单元测试WritableNativeMap时出现UnsatisfiedLinkError

Question

我目前正在创建一个用于反应原生项目的Android库.我需要向javascript发出一个map,所以我正在使用react native的WriteableMap类.不幸的是,该类在一个静态块中加载reactnativejni SO,这会在单元测试期间导致UnsatisfiedLinkError.我正在使用JUnit和Mockito进行测试.

我的代码:

@Override
public void onSomething() {
    WritableMap params = Arguments.createMap();

    //fill map

    sendEvent("onChange", params);
}

错误:

java.lang.UnsatisfiedLinkError: no reactnativejni in java.library.path
  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
  at java.lang.Runtime.loadLibrary0(Runtime.java:870)
  at java.lang.System.loadLibrary(System.java:1119)
  at com.facebook.soloader.SoLoader.loadLibrary(SoLoader.java:172)
  at com.facebook.react.bridge.NativeMap.<clinit>(NativeMap.java:23)
  at com.facebook.react.bridge.Arguments.createMap(Arguments.java:29)
  at me.MyClass.onSomething(myClass.java:23)

我Arguments.createMap()在看到关于为单元测试存储WriteableMap的注释后开始使用该方法,但它是静态的,我宁愿不必存根静态方法.

有没有办法在运行单元测试时摆脱这个错误？

Answer 1

我不认为你可以避免在单元测试中模拟Arguments方法(虽然我相信你不需要在仪器测试中这样做).

在Facebook自己的测试中,他们PowerMockito用来模拟它们:https: //github.com/facebook/react-native/blob/master/ReactAndroid/src/test/java/com/facebook/react/RootViewTest.java#L67

有趣的位:

PowerMockito.mockStatic(Arguments.class);
PowerMockito.when(Arguments.createArray()).thenAnswer(new Answer<Object>() {
  @Override
  public Object answer(InvocationOnMock invocation) throws Throwable {
    return new JavaOnlyArray();
  }
});
PowerMockito.when(Arguments.createMap()).thenAnswer(new Answer<Object>() {
  @Override
  public Object answer(InvocationOnMock invocation) throws Throwable {
    return new JavaOnlyMap();
  }
});

另请注意,这需要您修改build.gradle以包含这些模拟工具:https: //github.com/facebook/react-native/blob/master/ReactAndroid/build.gradle#L266

dependencies {
  ...
  testCompile "org.powermock:powermock-api-mockito:${POWERMOCK_VERSION}"
  testCompile "org.powermock:powermock-module-junit4-rule:${POWERMOCK_VERSION}"
  testCompile "org.powermock:powermock-classloading-xstream:${POWERMOCK_VERSION}"
  testCompile "org.mockito:mockito-core:${MOCKITO_CORE_VERSION}"
  testCompile "org.easytesting:fest-assert-core:${FEST_ASSERT_CORE_VERSION}"
  testCompile "org.robolectric:robolectric:${ROBOLECTRIC_VERSION}"
  ...
}

他们使用的版本可以在他们的gradle.properties文件中找到.

我不知道这些测试配置从长远来看会有多稳定,但是这种配置让我可以在单元测试中使用ReadableMap/Array和WritableMap/Array.