How to use should_throw_illegal_state_exception_if_null_answer method of org.mockito.internal.stubbing.answers.ThrowsExceptionTest class

Best Mockito code snippet using org.mockito.internal.stubbing.answers.ThrowsExceptionTest.should_throw_illegal_state_exception_if_null_answer

Source:ThrowsExceptionTest.java Github

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...57 } catch (MockitoException expected) {58 }59 }60 @Test61 public void should_throw_illegal_state_exception_if_null_answer() throws Throwable {62 Invocation invocation = ThrowsExceptionTest.createMethodInvocation();63 try {64 new ThrowsException(null).answer(invocation);65 TestCase.fail();66 } catch (IllegalStateException expected) {67 }68 }69 @Test70 public void should_pass_proper_checked_exception() throws Throwable {71 new ThrowsException(new CharacterCodingException()).validateFor(ThrowsExceptionTest.createMethodInvocation());72 }73 @Test(expected = MockitoException.class)74 public void should_fail_invalid_checked_exception() throws Throwable {75 new ThrowsException(new IOException()).validateFor(ThrowsExceptionTest.createMethodInvocation());...

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should_throw_illegal_state_exception_if_null_answer

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1package org.mockito.internal.stubbing.answers;2import java.util.*;3import org.mockito.*;4import org.mockito.internal.stubbing.answers.*;5import static org.mockito.Mockito.*;6import static org.mockito.Matchers.*;7import static org.mockito.BDDMockito.*;8public class ThrowsExceptionTest {9 public void should_throw_illegal_state_exception_if_null_answer() {10 ThrowsException answer = new ThrowsException(null);11 answer.answer(null);12 }13}14package org.mockito.internal.stubbing.answers;15import java.util.*;16import org.mockito.*;17import org.mockito.internal.stubbing.answers.*;18import static org.mockito.Mockito.*;19import static org.mockito.Matchers.*;20import static org.mockito.BDDMockito.*;21public class ThrowsExceptionTest {22 public void should_throw_illegal_state_exception_if_null_answer() {23 ThrowsException answer = new ThrowsException(null);24 answer.answer(null);25 }26}

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Questions
Discussion

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Throw a RuntimeException when invoking an unstubbed method

You are misunderstanding what a mock is.

When you are mocking MyClass1, the inner field of type MyInnerClass doesn't exist anymore for the mocked object. As such, it doesn't make sense to try to inject something into a mock.

A mock is controlled by saying what it should do when you interact with it. You stub its public methods to do what you want them to do. You give behaviour. The only default behaviour (maybe specific to Mockito) is to return null if you didn't configure the mock (but do note that it doesn't return null because some internal variable is null, it returns that because Mockito decided that that's what it should return; maybe another mocking framework decided that it should throw an exception instead, who knows?).

As an example, consider that your real class is:

class MyClass1 {
    private MyInnerClass myInnerClass;
    public MyInnerClass getMyInnerClass() {
        return myInnerClass;
    }
}

Now consider mock a mock of that class. If you call mock.getMyInnerClass(), it is not the real method that is going to be called. What it will return is not the value of myInnerClass. It will return null, or if you have stubbed that method with

when(mock.getMyInnerClass()).thenReturn(something);

then it will return something.

So to answer your question: you can't do that because that's not how mocks work.

https://stackoverflow.com/questions/34635665/how-to-inject-mocked-object-into-another-already-mocked-object

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