Add EGTests for passwords settings on iOS

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

Index: ios/chrome/browser/ui/settings/passwords_settings_egtest.mm
diff --git a/ios/chrome/browser/ui/settings/passwords_settings_egtest.mm b/ios/chrome/browser/ui/settings/passwords_settings_egtest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..0362e76c1a38bacd32209561e452ec555ebdc02f
--- /dev/null
+++ b/ios/chrome/browser/ui/settings/passwords_settings_egtest.mm
@@ -0,0 +1,305 @@
+// 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.
+
+#include "base/callback.h"
+#include "base/mac/foundation_util.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
+#include "components/autofill/core/common/password_form.h"
+#include "components/keyed_service/core/service_access_type.h"
+#include "components/password_manager/core/browser/password_store.h"
+#include "components/password_manager/core/common/password_manager_pref_names.h"
+#include "components/prefs/pref_service.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/passwords/ios_chrome_password_store_factory.h"
+#import "ios/chrome/browser/ui/settings/password_details_collection_view_controller_for_testing.h"
+#import "ios/chrome/browser/ui/settings/reauthentication_module.h"
+#import "ios/chrome/browser/ui/settings/settings_navigation_controller.h"
+#include "ios/chrome/browser/ui/tools_menu/tools_menu_constants.h"
+#import "ios/chrome/browser/ui/util/top_view_controller.h"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/chrome/test/app/chrome_test_util.h"
+#include "ios/chrome/test/earl_grey/accessibility_util.h"
+#import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
+#import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
+#import "ios/chrome/test/earl_grey/chrome_matchers.h"
+#import "ios/chrome/test/earl_grey/chrome_test_case.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "url/gurl.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// This test complements
+// password_details_collection_view_controller_unittest.mm. Very simple
+// integration tests and features which are not currently unittestable should
+// go here, the rest into the unittest.
+// This test only uses the new UI which allows viewing passwords.
+// TODO(crbug.com/159166): Remove the above sentence once the new UI is the
+// default one.
+
+using autofill::PasswordForm;
+using chrome_test_util::ButtonWithAccessibilityLabel;
+using chrome_test_util::ButtonWithAccessibilityLabelId;
+using chrome_test_util::NavigationBarDoneButton;
+
+namespace {
+
+// Matcher for the Settings button in the tools menu.
+id<GREYMatcher> SettingsButton() {

[sdefresne, 2017/05/02 15:30:08]

baxley: are those helper methods (used only once) what you complained about last
week?

[baxley, 2017/05/02 16:20:41]

I think some of these fall under the category of aiding readability. The good
thing here is that they are matchers, and not C-methods wrapping calls to EG
that perform actions or assertions. I wouldn't push back on these matchers,
since I think this is starting to get into personal preference, rather than
violating any style rules or consistency problems.

[vabr (Chromium), 2017/05/03 05:41:37]

Thanks for raising this and for the detailed answer.

What I understood during last week is that slicing chunks out of the tests and
hiding them elsewhere is unhelpful. However, here I argued that what read
roughly as "perform tap on what has accessibility ID kSomething" now reads as
"perform tap on SettingsButton", which does not really hide the spirit, just the
details. Also, in the depending CLs, I am introducing more callsites of those
matchers. Finally, this borrowed from the existing settings EG Test, so at least
it is consistent in the directory.

