How to set Unit Test to Fragment in Android

Question

I want to unit test an Android Fragment class.

Can I set up a test using AndroidTestCase or do I need to use ApplicationTestCase?

Are there any useful exampl

Answer 1

Adding to @abhijit.mitkar's answer.

Given a scenario that your fragment is not a public member in the activity under test.

protected void setUp() {
   mActivity = getActivity();
   mFragment = new TheTargetFragment();

   FragmentTransaction transaction = mActivity.getSupportFragmentManager().beginTransaction();
   transaction.add(R.id.fragment_container, mFragment, "FRAGMENT_TAG");
   transaction.commit();
}

The purpose of the code above is to replace the fragment with a new fragment object that we have access to.

The code below will allow you to gain access to the fragments UI members.

TextView randomTextView= (TextView) mFragment.getView().findViewById(R.id.textViewRandom);

Getting the UI from the activity will not give you the expected result.

TextView randomTextView= (TextView) mActivity.findViewById(R.id.textViewRandom);

Finally if you wish to do some changes in the UI. Like a good android developer do it in the main thread.

mActivity.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        // set text view's value
    }
});

Note: You might want to give it a Thread.sleep() every a test ends. To avoid lock up, the getInstrumentation().waitForIdleSync(); does not seem to work always.

I used ActivityInstrumentationTestCase2 since i was doing functional testing.