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chromium/chrome/android/javatests/src/org/chromium/chrome/browser/javascript/CloseWatcherTest.java 

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.chrome.browser.javascript;

import androidx.test.filters.MediumTest;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import org.chromium.base.ThreadUtils;
import org.chromium.base.test.util.CommandLineFlags;
import org.chromium.base.test.util.Features.DisableFeatures;
import org.chromium.base.test.util.Features.EnableFeatures;
import org.chromium.base.test.util.UrlUtils;
import org.chromium.chrome.browser.ChromeTabbedActivity;
import org.chromium.chrome.browser.flags.ChromeFeatureList;
import org.chromium.chrome.browser.flags.ChromeSwitches;
import org.chromium.chrome.browser.tab.Tab;
import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
import org.chromium.chrome.test.ChromeTabbedActivityTestRule;
import org.chromium.chrome.test.util.browser.TabTitleObserver;

/** Unit tests for CloseWatcher's ability to receive signals from the system back button. */
@RunWith(ChromeJUnit4ClassRunner.class)
@CommandLineFlags.Add({
    ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE,
    "enable-experimental-web-platform-features",
    "enable-features=CloseWatcher"
})
public class CloseWatcherTest {
    @Rule
    public ChromeTabbedActivityTestRule mActivityTestRule = new ChromeTabbedActivityTestRule();

    private static final String TEST_URL =
            UrlUtils.encodeHtmlDataUri(
                    "<body><script>let watcher = new CloseWatcher(); watcher.onclose = () =>"
                            + " window.document.title = 'SUCCESS';</script></body>");

    private Tab mTab;

    @Before
    public void setUp() {
        mActivityTestRule.startMainActivityOnBlankPage();
        mTab =
                ThreadUtils.runOnUiThreadBlocking(
                        () -> mActivityTestRule.getActivity().getActivityTab());
    }

    @Test
    @MediumTest
    @DisableFeatures(ChromeFeatureList.BACK_GESTURE_REFACTOR)
    public void testBackButtonTriggersCloseWatcher() throws Throwable {
        ChromeTabbedActivity activity = mActivityTestRule.getActivity();
        mActivityTestRule.loadUrl(TEST_URL);
        ThreadUtils.runOnUiThreadBlocking(() -> activity.onBackPressed());
        new TabTitleObserver(mTab, "SUCCESS").waitForTitleUpdate(3);
    }

    @Test
    @MediumTest
    @EnableFeatures(ChromeFeatureList.BACK_GESTURE_REFACTOR)
    public void testBackButtonTriggersCloseWatcher_BackGestureRefactor() throws Throwable {
        ChromeTabbedActivity activity = mActivityTestRule.getActivity();
        mActivityTestRule.loadUrl(TEST_URL);
        ThreadUtils.runOnUiThreadBlocking(() -> activity.onBackPressed());
        new TabTitleObserver(mTab, "SUCCESS").waitForTitleUpdate(3);
    }

    @Test
    @MediumTest
    @DisableFeatures(ChromeFeatureList.BACK_GESTURE_REFACTOR)
    public void testBackButtonClosesDialogElement() throws Throwable {
        ChromeTabbedActivity activity = mActivityTestRule.getActivity();
        mActivityTestRule.loadUrl(
                UrlUtils.encodeHtmlDataUri(
                        "<dialog id=mydialog>hello</dialog>"
                                + "<script>mydialog.showModal();mydialog.onclose = () =>"
                                + " window.document.title = 'SUCCESS';</script>"));
        ThreadUtils.runOnUiThreadBlocking(() -> activity.onBackPressed());
        new TabTitleObserver(mTab, "SUCCESS").waitForTitleUpdate(3);
    }

    @Test
    @MediumTest
    @EnableFeatures(ChromeFeatureList.BACK_GESTURE_REFACTOR)
    public void testBackButtonClosesDialogElement_BackGestureRefactor() throws Throwable {
        ChromeTabbedActivity activity = mActivityTestRule.getActivity();
        mActivityTestRule.loadUrl(
                UrlUtils.encodeHtmlDataUri(
                        "<dialog id=mydialog>hello</dialog>"
                                + "<script>mydialog.showModal();mydialog.onclose = () =>"
                                + " window.document.title = 'SUCCESS';</script>"));
        ThreadUtils.runOnUiThreadBlocking(() -> activity.onBackPressed());
        new TabTitleObserver(mTab, "SUCCESS").waitForTitleUpdate(3);
    }
}