Mockテスト

import static org.mockito.BDDMockito.*;

import javax.persistence.EntityTransaction;

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

import xx.domain.User;
import xx.domain.UserService;

public class Test {

    private static final long EXPECTED_ID = 12345;
    @Mock
    private UserService userService;

    @Mock
    private EntityTransaction mockTransaction;

    private User user;

    private User result;

    @Before
    public void init() {
        MockitoAnnotations.initMocks(this);
        user = new User();
        user.setId(EXPECTED_ID);
        testInstance = new UserServiceImpl(mockService);
    }

    @Test
    public void testSearchById() {
        givenUserToSearch();
        whenSearch();
        thenVerifyResult();
    }

    private void whenSearch() {
        result = testInstance.searchById(12345);
    }

    @Test
    public void testSaveUser() {
        givenClaimApplicationToSave();
        whenSave();
        thenVerifyResult();
    }

    private void givenUserToSearch() {
        given(mockService.find(EXPECTED_ID)).willReturn(user);
    }

    private void thenVerifyResult() {
        Assert.assertEquals(EXPECTED_ID, result.getId());
    }

    private void whenSave() {
        result = testInstance.saveUser(user);
    }

    private void givenUserToSave() {
        given(mockService.startNewTransaction()).willReturn(mockTransaction);
        given(mockService.saveUser(user)).willReturn(user);
    }
}