为具有泛型的类创建一个Espresso Matcher

import android.view.View;
import android.widget.TextView;
import androidx.test.espresso.matcher.BoundedMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

public class GenericMatcher<T extends View> extends BoundedMatcher<View, T> {

    private Matcher<T> matcher;

    public GenericMatcher(Matcher<T> matcher) {
        super(matcher.getClass());
        this.matcher = matcher;
    }

    @Override
    protected boolean matchesSafely(T item) {
        return matcher.matches(item);
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("Matches the specified generic view");
    }

    public static <T extends View> Matcher<T> withGenericMatcher(Matcher<T> matcher) {
        return new GenericMatcher<>(matcher);
    }
}

import androidx.test.espresso.Espresso;
import androidx.test.espresso.matcher.ViewMatchers;
import org.hamcrest.Matchers;
import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.matcher.ViewMatchers.withId;

public class ExampleTest {

    @Test
    public void testGenericMatcher() {
        onView(withId(R.id.textView))
                .check(matches(withGenericMatcher(ViewMatchers.withText("Hello Espresso"))));
    }
}