AppCompatSpinnerTest.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.support.v7.widget;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.RootMatchers.isPlatformPopup;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;
import static android.support.v7.testutils.TestUtilsMatchers.hasChild;
import static android.support.v7.testutils.TestUtilsMatchers.isCombinedBackground;

import android.content.res.Resources;
import android.support.annotation.ColorInt;
import android.support.annotation.ColorRes;
import android.support.annotation.IdRes;
import android.support.test.filters.SmallTest;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.res.ResourcesCompat;
import android.support.v7.appcompat.test.R;

import org.hamcrest.Matcher;
import org.junit.Test;

/**
 * In addition to all tinting-related tests done by the base class, this class provides
 * tests specific to {@link AppCompatSpinner} class.
 */
@SmallTest
public class AppCompatSpinnerTest
        extends AppCompatBaseViewTest<AppCompatSpinnerActivity, AppCompatSpinner> {
    public AppCompatSpinnerTest() {
        super(AppCompatSpinnerActivity.class);
    }

    @Override
    protected boolean hasBackgroundByDefault() {
        // Spinner has default background set on it
        return true;
    }

    /**
     * Helper method that verifies that the popup for the specified {@link AppCompatSpinner}
     * is themed with the specified color.
     */
    private void verifySpinnerPopupTheming(@IdRes int spinnerId,
            @ColorRes int expectedPopupColorResId, boolean matchDropDownListView) {
        final Resources res = mActivityTestRule.getActivity().getResources();
        final @ColorInt int expectedPopupColor =
                ResourcesCompat.getColor(res, expectedPopupColorResId, null);
        final AppCompatSpinner spinner = (AppCompatSpinner) mContainer.findViewById(spinnerId);

        // Click the spinner to show its popup content
        onView(withId(spinnerId)).perform(click());

        // The internal implementation details of the AppCompatSpinner's popup content depends
        // on the platform version itself (in android.widget.PopupWindow) as well as on when the
        // popup theme is being applied first (in XML or at runtime). Instead of trying to catch
        // all possible variations of how the popup content is wrapped, we use a view matcher that
        // creates a single bitmap that combines backgrounds starting from the parent of the
        // popup content items upwards (drawing them in reverse order), and then tests that the
        // combined bitmap matches the expected color fill. This should remove dependency on the
        // internal implementation details on which exact "chrome" part of the popup has the
        // matching background.
        String itemText = (String) spinner.getAdapter().getItem(2);
        Matcher popupContentMatcher = hasChild(withText(itemText));
        // Note that we are only testing the center pixel of the combined popup background. This
        // is to "eliminate" otherwise hacky code that would need to skip over rounded corners and
        // drop shadow of the combined visual appearance of a popup.
        onView(popupContentMatcher).inRoot(isPlatformPopup()).check(
                matches(isCombinedBackground(expectedPopupColor, true)));

        // Click an entry in the popup to dismiss it
        onView(withText(itemText)).perform(click());
    }

    @Test
    public void testPopupThemingFromXmlAttribute() {
        verifySpinnerPopupTheming(R.id.view_magenta_themed_popup, R.color.test_magenta, true);
    }

    @Test
    public void testUnthemedPopupRuntimeTheming() {
        final AppCompatSpinner spinner =
                (AppCompatSpinner) mContainer.findViewById(R.id.view_unthemed_popup);
        spinner.setPopupBackgroundResource(R.drawable.test_background_blue);
        verifySpinnerPopupTheming(R.id.view_unthemed_popup, R.color.test_blue, false);

        // Set a different popup background
        spinner.setPopupBackgroundDrawable(ContextCompat.getDrawable(
                mActivityTestRule.getActivity(), R.drawable.test_background_green));
        verifySpinnerPopupTheming(R.id.view_unthemed_popup, R.color.test_green, false);
    }

    @Test
    public void testThemedPopupRuntimeTheming() {
        final AppCompatSpinner spinner =
                (AppCompatSpinner) mContainer.findViewById(R.id.view_ocean_themed_popup);
        verifySpinnerPopupTheming(R.id.view_ocean_themed_popup, R.color.ocean_default, true);

        // Now set a different popup background
        spinner.setPopupBackgroundResource(R.drawable.test_background_red);
        verifySpinnerPopupTheming(R.id.view_ocean_themed_popup, R.color.test_red, false);

        // Set a different popup background
        spinner.setPopupBackgroundDrawable(ContextCompat.getDrawable(
                mActivityTestRule.getActivity(), R.drawable.test_background_blue));
        verifySpinnerPopupTheming(R.id.view_ocean_themed_popup, R.color.test_blue, false);
    }
}