RogerParis RogerParis - 1 month ago 9
Android Question

Android Espresso. How to check ErrorText in TextInputLayout

Basically I am trying to test that after login incorrectly I have an error showing in the email field.

The view is:

<android.support.design.widget.TextInputLayout
android:id="@+id/ti_email"
android:paddingEnd="10dp"
android:paddingTop="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingStart="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<EditText
android:id="@+id/et_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/authentication_email_placeholder"
android:inputType="textEmailAddress"
android:maxLines="1"
android:textSize="16sp"
tools:text="@string/placeholder_email"/>

</android.support.design.widget.TextInputLayout>


I try to do it like this:

onView(withId(R.id.et_email))
.check(matches(hasErrorText(
ctx.getString(R.string.authentication_error_empty_email))));

Answer

This works with a CustomMatcher:

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

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

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

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

            String hint = error.toString();

            return expectedErrorText.equals(hint);
        }

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