CODEWITHSUNDEEP
androidandroid-studioui-testingandroid-espresso
kioli
kioli

Reputation: 725

Android espresso with Fragments. getActivity returns NULL

I am trying to run some integration tests with Espresso on a simple activity that once launched triggers a loader to retrieve some data.

The problem is that when I run my tests (even very simple such as checking if a button is on the main page) the result varies continuously, and I keep getting various times NPE

Attempt to invoke virtual method 'android.content.Context.getApplicationContext()' on a null object reference

My activity is empty and holds a fragment, and the error can get tracked back to when, to launch the loader, I ask for the context

MyLoader loader = new MyLoader(getActivity(), certainUrl);

From this I get that getActivity() returns null sometimes, and then down the line this throws an exception (since in the Android Loader class the method context.getApplicationContext is called)

This is my test class

public class HomeFragmentTest extends ActivityInstrumentationTestCase2<HomeActivity> {

    private HomeActivity _activity;

    public HomeFragmentTest() {
        super(HomeActivity.class);
    }

    protected void setUp() throws Exception {
        super.setUp();
        _activity = getActivity();
        injectInstrumentation(getInstrumentation());
    }

    public void testButton() {
        onView(withId(R.id.button))
                .check(matches(allOf(
                        isDisplayed(),
                        ViewMatchers.isCompletelyDisplayed()
                )));
    }
}

Thank you all for the help

Upvotes: 2

Views: 1577

Answers (1)

piotrek1543
piotrek1543

Reputation: 19361

Change your setUp method like in this example: 

public class FirstActivityUnitTest extends

    android.test.ActivityUnitTestCase<FirstActivity> {

  private FirstActivity activity;

  public FirstActivityUnitTest() {
    super(FirstActivity.class);
  }

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    Intent intent = new Intent(getInstrumentation().getTargetContext(),
        FirstActivity.class);
    startActivity(intent, null, null);
    activity = getActivity();
  }

  @SmallTest
  public void testSomething() {
    // assertions here
  }

  @Override
  protected void tearDown() throws Exception {
    super.tearDown();
  }
}

Also check if in build.gradle file you have these dependencies:

 android {
   defaultConfig {
     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
           }
        }

 dependencies {  
   androidTestCompile 'com.android.support:support-annotations:23.+'
   androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
   androidTestCompile 'com.android.support.test:runner:0.4.1'
   androidTestCompile 'com.android.support.test.espresso:espresso-intents:2.2.1'
}

The most important here is to declare testInstrumentationRunner

Upvotes: 1

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