Fix flaky #testCanCopyPasswordIfReauthSucceeds

Speculative fix by adding a Toast Shadow.

Flakes when resharded - stumbled on this when dry runs failed
for my CL https://crrev.com/c/4571882

See also https://chromium-review.googlesource.com/c/chromium/src/+/4519916/comment/7cc1fe67_24781a0f/

(cherry picked from commit 017872b)

Change-Id: I26e019f664c135b020803dbdc889d60dd7cd3d0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4575084
Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
Reviewed-by: Lijin Shen <lazzzis@google.com>
Auto-Submit: Donn Denman <donnd@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1151388}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4590315
Commit-Queue: Theresa Sullivan <twellington@chromium.org>
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Cr-Commit-Position: refs/branch-heads/5790@{#379}
Cr-Branched-From: 1d71a33-refs/heads/main@{#1148114}

chrome/browser/password_entry_edit/android/internal/java/src/org/chromium/chrome/browser/password_entry_edit/CredentialEditControllerTest.java

@@ -51,6 +51,8 @@
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
 
 import org.chromium.base.Callback;
 import org.chromium.base.metrics.RecordHistogram;
@@ -63,12 +65,13 @@
 import org.chromium.chrome.browser.password_manager.settings.PasswordAccessReauthenticationHelper.ReauthReason;
 import org.chromium.ui.base.Clipboard;
 import org.chromium.ui.modelutil.PropertyModel;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Tests verifying that the credential edit mediator modifies the model correctly.
  */
 @RunWith(BaseRobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
+@Config(shadows = {CredentialEditControllerTest.ShadowToast.class})
 public class CredentialEditControllerTest {
     private static final String TEST_URL = "https://m.a.xyz/signin";
     private static final String TEST_USERNAME = "TestUsername";
@@ -88,6 +91,16 @@ public class CredentialEditControllerTest {
     @Mock
     private Runnable mHelpLauncher;
 
+    /** Shadow for the {@link Toast} class to make sure we don't try to run it's native code. */
+    @Implements(Toast.class)
+    public static class ShadowToast {
+        public ShadowToast() {}
+
+        /** Ignore show(). */
+        @Implementation
+        protected void show() {}
+    }
+
     CredentialEditMediator mMediator;
     PropertyModel mModel;
 
@@ -212,6 +225,8 @@ public void testCanCopyPasswordIfReauthSucceeds() {
         Context context = ApplicationProvider.getApplicationContext();
         mMediator.onCopyPassword(context);
 
+        verify(mReauthenticationHelper)
+                .reauthenticate(eq(ReauthReason.COPY_PASSWORD), any(Callback.class));
         ClipboardManager clipboard =
                 (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
         assertNotNull(clipboard.getPrimaryClip());