How to Test Toast Message using Espresso?

Now a days many apps uses Toast Messages and if you are testing android app which displays Toast Messages and you want to write Espresso test case to assert the Toast Message then this post will help you to achieve that. In last post I have shared how to add Custom Matcher? which will help you to understand this post clearly as I am going to add a custom Matcher to test Toast.

Video Tutorial - 

 

Check below is the ToastMatcher which identifies the Toast is not part of activity window-

public class ToastMatcher extends TypeSafeMatcher<Root> {

    @Override    public void describeTo(Description description) {
        description.appendText("is toast");
    }

    @Override    public boolean matchesSafely(Root root) {
        int type = root.getWindowLayoutParams().get().type;
        if ((type == WindowManager.LayoutParams.TYPE_TOAST)) {
            IBinder windowToken = root.getDecorView().getWindowToken();
            IBinder appToken = root.getDecorView().getApplicationWindowToken();
            if (windowToken == appToken) {
              return true;
            }
        }
        return false;
    }

This ToastMatcher you can use it in your test case like this -

1. Test if the Toast Message is Displayed

onView(withText(R.string.mssage)).inRoot(new ToastMatcher())
.check(matches(isDisplayed()));

2. Test if the Toast Message is not Displayed

onView(withText(R.string.mssage)).inRoot(new ToastMatcher())
.check(matches(not(isDisplayed())));

3. Test id the Toast contains specific Text Message

onView(withText(R.string.mssage)).inRoot(new ToastMatcher())
.check(matches(withText("Invalid Name"));

 

I hope this post helps you find your code coverage for your test suit :)
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