2. 开启Mock的三种方式、深度Mook

package lesson3;

import common.Account;
import common.AccountDao;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.mockito.runners.MockitoJUnitRunner;
import static org.mockito.Mockito.mock;

@RunWith(MockitoJUnitRunner.class)
public class _1_MockByRunnerTest {
    @Test
    public void testMock() {
//        AccountDao accountDao = mock(AccountDao.class);
        AccountDao accountDao = mock(AccountDao.class, Mockito.RETURNS_SMART_NULLS);
        Account account = accountDao.getAccount("x", "x");
        System.out.println(account);
    }
}

package lesson3;

import common.Account;
import common.AccountDao;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Answers;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

public class _2_MockByAnnotationTest {
    /**
     * set param on annotation, replace on mock() method
     */
    @Mock(answer = Answers.RETURNS_SMART_NULLS)
    private AccountDao accountDao;

    /**
     * replace @RunWith(MockitoJUnitRunner.class)
     */
    @Before
    public void init() {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void testMock() {
        Account account = accountDao.getAccount("x", "x");
        System.out.println(account);
    }
}

package lesson3;

import common.Account;
import common.AccountDao;
import org.junit.Rule;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;

public class _3_MockByRuleTest {

    @Rule
    public MockitoRule mockitoRule = MockitoJUnit.rule();

    @Mock
    AccountDao accountDao;

    @Test
    public void testMock() {
        Account account = accountDao.getAccount("x", "x");
        System.out.println(account);
    }
}

package lesson3;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Answers;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

public class _4_DeepMockTest {
    @Before
    public void init() {
        MockitoAnnotations.initMocks(this);
    }

    /**
     * without "answer = Answers.RETURNS_DEEP_STUBS", lesson3.foo() will throw NullPointException
     */
    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
    Lesson3Service lesson3Service;

    @Test
    public void testDeepMock() {
        lesson3Service.getLesson3().foo();

        Lesson3 lesson3 = lesson3Service.getLesson3();
        String foo = lesson3.foo();
        Assert.assertEquals(true, lesson3 != null);
        Assert.assertEquals(true, foo == null);
    }

}

public class Lesson3 {
    public String foo() {
        throw new RuntimeException();
    }
}

package lesson3;

public class Lesson3Service {
    public Lesson3 getLesson3() {
        throw new RuntimeException();
    }
}