Elye Elye - 3 months ago 59
Android Question

How to test TextInputLayout values (hint, error, etc.) using Android Espresso?

I am trying to test using Espresso if my

TextInputLayout
views have specific hint. I'd used a code as below:

Espresso.onView(ViewMatchers.withId(R.id.edit_text_email))
.check(ViewAssertions.matches(
ViewMatchers.withHint(R.string.edit_text_email_hint)))


This works fine for the normal
EditText
views, not wrapped in
TextInputLayout
. However when it wraps around, it no longer works.

I tried to use solution from Android Espresso - How to check EditText hint?, but it still does not working.

I also looked into: https://code.google.com/p/android/issues/detail?id=191261 that reported the issue, it says the workaround is quite easy by pointing to the current
withHint
code, but I can't get it to work.

Any ideas to fix this issue?

Answer

Here's my custom matcher:

public static Matcher<View> hasTextInputLayoutHintText(final String expectedErrorText) {
        return new TypeSafeMatcher<View>() {

            @Override
            public boolean matchesSafely(View view) {
                if (!(view instanceof TextInputLayout)) {
                    return false;
                }

                CharSequence error = ((TextInputLayout) view).getHint();

                if (error == null) {
                    return false;
                }

                String hint = error.toString();

                return expectedErrorText.equals(hint);
            }

            @Override
            public void describeTo(Description description) {
            }
        };
    }
}

and here's how to use:

@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

    @Rule
    public ActivityTestRule<MainActivity> mRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void testMyApp() {
        onView(withId(R.id.textInputLayout)).check
                (matches(hasTextInputLayoutErrorText(mRule.getActivity().getString(R.string
                        .app_name))));

    }

If you would like to check errorText of TextInputLayout, change this line:

     CharSequence error = ((TextInputLayout) view).getHint();

with

     CharSequence error = ((TextInputLayout) view).getError();

Hope it will help