PowerMock + Emma-私有静态方法和其他方法的代码覆盖率显示0%

时间:2018-08-28 18:20:49

标签: java powermock powermockito

我从Mock private method using PowerMockito中引用了PowerMock,并在此处应用了相同的逻辑。另外,我在eclipse / STS中安装了EMMA(开源工具),但是当我运行代码时,看到的代码覆盖率为零。为什么?

public class MyClient {

    public void publicApi() {
        System.out.println("In publicApi");
        int result = 0;
        try {
            result = privateApi("hello", 1);
        } catch (Exception e) {
            //Assert.fail();
        }
        System.out.println("result : "+result);
        if (result == 20) {
            throw new RuntimeException("boom");
        }
    }

    private static int privateApi(String whatever, int num) throws Exception {
        System.out.println("In privateAPI");
        thirdPartyCall();
        int resp = 10;
        return resp;
    }

    private static void thirdPartyCall() throws Exception{
        System.out.println("In thirdPartyCall");
        //Actual WS call which may be down while running the test cases
    }
}

MyClientTest.java

@RunWith(PowerMockRunner.class)
@PrepareForTest(MyClient.class)
public class MyClientTest {

    @Test
    public void testPublicAPI() throws Exception {
        PowerMockito.mockStatic(MyClient.class);

        //PowerMockito.doReturn(10).when(MyClient.class, "privateApi", anyString(), anyInt());
        PowerMockito.when(MyClient.class,"privateApi", anyString(), anyInt()).thenReturn(anyInt());
    }
}

实际代码覆盖率: enter image description here

pom.xml

<dependencies>
        <!-- Power Mock -->
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>1.7.4</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>1.7.4</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4-rule-agent</artifactId>
            <version>1.7.4</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-core</artifactId>
            <version>1.7.4</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

1 个答案:

答案 0 :(得分:0)

如果您要构建间谍程序或模拟程序,则不是在调用测试中的实际代码。间谍的重点是能够verify()进行间谍活动,以便通过调用正确的回调或方法来检查代码是否正确运行。对于模拟,关键是将代码引导到特定的控制流路径,并verify()与模拟进行预期的交互。

由于您的测试用例在一个间谍上调用了测试方法,因此也就不足为奇了,您的代码覆盖率恰好是0%。如果要验证与嘲笑方法的交互,您可能会发现没有任何反应。

您要做的是设置模拟程序,但以“正常方式”调用测试中的实际代码。想法是准备执行环境,然后“正常”调用经过测试的方法,最后观察实际发生的情况。最后一点包括对产生的输出的常规断言,预期交互的验证(既发生了交互,又涉及预期的参数/值)。

更改测试代码:

MyClient classUnderTest = PowerMockito.spy(new MyClient());

收件人:

MyClient classUnderTest = new MyClient();

并观看代码覆盖范围。