Android，PowerMock：文件夹 androidTest 中的测试 class：javassist.NotFoundException：

Question

我想在我的 Android 应用程序上测试静态方法。

我的build.gradle:

dependencies {
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile "org.mockito:mockito-android:2.7.21"
    androidTestCompile "org.powermock:powermock-api-mockito:1.6.6"
    androidTestCompile 'org.powermock:powermock-module-junit4:1.6.6'

    testCompile 'junit:junit:4.12'
    testCompile 'org.powermock:powermock-api-mockito:1.6.6'
    testCompile 'org.powermock:powermock-module-junit4:1.6.6'
}

我的 Android 应用的 PowerMock 测试：

import static org.hamcrest.MatcherAssert.assertThat;
import static org.mockito.Mockito.when;
import static org.powermock.api.mockito.PowerMockito.mockStatic;

@RunWith(PowerMockRunner.class)
@PrepareForTest(StringUtil.class)
public class StringUtilInstrumentedTest {
    private Context context;

    @Before
    public void init() {
        context = InstrumentationRegistry.getTargetContext();
    }

    @Test
    public void decliningAge() {
        mockStatic(StringUtil.class);

        // use Mockito to set up your expectation
        String expected = "first";
        when(StringUtil.calcAge(context, 1)).thenReturn(expected);
        assertThat(StringUtil.calcAge(context, 1), is(expected));     
    }
}

但是当我尝试开始测试时，抛出异常：

I/TestRunner(32154): java.lang.ClassNotFoundException: com.mycompany.StringUtilInstrumentedTest
I/TestRunner(32154):    at java.lang.Class.classForName(Native Method)
android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1879)
I/TestRunner(32154): Caused by: java.lang.IllegalStateException: Failed to transform class with name com.mycompany.StringUtilInstrumentedTest. Reason: com.mycompany.StringUtilInstrumentedTest
org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java
I/TestRunner(32154): Caused by: javassist.NotFoundException: com.mycompany.StringUtilInstrumentedTest
I/TestRunner(32154):    at javassist.ClassPool.get(ClassPool.java:452)

为什么会出现此错误？

Answer 1

如果 StringUtilInstrumentedTest 位于 src/test/java 中，则可以使用 PowerMock。但是，如果它在 src/androidTest/java 中，那么它将不起作用。

PowerMock 不适用于 Android 仪器测试。参考这个：https://github.com/powermock/powermock/issues/594

Sorry for the late response. PowerMock won't work on Android if you run it on a device since PowerMock is using JVM byte code manipulation. It will work if you run it on a JVM though.

Android，PowerMock：文件夹 androidTest 中的测试 class：javassist.NotFoundException：

Android, PowerMock: Test class in folder androidTest: javassist.NotFoundException:

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