConfiguration
but I use that in conjunction with @RunWith(SpringJUnit4ClassRunner.class)
If you are using Mockito (or any mocking framework), it is usually because you want to isolate the class you are testing from real implementations of other classes. So instead of, for example, having to contrive a way to get your RegistrationService to throw a NumberFormatException to test that code path, you just tell the mock RegistrationService to do it. There are lots of other examples where it is more convenient to use mocks than to use real class instances.
So, that mini-lesson finished. Here is how I would re-write your test class (with an extra example and commented along the way).
@RunWith(MockitoJUnitRunner.class)
public class RegistrationControllerTest {
// Create an instance of what you are going to test.
// When using the @InjectMocks annotation, you must create the instance in
// the constructor or in the field declaration.
@InjectMocks
private RegistrationController controllerUT = new RegistrationController();
// The @Mock annotation creates the mock instance of the class and
// automatically injects into the object annotated with @InjectMocks (if
// possible).
@Mock
private RegistrationService registrationService;
// This @Mock annotation simply creates a mock instance. There is nowhere to
// inject it. Depending on the particular circumstance, it may be better or
// clearer to instantiate the mock explicitly in the test itself, but we're
// doing it here for illustration. Also, I don't know what your real class
// is like, but it may be more appropriate to just instantiate a real one
// than a mock one.
@Mock
private ModelMap model;
// Same as above
@Mock
private BulkRegistration bulkRegistration;
// Same as above
@Mock
private FileData fileData;
@Before
public void setUp() {
// We want to make sure that when we call getFileData(), it returns
// something non-null, so we return the mock of fileData.
when(bulkRegistration.getFileData()).thenReturn(fileData);
}
/**
* This test very narrowly tests the correct next page. That is why there is
* so little expectation setting on the mocks. If you want to test other
* things, such as behavior when you get an exception or having the expected
* filename, you would write other tests.
*/
@Test
public void testCreate() throws Exception {
final String target = "bulkRegistration";
// Here we create a default instance of BindingResult. You don't need to
// mock everything.
BindingResult result = new BindingResult();
String nextPage = null;
// Perform the action
nextPage = controllerUT.create(bulkRegistration, result, model);
// Assert the result. This test fails, but it's for the right reason -
// you expect "bulkRegistration", but you get "registration".
assertEquals("Controller is not requesting the correct form", nextPage,
target);
}
/**
* Here is a simple example to simulate an exception being thrown by one of
* the collaborators.
*
* @throws Exception
*/
@Test(expected = NumberFormatException.class)
public void testCreateWithNumberFormatException() throws Exception {
doThrow(new NumberFormatException()).when(registrationService)
.processFile(any(File.class), anyList());
BindingResult result = new BindingResult();
// Perform the action
controllerUT.create(bulkRegistration, result, model);
}
}
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