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PowerMock学习

Posted on Edited on In Valine:

PowerMock 学习研究

  • 添加maven依赖

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    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <version>${spring.boot.version}</version>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-api-mockito2</artifactId>
      <version>2.0.7</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>2.0.7</version>
      <scope>test</scope>
    </dependency>

非spring环境的mock测试

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@RunWith(PowerMockRunner.class)//等效 在@Before方法中加MockitoAnnotations.initMocks(this);
@PrepareForTest(SampleUtil.class)
public class UnitTestWithOutSpring {
    /**
     * 被测试服务
     */
    @InjectMocks
    private ServerConfig serverConfig;

    @Before
    public void beforeInit() throws IllegalAccessException {
        System.out.println("before logic ");
        serverConfig = new ServerConfig();
        serverConfig.setHost("127.0.0.1");
        System.out.println(serverConfig.getHost());
        serverConfig.setHost("localhost");

        mockStatic(SampleUtil.class);//mock 静态方法
        when(SampleUtil.staticMethod()).thenReturn("static");

    }

    @After
    public void after() throws Exception {
        System.out.println("after logic ...");
    }

    @Test
    @DisplayName("名字configTest...")
    public void configTest() {
        assertNotNull(serverConfig);
        assertEquals("localhost", serverConfig.getHost());
    }
}

含有spring环境的mock测试

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@ExtendWith(SpringExtension.class)
@RunWith(PowerMockRunner.class)
//@PowerMockRunnerDelegate(SpringRunner.class)
@SpringBootTest(classes = ServerConfig.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@PowerMockIgnore("javax.management.*")
@DisplayName("testName")
public class UnitTestWithSpring {
    @Autowired
    @InjectMocks
    private ServerConfig serverConfig;


    @Before
    public void beforeTest() {
//        System.out.println(serverConfig.getHost());
    }

    @DisplayName("ip测试")
    @Test
    public void doTest() {
        Assert.assertEquals("127.0.0.1", serverConfig.getHost());
    }
}

如何mock静态方法

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mockStatic(SampleUtil.class);//mock 静态方法
when(SampleUtil.staticMethod()).thenReturn("static");

如何mock私有方法

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@Test
public void testPrivate() throws IllegalAccessException {
  //模拟私有字段mock
  // 类实例（class instance）
  PrivateObject instance = new PrivateObject("private");

  // 模拟私有字段/变量（private field/variable）
  MemberModifier
    .field(PrivateObject.class, "privateString").set(instance, "hello mock private");

  // 模拟私有方法（private method）
  MemberModifier
    .stub(MemberMatcher.method(PrivateObject.class, "getPrivateString"))
    .toReturn("Power Mock");
  System.out.println(instance.doTest());
}