How can I test setResult() in an Android Espresso test?

Question

Is there any good way to test the result code and data in an Android Espresso test? I am using Espresso 2.0.

Suppose I have an Activity called BarActivity.class, which upon performing some action, calls setResult(int resultCode, Intent data) with the appropriate payload.

I'd like to write a test case to verify the resultCode and data. However, because setResult() is a final method, I can't override it.

Some options I thought about were:

• Define a new method like setActivityResult() and just use that so it can be intercepted, etc...
• Write a test-only TestActivity that will call startActivityForResult() on BarActivity and check the result in TestActivity.onActivityResult()

Trying to think what's lesser of the two evils, or if there's any other suggestions on how to test for this. Any suggestions? Thanks!

Answer 1

If meanwhile you switched to the latest Espresso, version 3.0.1, you can simply use an ActivityTestRule and get the Activity result like this:

assertThat(rule.getActivityResult(), hasResultCode(Activity.RESULT_OK));
assertThat(rule.getActivityResult(), hasResultData(IntentMatchers.hasExtraWithKey(PickActivity.EXTRA_PICKED_NUMBER)));

You can find a working example here.