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

Issue

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!

Solution

If you are willing to upgrade to 2.1, then take a look at Espresso-Intents:

Using the intending API (cousin of Mockito.when), you can provide a response for activities that are launched with startActivityForResult

This basically means it is possible to build and return any result when a specific activity is launched (in your case the BarActivity class).

Check this example here: https://google.github.io/android-testing-support-library/docs/espresso/intents/index.html#intent-stubbing

And also my answer on a somewhat similar issue (but with the contact picker activity), in which I show how to build a result and send it back to the Activity which called startActivityForResult()

Answered By - appoll