PowerMockito.whenNew() 适用于 Junit 测试，但不适用于 TestNg 测试

Question

我正在使用 TestNG 对我的应用程序进行单元测试和模拟。

我的问题是，当我在ClassA中使用PowerMockito.whenNew(ClassB.class)方法和debug时，发现objB是原来没有mocked的。
经过多次调查，我使用了

导入 org.junit.Test;

而不是

导入 org.testng.annotations.Test；

并尝试使用 Junit 测试而不是 TestNG。 令人惊讶的是，它使用 JUnit(666) 返回了预期值，但使用 TestNG 返回了 (15)，这不是预期的。

所有的类和pom文件都在下面

package unit.test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.testng.annotations.Test;

@RunWith(PowerMockRunner.class)
@PrepareForTest({ ClassA.class, ClassB.class })
public class App {
    @Test
    public void shoudlReturn666() throws Exception {
        ClassB mockB = PowerMockito.mock(ClassB.class);
        PowerMockito.when(mockB.get15()).thenReturn(666);
        PowerMockito.whenNew(ClassB.class).withNoArguments().thenReturn(mockB);
        Assert.assertTrue(new ClassA().callB() == 666);
    }
}

A类--

package unit.test;
public class ClassA {
    public int callB() {
        ClassB objB = new ClassB();
        return objB.get15();
    }
}

B类--

package unit.test;
public class ClassB {
    public int get15() {
        return 15;
    }
}

Pom 文件

<dependencies>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.10.19</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-mockito-release-full</artifactId>
            <version>1.6.4</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>1.5</version>
            <scope>test</scope>
        </dependency>
</dependencies>

结果是：

                [TestNG] Running:
              C:\Users\Wael Elkholy\AppData\Local\Temp\testng-eclipse--514551319\testng-customsuite.xml

            FAILED: shoudlReturnTheCValue
            junit.framework.AssertionFailedError: null
                at junit.framework.Assert.fail(Assert.java:47)
                at junit.framework.Assert.assertTrue(Assert.java:20)
                at junit.framework.Assert.assertTrue(Assert.java:27)
                at unit.test.App.shoudlReturnTheCValue(App.java:17)
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
                at java.lang.reflect.Method.invoke(Unknown Source)
                at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
                at org.testng.internal.Invoker.invokeMethod(Invoker.java:696)
                at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:882)
                at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1189)
                at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
                at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
                at org.testng.TestRunner.privateRun(TestRunner.java:767)
                at org.testng.TestRunner.run(TestRunner.java:617)
                at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
                at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:343)
                at org.testng.SuiteRunner.privateRun(SuiteRunner.java:305)
                at org.testng.SuiteRunner.run(SuiteRunner.java:254)
                at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
                at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
                at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
                at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
                at org.testng.TestNG.run(TestNG.java:1057)
                at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
                at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
                at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)


            ===============================================
                Default test
                Tests run: 1, Failures: 1, Skips: 0
            ===============================================


            ===============================================
            Default suite
            Total tests run: 1, Failures: 1, Skips: 0
            ===============================================

            [TestNG] Time taken by org.testng.reporters.XMLReporter@2752f6e2: 59 ms
            [TestNG] Time taken by org.testng.reporters.EmailableReporter2@48140564: 20 ms
            [TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@c818063: 65 ms
            [TestNG] Time taken by org.testng.reporters.jq.Main@7dc36524: 127 ms
            [TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 18 ms
            [TestNG] Time taken by org.testng.reporters.JUnitReportReporter@2133c8f8: 18 ms

我的代码有问题吗？

Answer 1

据the PowerMock documentation：

@PrepareForTest({ ClassA.class, ClassB.class })
public class App extends PowerMockTestCase {
    @Test
    public void shoudlReturn666() throws Exception {
        ClassB mockB = PowerMockito.mock(ClassB.class);
        PowerMockito.when(mockB.get15()).thenReturn(666);
        PowerMockito.whenNew(ClassB.class).withNoArguments().thenReturn(mockB);
        Assert.assertTrue(new ClassA().callB() == 666);
    }
}