Android Espresso.如何在TextInputLayout中检查ErrorText

这适用于CustomMatcher:

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

        @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) {
        }
    };
}