Add integration tests to incognito interstitial from account picker.

This CL adds integration tests to verify the incognito interstitial
methods are invoked correctly when navigating from the account picker
dialog to the Incognito interstitial.

Bug: 1125979
Change-Id: Ieb41f23e8ca79a7006e20ce8ae7d16acb60f2231
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424255
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810131}

chrome/android/java/src/org/chromium/chrome/browser/incognito/interstitial/IncognitoInterstitialDelegate.java

@@ -22,7 +22,8 @@ import org.chromium.chrome.browser.tabmodel.TabModelUtils;
 
 /**
  * This class is responsible for the providing the functionality to the "Learn More" and "Continue"
- * button in the Incognito interstitial.
+ * button in the Incognito interstitial. This should be used in conjunction with the incognito
+ * interstitial MVC.
  */
 public class IncognitoInterstitialDelegate {
     private final Activity mActivity;
@@ -53,7 +54,7 @@ public class IncognitoInterstitialDelegate {
      * Open the help centre article regarding Incognito usage.
      */
     @MainThread
-    void openLearnMorePage() {
+    public void openLearnMorePage() {
         ThreadUtils.assertOnUiThread();
         mHelpAndFeedbackLauncher.show(mActivity,
                 mActivity.getString(R.string.help_context_incognito_learn_more),
@@ -65,7 +66,7 @@ public class IncognitoInterstitialDelegate {
      * the current regular tab.
      */
     @MainThread
-    void openCurrentUrlInIncognitoTab() {
+    public void openCurrentUrlInIncognitoTab() {
         ThreadUtils.assertOnUiThread();
         AccountPickerDelegate.recordAccountConsistencyPromoAction(
                 AccountConsistencyPromoAction.STARTED_INCOGNITO_SESSION);

chrome/android/javatests/src/org/chromium/chrome/browser/signin/AccountPickerBottomSheetTest.java

@@ -438,6 +438,24 @@ public class AccountPickerBottomSheetTest {
         checkIncognitoInterstitialSheet();
     }
 
+    @Test
+    @MediumTest
+    public void testLearnMoreButtonOnIncognitoInterstitial() {
+        buildAndShowExpandedBottomSheet();
+        onView(withText(R.string.signin_go_incognito)).perform(click());
+        onView(withId(R.id.incognito_interstitial_learn_more)).perform(click());
+        verify(mIncognitoInterstitialDelegateMock).openLearnMorePage();
+    }
+
+    @Test
+    @MediumTest
+    public void testContinueButtonOnIncognitoInterstitial() {
+        buildAndShowExpandedBottomSheet();
+        onView(withText(R.string.signin_go_incognito)).perform(click());
+        onView(withId(R.id.incognito_interstitial_continue_button)).perform(click());
+        verify(mIncognitoInterstitialDelegateMock).openCurrentUrlInIncognitoTab();
+    }
+
     private void checkIncognitoInterstitialSheet() {
         onView(withId(R.id.account_picker_bottom_sheet_logo)).check(matches(isDisplayed()));
         onView(withId(R.id.account_picker_bottom_sheet_title))
@@ -448,6 +466,9 @@ public class AccountPickerBottomSheetTest {
         onView(withId(R.id.account_picker_horizontal_divider)).check(matches(not(isDisplayed())));
         onView(withId(R.id.account_picker_account_list)).check(matches(not(isDisplayed())));
         onView(withId(R.id.incognito_interstitial_bottom_sheet_view)).check(matches(isDisplayed()));
+        onView(withText(R.string.incognito_interstitial_message)).check(matches(isDisplayed()));
+        onView(withId(R.id.incognito_interstitial_learn_more)).check(matches(isDisplayed()));
+        onView(withId(R.id.incognito_interstitial_continue_button)).check(matches(isDisplayed()));
     }
 
     private void clickContinueButtonAndWaitForErrorSheet() {