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Android Testing with Robolectric and Dagger

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一生所求
一生所求 2021-01-24 23:33

I am trying to write an Android application using Dagger. Trying to follow the TDD approach, I started writing a test for my First activity. For writing tests I am using Robole

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  • 长发绾君心
    长发绾君心 (楼主)
    2021-01-25 00:04

    Ok, first off, user2511882 I have tried your solution before posting the question but the thing is, if you look at the structure of TestMyApplication, where I inject the test module, you would see that your suggestion and my previous tries could not work.

    After rethinking the whole problem I have found a solution along the lines of my initial tries and also a more useful solution (as far as I can see it). First off, I do not rely on the TestMyApplication class anymore. Furthermore I had to do some changes to MyApplication class to make it more "test friendly" (without changing its functionality). So MyApplication class looks like this:

    public class MyApplication extends DaggerApplication
{
   private List modules;
   public MyApplication() {
       modules = new ArrayList();
       modules.add(new AppModule(this));
   }

@Override
protected List getAppModules() {
    return modules;
}
}



    Now I can create the two test modules, one in which I set the behavior to return true when asking for an internet connection and one which will return false for the same query.
    


    Now, in my test class I would have the following:
    


    @RunWith(RobolectricTestRunner.class)
public class SplashScreenActivityTest
{
    SplashScreenActivity activity;

    public void setUpNoInternet()
    {
// Now I can add the new test module to the application modules to override the real one in the application onCreate() method
        ((MyApplication)Robolectric.application).getAppModules().add(new GeneralUtilsModuleNoInternetConnection());
        activity = Robolectric.buildActivity(SplashScreenActivity.class).create().get();
    }
    public void setUpWithInternet()
    {
        ((MyApplication)Robolectric.application).getAppModules().add(new GeneralUtilsModuleWithInternetConnection());
        activity = Robolectric.buildActivity(SplashScreenActivity.class).create().get();
    }


    @Test
    public void testOnCreate_whenNoInternetConnection()
    {
        setUpNoInternet();
       
    }
    @Test
    public void testOnCreate_whenThereIsInternetConnection()
    {
        setUpWithInternet();
       
    }

}

    


    This works fine and is along the lines of my initial plan of testing. But I think there is a more elegant solution instead of creating a new test module for each situation. The modified test module looks like this:
    


    @Module(
    includes = AppModule.class,
    injects = {SplashScreenActivityTest.class,
            SplashScreenActivity.class},
    overrides = true
)
public class GeneralUtilsModuleTest
{
    private  GeneralUtils mockGeneralUtils;

    public GeneralUtilsModuleTest() {
        mockGeneralUtils = Mockito.mock(GeneralUtils.class);
    }

    @Provides
    @Singleton
    GeneralUtils provideGeneralUtils() {

        return mockGeneralUtils;
    }

    public GeneralUtils getGeneralUtils()
    {
        return mockGeneralUtils;
    }

    public void setGeneralUtils(final GeneralUtils generalUtils)
    {
        this.mockGeneralUtils = generalUtils;
    }
}

    


    Using this, the Test class looks like this:
    


        @RunWith(RobolectricTestRunner.class)
public class SplashScreenActivityTest
{
    SplashScreenActivity activity;

    private GeneralUtilsModuleTest testModule;
    private GeneralUtils generalUtils;

    @Before
    public void setUp()
    {
        testModule = new GeneralUtilsModuleTest();
        generalUtils = Mockito.mock(GeneralUtils.class);
    }

    public void setUpNoInternet()
    {
        when(generalUtils.isInternetConnection()).thenReturn(false);
        testModule.setGeneralUtils(generalUtils);
        ((MyApplication)Robolectric.application).getAppModules().add(testModule);
        activity = Robolectric.buildActivity(SplashScreenActivity.class).create().get();
    }
    public void setUpWithInternet()
    {
        when(generalUtils.isInternetConnection()).thenReturn(true);
        testModule.setGeneralUtils(generalUtils);
        (MyApplication)Robolectric.application).getAppModules().add(testModule);
        activity = Robolectric.buildActivity(SplashScreenActivity.class).create().get();
    }
    .....(Tests)....
}

    


    Thank you all for your help and I really hope that this solution will help others achieve better testing on Android.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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