OpenTracks/src/androidTest/java/de/dennisguse/opentracks/util/EspressoUtils.java

package de.dennisguse.opentracks.util;

import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;

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

import androidx.test.espresso.UiController;
import androidx.test.espresso.ViewAction;

import com.google.android.material.tabs.TabLayout;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

public class EspressoUtils {

    public static Matcher<View> childAtPosition(
            final Matcher<View> 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));
            }
        };
    }

    public static Matcher<View> withListSize (final int size) {
        return new TypeSafeMatcher<>() {
            @Override
            public boolean matchesSafely(final View view) {
                return ((ListView) view).getCount() == size;
            }

            @Override
            public void describeTo(final Description description) {
                description.appendText("ListView should have " + size + " items");
            }
        };
    }

    public static ViewAction waitFor(final long duration_ms) {
        return new ViewAction() {

            @Override
            public String getDescription() {
                return "Wait for milliseconds.";
            }

            @Override
            public Matcher<View> getConstraints() {
                return isDisplayed();
            }

            @Override
            public void perform(UiController uiController, final View view) {
                uiController.loopMainThreadForAtLeast(duration_ms);
            }
        };
    }

    public static ViewAction selectTabAtIndex(final int index) {
        return new ViewAction() {
            @Override
            public String getDescription() {
                return "Selecting tab.";
            }

            @Override
            public Matcher<View> getConstraints() {
                return isDisplayed();
            }

            @Override
            public void perform(UiController uiController, View view) {
                TabLayout tabLayout = (TabLayout) view;
                tabLayout.getTabAt(index).select();
            }
        };
    }

}