Android的ApplicationTestCase使用MockContext [英] Android ApplicationTestCase using a MockContext

问题描述

我是新来的Andr​​oid测试，我试图创建使用MockContext（以及实际上我想用一个重命名模拟上下文）的ApplicationTestCase。但我不断收到AssertionFailedError异常。这是我非常基本的code到目前为止：

I'm new to Android testing and I'm trying to create an ApplicationTestCase using a MockContext (well actually I'm trying to use a Renaming Mock Context). But I keep getting an AssertionFailedError. Here's my very basic code so far:

AppTests.java

AppTests.java

package com.myProject.test;

import android.test.ApplicationTestCase;

public class AppTests extends ApplicationTestCase<MyApplication> {
    public AppTests() {
        super(MyApplication.class);
    }

    @Override
    protected void setUp() throws Exception {
        final RenamingMockContext mockContext = new RenamingMockContext(getContext());
        setContext(mockContext);
        createApplication();
    }

}

MyApplication.java

MyApplication.java

package com.myProject.test;

import android.app.Application;

public class MyApplication extends Application {

    public MyApplication() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

}

RenamingMockContext.java

RenamingMockContext.java

package com.myProject.test;

import android.content.Context;
import android.content.SharedPreferences;
import android.test.RenamingDelegatingContext;
import android.test.mock.MockContext;

public class RenamingMockContext extends RenamingDelegatingContext {

    private static final String PREFIX = "test.";

    public RenamingMockContext(Context context) {
        super (new DelegatedMockContext(context), PREFIX);
        //super(context, PREFIX);
    }

    private static class DelegatedMockContext extends MockContext {
        private Context mDelegatedContext;
        public DelegatedMockContext(Context context) {
            mDelegatedContext = context;
        }

        @Override
        public String getPackageName() {
            return mDelegatedContext.getPackageName();
        }

        @Override
        public SharedPreferences getSharedPreferences(
          String name, int mode) {
          return mDelegatedContext.getSharedPreferences(
            PREFIX + name, mode);
        }

    }

}

故障跟踪：

junit.framework.AssertionFailedError
at android.test.ApplicationTestCase.setupApplication(ApplicationTestCase.java:102)
at android.test.ApplicationTestCase.createApplication(ApplicationTestCase.java:118)
at com.myApplication.test.AppTests.setUp(AppTests.java:14)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1710)

请注意，如果我使用第二个超（）调用的RenamingMockContext构造被注释掉（所以不要使用扩展MockContext类），它工作正常。

Note if I use the second super() call in the RenamingMockContext constructor that is commented out (so don't use the extended MockContext class) it works fine.

下面是引用<一个href="http://stackoverflow.com/questions/5267671/unsupportedoperationexception-while-calling-getshared$p$pferences-from-unit-tes">UnsupportedOperationException同时呼吁getShared preferences（）的单元测试这对我没有工作，我也通过这本书的Andr​​oid应用程序测试指南它举了一个例子正是这样的阅读，但是当我下载的源和运行它，直接它给了同样的错误。

Here is a reference UnsupportedOperationException while calling getSharedPreferences() from unit test which didn't work for me, and I also read through the book Android Application Testing Guide which gives an example exactly like this, but when I downloaded the source and ran it directly it gave the same error.

推荐答案

作为一种变通方法为该书样本，检查Android开发者指南ApplicationTestCase：如果只是运行测试原来的样子，你的应用程序将与一个注入全功能的上下文（ http://developer.android.com/reference/android /test/ApplicationTestCase.html ）。

As a workaround for that book sample, check the android developer guide to ApplicationTestCase: "If simply run your tests as-is, your Application will be injected with a fully-functional Context" (http://developer.android.com/reference/android/test/ApplicationTestCase.html).

设置方法的几行加以注释，以获得测试工作：

A few lines of the Setup method must be commented to get the test working:

protected void setUp() throws Exception
    {
        super.setUp();
        // final RenamingMockContext mockContext = new RenamingMockContext(
        // getContext());
        // setContext(mockContext);

        createApplication();
        mApplication = getApplication();
    }

这篇关于Android的ApplicationTestCase使用MockContext的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！