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kotlinlang

Hi, how do I test an extension function of a Toast or Progressbar?

<https://developer.android.com/training/basics/fragments/testing>

But I just want to test that a toast extension function is working

I have something like
```Context.showToast(@StringRes ....){Toast....})```

You can use assertThat. 
We actually can now test for toast messages using robolectric. The example below is how our team is doing this for now:

    @Test
    public void ccButtonDisplaysToast() throws NullPointerException {
        Button ccRedButton = (Button) findViewById(R.id.cc_red);
        cc_red.performClick(); --&gt; this calls the actual onClickListener implementation which has the toast.
        ShadowLooper.idleMainLooper(YOUR_TIME_HERE); --&gt; This may help you.
        assertThat(ShadowToast.getTextOfLatestToast().toString(), equalTo("TEST_YOUR_TEXT_HERE"));
    }
Hope this helps