Add instrumentation tests for incognito interstitial.

This CL adds instrumentation tests to verify the UI elements are shown
and to check the callback associated with "LearnMore" and "Continue"
buttons are working fine.


Bug: 1125979
Change-Id: I8eba86c1d5fd10a34e5fe017ef1ac0338d9be54a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404924
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806216}

chrome/android/chrome_test_java_sources.gni

@@ -232,6 +232,7 @@ chrome_test_java_sources = [
   "javatests/src/org/chromium/chrome/browser/incognito/IncognitoProfileDestroyerIntegrationTest.java",
   "javatests/src/org/chromium/chrome/browser/incognito/IncognitoStorageLeakageTest.java",
   "javatests/src/org/chromium/chrome/browser/incognito/IncognitoTabLauncherTest.java",
+  "javatests/src/org/chromium/chrome/browser/incognito/interstitial/IncognitoInterstitialTest.java",
   "javatests/src/org/chromium/chrome/browser/infobar/InfoBarAppearanceTest.java",
   "javatests/src/org/chromium/chrome/browser/infobar/InfoBarContainerTest.java",
   "javatests/src/org/chromium/chrome/browser/infobar/InfoBarTest.java",

chrome/android/javatests/src/org/chromium/chrome/browser/incognito/interstitial/IncognitoInterstitialTest.java

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// 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.incognito.interstitial;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+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 org.mockito.Mockito.verify;
+
+import android.support.test.rule.ActivityTestRule;
+import android.view.View;
+
+import androidx.test.filters.MediumTest;
+
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.flags.ChromeSwitches;
+import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
+import org.chromium.content_public.browser.test.util.TestThreadUtils;
+import org.chromium.ui.test.util.DummyUiActivity;
+
+/**
+ * Instrumentation test class for the incognito interstitial.
+ */
+@RunWith(ChromeJUnit4ClassRunner.class)
+@CommandLineFlags.Add({ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE})
+public class IncognitoInterstitialTest {
+    @Mock
+    private IncognitoInterstitialDelegate mIncognitoInterstitialDelegateMock;
+
+    @Rule
+    public final ActivityTestRule<DummyUiActivity> mActivityTestRule =
+            new ActivityTestRule<>(DummyUiActivity.class);
+
+    @BeforeClass
+    public static void setUpBeforeActivityLaunched() {
+        DummyUiActivity.setTestLayout(R.layout.incognito_interstitial_bottom_sheet_view);
+    }
+
+    @AfterClass
+    public static void tearDown() {
+        DummyUiActivity.setTestLayout(0);
+    }
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        TestThreadUtils.runOnUiThreadBlocking(() -> {
+            View contentView = mActivityTestRule.getActivity().findViewById(android.R.id.content);
+            IncognitoInterstitialCoordinator incognitoInterstitialCoordinator =
+                    new IncognitoInterstitialCoordinator(
+                            contentView, mIncognitoInterstitialDelegateMock);
+        });
+    }
+
+    @Test
+    @MediumTest
+    public void testIncognitoInterstitialElementsShownCorrectly() {
+        onView(withId(R.id.incognito_interstitial_learn_more)).check(matches(isDisplayed()));
+        onView(withId(R.id.incognito_interstitial_continue_button)).check(matches(isDisplayed()));
+    }
+
+    @Test
+    @MediumTest
+    public void testClickOnLearnMoreButton() {
+        onView(withId(R.id.incognito_interstitial_learn_more)).perform(click());
+        verify(mIncognitoInterstitialDelegateMock).openLearnMorePage();
+    }
+
+    @Test
+    @MediumTest
+    public void testClickOnContinueButton() {
+        onView(withId(R.id.incognito_interstitial_continue_button)).perform(click());
+        verify(mIncognitoInterstitialDelegateMock).openCurrentUrlInIncognitoTab();
+    }
+}
\ No newline at end of file

chrome/android/javatests/src/org/chromium/chrome/browser/incognito/interstitial/OWNERS

+file://chrome/android/java/src/org/chromium/chrome/browser/signin/OWNERS
+roagarwal@chromium.org
+
+# TEAM: chrome-privacy-core@google.com
+# COMPONENT: Privacy>Incognito