Add EGTests for passwords settings on iOS

This adds a basic integration test for saving on a test page, and also a test
for copy-password confirmation toast, which is not coverable by the unittests (yet).

BUG=159166

Review-Url: https://codereview.chromium.org/2846253002
Cr-Commit-Position: refs/heads/master@{#468910}

ios/chrome/browser/ui/settings/BUILD.gn

@@ -309,6 +309,7 @@ source_set("test_support") {
   sources = [
     "passphrase_collection_view_controller_test.h",
     "passphrase_collection_view_controller_test.mm",
+    "password_details_collection_view_controller_for_testing.h",
     "personal_data_manager_data_changed_observer.cc",
     "personal_data_manager_data_changed_observer.h",
   ]
@@ -445,6 +446,7 @@ source_set("eg_tests") {
     "autofill_settings_egtest.mm",
     "block_popups_egtest.mm",
     "clear_browsing_data_egtest.mm",
+    "passwords_settings_egtest.mm",
     "settings_egtest.mm",
     "translate_ui_egtest.mm",
   ]
@@ -452,9 +454,12 @@ source_set("eg_tests") {
   deps = [
     ":settings",
     "//base",
+    "//components/autofill/core/common",
     "//components/browsing_data/core",
     "//components/content_settings/core/browser",
+    "//components/keyed_service/core",
     "//components/metrics",
+    "//components/password_manager/core/browser",
     "//components/password_manager/core/common",
     "//components/prefs",
     "//components/search_engines",
@@ -466,10 +471,13 @@ source_set("eg_tests") {
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/content_settings",
+    "//ios/chrome/browser/passwords:passwords",
     "//ios/chrome/browser/search_engines",
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/ui:ui_internal",
+    "//ios/chrome/browser/ui/settings:test_support",
     "//ios/chrome/browser/ui/tools_menu",
+    "//ios/chrome/browser/ui/util:util",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/public/provider/chrome/browser/signin:test_support",

ios/chrome/browser/ui/settings/password_details_collection_view_controller.mm

@@ -293,6 +293,8 @@ reauthenticationModule:(id<ReauthenticationProtocol>)reauthenticationModule
 }
 
 - (void)showCopyPasswordResultToast:(NSString*)message {
+  // TODO(crbug.com/159166): Route this through some delegate API to be able
+  // to mock it in the unittest, and avoid having an EGTest just for that?
   MDCSnackbarMessage* copyPasswordResultMessage =
       [MDCSnackbarMessage messageWithText:message];
   [MDCSnackbarManager showMessage:copyPasswordResultMessage];
@@ -345,4 +347,11 @@ reauthenticationModule:(id<ReauthenticationProtocol>)reauthenticationModule
   }
 }
 
+#pragma mark - ForTesting
+
+- (void)setReauthenticationModule:
+    (id<ReauthenticationProtocol>)reauthenticationModule {
+  _weakReauthenticationModule = reauthenticationModule;
+}
+
 @end

ios/chrome/browser/ui/settings/password_details_collection_view_controller_for_testing.h

+// Copyright 2017 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_SETTINGS_PASSWORD_DETAILS_COLLECTION_VIEW_CONTROLLER_FOR_TESTING_H_
+#define IOS_CHROME_BROWSER_UI_SETTINGS_PASSWORD_DETAILS_COLLECTION_VIEW_CONTROLLER_FOR_TESTING_H_
+
+#import "ios/chrome/browser/ui/settings/password_details_collection_view_controller.h"
+
+@interface PasswordDetailsCollectionViewController (ForTesting)
+
+// Allows to replace a |reauthenticationModule| for a fake one in integration
+// tests, where the testing code cannot control the creation of the
+// controller.
+- (void)setReauthenticationModule:
+    (id<ReauthenticationProtocol>)reauthenticationModule;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SETTINGS_PASSWORD_DETAILS_COLLECTION_VIEW_CONTROLLER_FOR_TESTING_H_