InvalidStateDetectionTest.java

/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.*;

import org.junit.After;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.StateMaster;
import org.mockito.exceptions.misusing.InvalidUseOfMatchersException;
import org.mockito.exceptions.misusing.UnfinishedStubbingException;
import org.mockito.exceptions.misusing.UnfinishedVerificationException;
import org.mockitousage.IMethods;
import org.mockitoutil.TestBase;

/**
 * invalid state happens if:
 *
 *    -unfinished stubbing
 *    -unfinished doReturn()
 *    -stubbing without actual method call
 *    -verify without actual method call
 *
 * we should aim to detect invalid state in following scenarios:
 *
 *    -on method call on mock
 *    -on verify
 *    -on verifyZeroInteractions
 *    -on verifyNoMoreInteractions
 *    -on verify in order
 *    -on stub
 */
@SuppressWarnings({"unchecked", "deprecation"})
public class InvalidStateDetectionTest extends TestBase {

    @Mock private IMethods mock;

    @After
    public void resetState() {
        super.resetState();
    }

    @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
    @Test
    public void shouldDetectUnfinishedStubbing() {
        when(mock.simpleMethod());
        detectsAndCleansUp(new OnMethodCallOnMock(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnStub(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnVerify(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnVerifyInOrder(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnVerifyZeroInteractions(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnVerifyNoMoreInteractions(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnVerifyNoInteractions(), UnfinishedStubbingException.class);

        when(mock.simpleMethod());
        detectsAndCleansUp(new OnDoAnswer(), UnfinishedStubbingException.class);
    }

    @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
    @Test
    public void shouldDetectUnfinishedDoAnswerStubbing() {
        doAnswer(null);
        detectsAndCleansUp(new OnMethodCallOnMock(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnStub(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnVerify(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnVerifyInOrder(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnVerifyZeroInteractions(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnVerifyNoMoreInteractions(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnVerifyNoInteractions(), UnfinishedStubbingException.class);

        doAnswer(null);
        detectsAndCleansUp(new OnDoAnswer(), UnfinishedStubbingException.class);
    }

    @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
    @Test
    public void shouldDetectUnfinishedVerification() {
        verify(mock);
        detectsAndCleansUp(new OnStub(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnVerify(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnVerifyInOrder(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnVerifyZeroInteractions(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnVerifyNoMoreInteractions(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnVerifyNoInteractions(), UnfinishedVerificationException.class);

        verify(mock);
        detectsAndCleansUp(new OnDoAnswer(), UnfinishedVerificationException.class);
    }

    @Test
    public void shouldDetectMisplacedArgumentMatcher() {
        anyObject();
        detectsAndCleansUp(new OnVerify(), InvalidUseOfMatchersException.class);

        anyObject();
        detectsAndCleansUp(new OnVerifyInOrder(), InvalidUseOfMatchersException.class);

        anyObject();
        detectsAndCleansUp(new OnVerifyZeroInteractions(), InvalidUseOfMatchersException.class);

        anyObject();
        detectsAndCleansUp(new OnVerifyNoMoreInteractions(), InvalidUseOfMatchersException.class);

        anyObject();
        detectsAndCleansUp(new OnVerifyNoInteractions(), InvalidUseOfMatchersException.class);

        anyObject();
        detectsAndCleansUp(new OnDoAnswer(), InvalidUseOfMatchersException.class);
    }

    @Test
    public void shouldCorrectStateAfterDetectingUnfinishedStubbing() {
        doThrow(new RuntimeException()).when(mock);

        try {
            doThrow(new RuntimeException()).when(mock).oneArg(true);
            fail();
        } catch (UnfinishedStubbingException e) {}

        doThrow(new RuntimeException()).when(mock).oneArg(true);
        try {
            mock.oneArg(true);
            fail();
        } catch (RuntimeException e) {}
    }

    @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
    @Test
    public void shouldCorrectStateAfterDetectingUnfinishedVerification() {
        mock.simpleMethod();
        verify(mock);

        try {
            verify(mock).simpleMethod();
            fail();
        } catch (UnfinishedVerificationException e) {}

        verify(mock).simpleMethod();
    }

    private interface DetectsInvalidState {
        void detect(IMethods mock);
    }

    private static class OnVerify implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            verify(mock);
        }
    }

    private static class OnVerifyInOrder implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            inOrder(mock).verify(mock);
        }
    }

    private static class OnVerifyZeroInteractions implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            verifyZeroInteractions(mock);
        }
    }

    private static class OnVerifyNoMoreInteractions implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            verifyNoMoreInteractions(mock);
        }
    }

    private static class OnVerifyNoInteractions implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            verifyNoInteractions(mock);
        }
    }

    private static class OnDoAnswer implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            doAnswer(null);
        }
    }

    private static class OnStub implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            when(mock);
        }
    }

    private static class OnMethodCallOnMock implements DetectsInvalidState {
        public void detect(IMethods mock) {
            mock.simpleMethod();
        }
    }

    private static class OnMockCreation implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            mock(IMethods.class);
        }
    }

    private static class OnSpyCreation implements DetectsInvalidState {
        @SuppressWarnings({"CheckReturnValue", "MockitoUsage"})
        public void detect(IMethods mock) {
            spy(new Object());
        }
    }

    private void detectsAndCleansUp(DetectsInvalidState detector, Class<?> expected) {
        try {
            detector.detect(mock);
            fail("Should throw an exception");
        } catch (Exception e) {
            assertEquals(expected, e.getClass());
        }
        //Make sure state is cleaned up
        new StateMaster().validate();
    }
}