how to test view text within a range using espresso android

Issue

I know that we can use expresso to check view outputs as such: onView((withId(R.id.text_view_name))).check(matches(withText("text_value_here"))); to see if outputs are as expected, but what if we want to make sure it is within a certain range of values? For instance, not below 0.

How can you write test code using espresso that makes sure a UI value is below, above, or within a certain range of values?

Solution

It can be done easily with a custom matcher:

    public class TextViewValueMatcher extends TypeSafeMatcher<View> {
        @Override
        protected boolean matchesSafely(View item) {
            TextView textView = (TextView) item;
            String value = textView.getText().toString();
            boolean matching = <here your condition on the value>;
            return matching;
        }

        @Override
        public void describeTo(Description description) {

        }
    }

And then used as the following:

Espresso.onView(withId(<some_id>)).check(matches(new TextViewValueMatcher()));

Answered By - Anatolii