+  return grey_accessibilityID(kToolsMenuSettingsId);
+}
+
+// Matcher for the Save Passwords cell on the main Settings screen.
+id<GREYMatcher> PasswordsButton() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_SAVE_PASSWORDS);
+}
+
+// Matcher for a password entry for |username|.
+id<GREYMatcher> Entry(NSString* username) {
+  return ButtonWithAccessibilityLabel(username);
+}
+
+// Matcher for the Edit button in Save Passwords view.
+id<GREYMatcher> EditButton() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_NAVIGATION_BAR_EDIT_BUTTON);
+}
+
+// Matcher for the Copy password button in Password Details view.
+id<GREYMatcher> CopyPasswordButton() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_SETTINGS_PASSWORD_COPY_BUTTON);
+}
+
+}  // namespace
+
+@interface MockReauthenticationModule : NSObject<ReauthenticationProtocol>
+
+@property(nonatomic, assign) BOOL shouldSucceed;
+
+@end
+
+@implementation MockReauthenticationModule
+
+@synthesize shouldSucceed = _shouldSucceed;
+
+- (BOOL)canAttemptReauth {
+  return YES;
+}
+
+- (void)attemptReauthWithLocalizedReason:(NSString*)localizedReason
+                                 handler:(void (^)(BOOL success))
+                                             showCopyPasswordsHandler {
+  showCopyPasswordsHandler(_shouldSucceed);
+}
+
+@end
+
+// Various tests for the Save Passwords section of the settings.
+@interface PasswordsSettingsTestCase : ChromeTestCase
+@end
+
+@implementation PasswordsSettingsTestCase
+
+// Return pref for saving passwords back to the passed value and restores the
+// experimental flag for viewing passwords.
+- (void)passwordsTearDown:(BOOL)defaultPasswordManagementSetting
+                         :(NSString*)oldExperiment {
+  ios::ChromeBrowserState* browserState =
+      chrome_test_util::GetOriginalBrowserState();
+  PrefService* preferences = browserState->GetPrefs();
+  preferences->SetBoolean(
+      password_manager::prefs::kPasswordManagerSavingEnabled,
+      defaultPasswordManagementSetting);
+
+  NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
+  [defaults setObject:oldExperiment forKey:@"EnableViewCopyPasswords"];
+}
+
+// Sets the preference to allow saving passwords and activates the flag to use
+// the new UI for viewing passwords in settings. Also, ensures that original
+// state is restored after the test ends.
+- (void)scopedEnablePasswordManagementAndViewingUI {
+  // Retrieve the original preference state.
+  ios::ChromeBrowserState* browserState =
+      chrome_test_util::GetOriginalBrowserState();
+  PrefService* preferences = browserState->GetPrefs();
+  bool defaultPasswordManagerSavingPref = preferences->GetBoolean(
+      password_manager::prefs::kPasswordManagerSavingEnabled);
+
+  // Retrieve the experiment setting.
+  NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
+  NSString* oldSetting = [defaults stringForKey:@"EnableViewCopyPasswords"];
+
+  // Ensure restoring that on tear-down.
+  __weak PasswordsSettingsTestCase* weakSelf = self;
+  [self setTearDownHandler:^{
+    [weakSelf passwordsTearDown:defaultPasswordManagerSavingPref:oldSetting];
+  }];
+
+  // Enable saving.
+  preferences->SetBoolean(
+      password_manager::prefs::kPasswordManagerSavingEnabled, true);
+
+  // Enable viewing passwords in settings.
+  [defaults setObject:@"Enabled" forKey:@"EnableViewCopyPasswords"];
+}
+
+- (scoped_refptr<password_manager::PasswordStore>)passwordStore {
+  // ServiceAccessType governs behaviour in Incognito: only modifications with
+  // EXPLICIT_ACCESS, which correspond to user's explicit gesture, succeed.
+  // This test does not deal with Incognito, so the value of the argument is
+  // irrelevant.
+  return IOSChromePasswordStoreFactory::GetForBrowserState(
+      chrome_test_util::GetOriginalBrowserState(),
+      ServiceAccessType::EXPLICIT_ACCESS);
+}
+
+// Saves an example form in the store.
+- (void)saveExamplePasswordForm {
+  PasswordForm example;
+  example.username_value = base::ASCIIToUTF16("user");
+  example.password_value = base::ASCIIToUTF16("password");
+  example.origin = GURL("https://example.com");
+  example.signon_realm = example.origin.spec();
+
+  [self passwordStore]->AddLogin(example);
+  // Allow the PasswordStore to process this on the DB thread.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Removes all credentials stored.
+- (void)clearPasswordStore {
+  [self passwordStore]->RemoveLoginsCreatedBetween(base::Time(), base::Time(),
+                                                   base::Closure());
+  // Allow the PasswordStore to process this on the DB thread.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Opens the passwords page from the NTP. It requires no menus to be open.
+- (void)openPasswordSettings {
+  // Open settings and verify data in the view controller.
+  [ChromeEarlGreyUI openToolsMenu];
+  [[EarlGrey selectElementWithMatcher:SettingsButton()]
+      performAction:grey_tap()];
+  [[EarlGrey selectElementWithMatcher:PasswordsButton()]
+      performAction:grey_tap()];
+
+  // Wait for UI components to finish loading.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Tap back arrow, to get one level higher in settings.
+- (void)tapBackArrow {
+  [[EarlGrey
+      selectElementWithMatcher:grey_allOf(
+                                   grey_accessibilityID(@"ic_arrow_back"),
+                                   grey_accessibilityTrait(
+                                       UIAccessibilityTraitButton),
+                                   nil)] performAction:grey_tap()];
+
+  // Wait for UI components to finish loading.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Tap Edit in any settings view.
+- (void)tapEdit {
+  [[EarlGrey selectElementWithMatcher:EditButton()] performAction:grey_tap()];
+
+  // Wait for UI components to finish loading.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Tap Done in any settings view.
+- (void)tapDone {
+  [[EarlGrey selectElementWithMatcher:NavigationBarDoneButton()]
+      performAction:grey_tap()];
+
+  // Wait for UI components to finish loading.
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+}
+
+// Verifies the UI elements are accessible on the Passwords page.
+// TODO(crbug.com/159166): This differs from testAccessibilityOnPasswords in
+// settings_egtest.mm in that here this tests the new UI (for viewing
+// passwords), where in settings_egtest.mm the default (old) UI is tested.
+// Once the new is the default, just remove the test in settings_egtest.mm.
+- (void)testAccessibilityOnPasswords {
+  [self scopedEnablePasswordManagementAndViewingUI];
+
+  // Saving a form is needed for using the "password details" view.
+  [self saveExamplePasswordForm];
+
+  [self openPasswordSettings];
+  chrome_test_util::VerifyAccessibilityForCurrentScreen();
+
+  [self tapEdit];
+  chrome_test_util::VerifyAccessibilityForCurrentScreen();
+  [self tapDone];
+
+  // Inspect "password details" view.
+  [[EarlGrey selectElementWithMatcher:Entry(@"https://example.com, user")]
+      performAction:grey_tap()];
+  chrome_test_util::VerifyAccessibilityForCurrentScreen();
+  [self tapBackArrow];
+
+  [self tapBackArrow];
+  [self tapDone];
+  [self clearPasswordStore];
+}
+
+// Checks that attempts to copy a password provide appropriate feedback,
+// both when reauthentication succeeds and when it fails.
+- (void)testCopyPasswordToast {
+  [self scopedEnablePasswordManagementAndViewingUI];
+
+  // Saving a form is needed for using the "password details" view.
+  [self saveExamplePasswordForm];
+
+  [self openPasswordSettings];
+
+  [[EarlGrey selectElementWithMatcher:Entry(@"https://example.com, user")]
+      performAction:grey_tap()];
+
+  // Get the PasswordDetailsCollectionViewController and replace the
+  // reauthentication module with a fake one to avoid being blocked with a
+  // reauth prompt.
+  MockReauthenticationModule* reauth =

