模擬一種在Android中獲得代碼覆蓋率的方法

Question

我正在以測試驅動的方式編寫Android OpenGL ES 2.0應用程序。 這是我的代碼。

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         boolean checkCompatability = checkForDeviceCompatablity();


         if(checkCompatability)
         {
                Toast.makeText(this, "Your device is opengl compatible", Toast.LENGTH_LONG).show();

         }
         else
         {
            Toast.makeText(this, "Your device does not support OpenGL", Toast.LENGTH_LONG).show();
         }
    }

    public boolean checkForDeviceCompatablity() {
        ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);

        ConfigurationInfo info = manager.getDeviceConfigurationInfo();
        boolean result = info.reqGlEsVersion >= 0x20000
            || (Build.VERSION.SDK_INT
                    >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1);

        return result;
    }

}

這是我的考驗

public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {

    private MainActivity mActivity;

    public MainActivityTest(Class<MainActivity> activityClass) {
        super(activityClass);
    }

    public MainActivityTest(){
        super(MainActivity.class);
    }

    //The below method would always return me a true as I test it in a real device.
    public void testIntegrationCheckForConfiguration() {
        mActivity = getActivity();
        mActivity.startActivity(mActivity.getIntent());
        boolean resultConfiguration = mActivity.checkForDeviceCompatablity();
        assertNotNull(resultConfiguration);
    }

    //I need to mock the above method into something like the below method so that I can get coverage for the else block.
    public void testCheckForConfigurationWhenDeviceIsOfInCorrectConfiguration(){
        mActivity = new MainActivity(){
            @Override
            public boolean checkForDeviceCompatablity() {
                return false;
            }
        };
        mActivity.startActivity(mActivity.getIntent());
        boolean compatability = mActivity.checkForDeviceCompatablity();
        assertTrue(compatability);
    }
}

我知道我做錯了。 但是我需要一種方法來模擬checkForDeviceCompatability以使其返回false。 運行測試時，我在startActivity調用中收到NullPointerException。 如何模擬功能checkForDeviceCompatability並使代碼覆蓋MainActivity類的else部分？

使用任何一種模擬框架也是可能的嗎？

Answer 1

並不是說我對這種事情有很多經驗，但是您可以嘗試Mockito 。

在將Dagger依賴項注入集成到我的應用程序的示例中注意到了這一點。