android - 在 InstrumentationTestCase 中模拟

Question

我尝试在我的仪器测试中模拟一个方法，但它失败了，我正在寻找解决它的解决方案。

public class MyTest extends InstrumentationTestCase {

    private Context mAppCtx;

    @Override
    public void setUp() throws Exception {
        super.setUp();

        Context context = mock(Context.class);

        mAppCtx = getInstrumentation().getContext().getApplicationContext();                

        when(mAppCtx.createPackageContext(PACKAGE_NAME, 0)).thenReturn(context);

    }

崩溃发生在以下行：

when(mAppCtx.createPackageContext(PACKAGE_NAME, 0)).thenReturn(context);

我收到以下错误：

org.mockito.exceptions.misusing.MissingMethodInvocationException:
when() requires an argument which has to be 'a method call on a mock'.
For example:
when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
Those methods *cannot* be stubbed/verified.
2. inside when() you don't call method on mock but on some other object.
3. the parent of the mocked class is not public.
It is a limitation of the mock engine.

Answer 1

您需要模拟以下每个方法调用：getInstrumentation().getContext().getApplicationContext();

例子：

Instrumentation inst = mock(Instrumentation.class);
Context instContext = mock(Context.class);
ApplicationContext mAppCtx= mock(ApplicationContext.class);
when(getInstrumentation()).thenReturn(inst);
when(inst.getContext()).thenReturn(instContext);
when(instContext.getApplicationContext()).thenReturn(mAppCtx);
when(mAppCtx.createPackageContext(PACKAGE_NAME, 0)).thenReturn(context);