[sdefresne, 2017/05/02 15:30:08]

I think that the styleguide discourage uses of abbreviations for variable names.
Maybe use "reauthentication_module", "settings_navigation_controller",
"password_details_collection_view_controller".

[vabr (Chromium), 2017/05/03 05:41:37]

Good point, done.

+      [[MockReauthenticationModule alloc] init];
+  SettingsNavigationController* snc =
+      base::mac::ObjCCastStrict<SettingsNavigationController>(
+          top_view_controller::TopPresentedViewController());
+  PasswordDetailsCollectionViewController* pdcvc =
+      base::mac::ObjCCastStrict<PasswordDetailsCollectionViewController>(
+          snc.topViewController);
+  [pdcvc setReauthenticationModule:reauth];
+
+  // Check the snackbar in case of successful reauthentication.
+  reauth.shouldSucceed = YES;
+  [[EarlGrey selectElementWithMatcher:CopyPasswordButton()]
+      performAction:grey_tap()];
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+  NSString* snackbarLabel =
+      l10n_util::GetNSString(IDS_IOS_SETTINGS_PASSWORD_WAS_COPIED_MESSAGE);
+  [[EarlGrey selectElementWithMatcher:grey_accessibilityLabel(snackbarLabel)]
+      assertWithMatcher:grey_notNil()];
+
+  // Check the snackbar in case of failed reauthentication.
+  reauth.shouldSucceed = NO;
+  [[EarlGrey selectElementWithMatcher:CopyPasswordButton()]
+      performAction:grey_tap()];
+  [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
+  snackbarLabel =
+      l10n_util::GetNSString(IDS_IOS_SETTINGS_PASSWORD_WAS_NOT_COPIED_MESSAGE);
+  [[EarlGrey selectElementWithMatcher:grey_accessibilityLabel(snackbarLabel)]
+      assertWithMatcher:grey_notNil()];
+
+  [self tapBackArrow];
+  [self tapBackArrow];
+  [self tapDone];
+  [self clearPasswordStore];
+}
+
+@end