Add browsertests for managed-guest sessions warnings

Added browsertests to test that the login screen warnings
for the managed-guest sessions are controlled via
ManagedGuestSessionPrivacyWarningsEnabled policy, which
was added by this CL crrev.com/c/2254605.

Bug: 1099648
Change-Id: I18b7d0b15ca13182ff62b3bc23d3378aa59ced3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270458
Commit-Queue: Aya Elsayed <ayaelattar@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783864}

ash/login/login_screen_test_api.cc

@@ -425,6 +425,16 @@ bool LoginScreenTestApi::IsExpandedPublicSessionAdvanced() {
   return expanded_test.advanced_view()->GetVisible();
 }
 
+bool LoginScreenTestApi::IsPublicSessionWarningShown() {
+  LockScreen::TestApi lock_screen_test(LockScreen::Get());
+  LockContentsView::TestApi lock_contents_test(
+      lock_screen_test.contents_view());
+  LoginExpandedPublicAccountView::TestApi expanded_test(
+      lock_contents_test.expanded_view());
+  return expanded_test.monitoring_warning_icon() &&
+         expanded_test.monitoring_warning_label();
+}
+
 // static
 void LoginScreenTestApi::ClickPublicExpandedAdvancedViewButton() {
   LockScreen::TestApi lock_screen_test(LockScreen::Get());

ash/public/cpp/login_screen_test_api.h

@@ -56,6 +56,7 @@ class ASH_PUBLIC_EXPORT LoginScreenTestApi {
   static bool HidePublicSessionExpandedPod();
   static bool IsPublicSessionExpanded();
   static bool IsExpandedPublicSessionAdvanced();
+  static bool IsPublicSessionWarningShown();
   static void ClickPublicExpandedAdvancedViewButton();
   static void ClickPublicExpandedSubmitButton();
   static void SetPublicSessionLocale(const std::string& locale);

chrome/browser/chromeos/policy/device_local_account_browsertest.cc

@@ -2222,6 +2222,52 @@ IN_PROC_BROWSER_TEST_F(DeviceLocalAccountTest, PolicyForExtensions) {
             *policy_service->GetPolicies(ns).GetValue("string"));
 }
 
+IN_PROC_BROWSER_TEST_F(DeviceLocalAccountTest, LoginWarningShown) {
+  UploadAndInstallDeviceLocalAccountPolicy();
+  AddPublicSessionToDevicePolicy(kAccountId1);
+
+  WaitForPolicy();
+
+  ExpandPublicSessionPod(false);
+
+  // Click the link that switches the pod to its advanced form. Verify that the
+  // pod switches from basic to advanced.
+  ash::LoginScreenTestApi::ClickPublicExpandedAdvancedViewButton();
+  ASSERT_TRUE(ash::LoginScreenTestApi::IsExpandedPublicSessionAdvanced());
+  ASSERT_TRUE(ash::LoginScreenTestApi::IsPublicSessionWarningShown());
+}
+
+class DeviceLocalAccountWarnings : public DeviceLocalAccountTest {
+  void SetUpInProcessBrowserTestFixture() override {
+    DeviceLocalAccountTest::SetUpInProcessBrowserTestFixture();
+    SetManagedSessionsWarningDisabled();
+  }
+
+  void SetManagedSessionsWarningDisabled() {
+    em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+    em::ManagedGuestSessionPrivacyWarningsProto* managed_sessions_warnings =
+        proto.mutable_managed_guest_session_privacy_warnings();
+    managed_sessions_warnings->set_enabled(false);
+    RefreshDevicePolicy();
+    ASSERT_TRUE(local_policy_mixin_.UpdateDevicePolicy(proto));
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(DeviceLocalAccountWarnings, NoLoginWarningShown) {
+  UploadAndInstallDeviceLocalAccountPolicy();
+  AddPublicSessionToDevicePolicy(kAccountId1);
+
+  WaitForPolicy();
+
+  ExpandPublicSessionPod(false);
+
+  // Click the link that switches the pod to its advanced form. Verify that the
+  // pod switches from basic to advanced.
+  ash::LoginScreenTestApi::ClickPublicExpandedAdvancedViewButton();
+  ASSERT_TRUE(ash::LoginScreenTestApi::IsExpandedPublicSessionAdvanced());
+  ASSERT_FALSE(ash::LoginScreenTestApi::IsPublicSessionWarningShown());
+}
+
 class ManagedSessionsTest : public DeviceLocalAccountTest {
  protected:
   class CertsObserver : public chromeos::PolicyCertificateProvider::Observer {