package com.tutorialspoint.espressosamples.helloworldapp;

import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import androidx.test.espresso.ViewInteraction;
import androidx.test.filters.LargeTest;
import androidx.test.rule.ActivityTestRule;
import androidx.test.runner.AndroidJUnit4;

import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.assertion.ViewAssertions.matches;
import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
import static androidx.test.espresso.matcher.ViewMatchers.withId;
import static androidx.test.espresso.matcher.ViewMatchers.withText;
import static org.hamcrest.Matchers.allOf;

@LargeTest
@RunWith(AndroidJUnit4.class)
public class MainActivityTest {
   @Rule
   public ActivityTestRule mActivityTestRule = new ActivityTestRule<>(MainActivity.class);
   @Test
   public void mainActivityTest() {
      ViewInteraction textView = onView(
         allOf(withId(R.id.textView_hello), withText("Hello World!"),
         childAtPosition(childAtPosition(withId(android.R.id.content),
         0),0),isDisplayed()));
      textView.check(matches(withText("Hello World!")));
   }
   private static Matcher childAtPosition(
      final Matcher parentMatcher, final int position) {
      return new TypeSafeMatcher() {
         @Override
         public void describeTo(Description description) {
            description.appendText("Child at position " + position + " in parent ");
            parentMatcher.describeTo(description);
         }
         @Override
         public boolean matchesSafely(View view) {
            ViewParent parent = view.getParent();
            return parent instanceof ViewGroup &&
               parentMatcher.matches(parent)&& view.equals(((ViewGroup)
               parent).getChildAt(position));
         }
      };
   }
}