android – Espresso startActivity that depends on Intent-ThrowExceptions

Exception or error:

I have the following situation.

My activity has a fragment that depends of a Serializable Object. Here is my onCreate:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    MyObject myObj = (MyObj) getIntent().getSerializableExtra("myobj");

    if(myObj != null) {
        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction transaction = manager.beginTransaction();
        transaction.add(R.id.container, MyFragment.newInstance(myObj));
        transaction.commit();
    }
}

But in my Espresso test I simply can’t pass the intent to the activity before it’s created. I tried with setActivityIntent in several ways but cant figure out how to make it work.

Here is my last attempt:

import android.content.Intent;
import android.support.test.InstrumentationRegistry;
import android.support.test.espresso.Espresso;
import android.test.ActivityInstrumentationTestCase2;
import org.junit.Before;

import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

public class MyActivityTest extends

     ActivityInstrumentationTestCase2<MyActivity> {

        private MyActivity activity;
        private MyObject myObj;

        public MyActivityTest() {
            super(MyActivity.class);
        }

        @Before
        protected void setUp() throws Exception {
            super.setUp();
            injectInstrumentation(InstrumentationRegistry.getInstrumentation());
            myObj = MyObject.mockObject();
            Intent i = new Intent();
            i.putExtra("myobj", myObj);
            setActivityIntent(i);

        }

        public void testName(){
            Espresso.onView(withId(R.id.name)).check(matches(withText(myObj.getObjName())));
        }

    }

I’ve searched a lot but nothing works. MyObject is always null in the test. I think this should be simple. What am I’m missing?

How to solve:

You can define the Intent to be used in this way

@RunWith(AndroidJUnit4.class)
public class MyActivityTestTest {

    private MyObject myObj;

    @Rule
    // third parameter is set to false which means the activity is not started automatically
    public ActivityTestRule<MyActivity> mActivityRule =
        new ActivityTestRule<>(MyActivity.class, false, false);


    @Test
    public void testName() {

          myObj = MyObject.mockObject();
          Intent i = new Intent();
          i.putExtra("myobj", myObj);
          mActivityRule.launchActivity(i);

         //...
    }

}

###

You can override the ActivityTestRule.getActivityIntent() method and return a required Intent:

@Rule
public ActivityTestRule<MyActivity> mActivityRule =
        new ActivityTestRule<MyActivity>(MyActivity.class){

    @Override
    protected Intent getActivityIntent() {
        Intent intent = new Intent();
        intent.putExtra("myobj", myObj);
        return intent;
    }
};

###

It doesn’t look like you are actually starting the activity anywhere.

Try calling getActivity() on the first line of testName().

This will launch the activity that you passed into the super constructor.

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