1 files changed, 85 insertions, 0 deletions
diff --git a/chromium/chrome/browser/signin/signin_ui_util_browsertest.cc b/chromium/chrome/browser/signin/signin_ui_util_browsertest.cc
new file mode 100644
index 00000000000..299e45539d6
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+++ b/chromium/chrome/browser/signin/signin_ui_util_browsertest.cc
@@ -0,0 +1,85 @@
+// Copyright 2021 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 CHROME_BROWSER_SIGNIN_SIGNIN_UI_UTIL_BROWSERTEST_CC_
+#define CHROME_BROWSER_SIGNIN_SIGNIN_UI_UTIL_BROWSERTEST_CC_
+
+#include "chrome/browser/signin/signin_ui_util.h"
+
+#include "base/callback_helpers.h"
+#include "base/test/bind.h"
+#include "build/buildflag.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "components/signin/public/base/signin_buildflags.h"
+#include "content/public/test/browser_test.h"
+
+#if !BUILDFLAG(ENABLE_DICE_SUPPORT)
+#error This file only contains DICE browser tests for now.
+#endif
+
+namespace signin_ui_util {
+
+class DiceSigninUiUtilBrowserTest : public InProcessBrowserTest {
+ public:
+  DiceSigninUiUtilBrowserTest() = default;
+  ~DiceSigninUiUtilBrowserTest() override = default;
+
+  Profile* CreateProfile() {
+    Profile* new_profile = nullptr;
+    base::RunLoop run_loop;
+    ProfileManager::CreateMultiProfileAsync(
+        u"test_profile", /*icon_index=*/0, /*is_hidden=*/false,
+        base::BindLambdaForTesting(
+            [&new_profile, &run_loop](Profile* profile,
+                                      Profile::CreateStatus status) {
+              ASSERT_NE(status, Profile::CREATE_STATUS_LOCAL_FAIL);
+              if (status == Profile::CREATE_STATUS_INITIALIZED) {
+                new_profile = profile;
+                run_loop.Quit();
+              }
+            }));
+    run_loop.Run();
+    return new_profile;
+  }
+
+ private:
+};
+
+// Tests that `ShowExtensionSigninPrompt()` doesn't crash when it cannot create
+// a new browser. Regression test for https://crbug.com/1273370.
+IN_PROC_BROWSER_TEST_F(DiceSigninUiUtilBrowserTest,
+                       ShowExtensionSigninPrompt_NoBrowser) {
+  Profile* new_profile = CreateProfile();
+
+  // New profile should not have any browser windows.
+  EXPECT_FALSE(chrome::FindBrowserWithProfile(new_profile));
+
+  ShowExtensionSigninPrompt(new_profile, /*enable_sync=*/true,
+                            /*email_hint=*/std::string());
+  // `ShowExtensionSigninPrompt()` creates a new browser.
+  Browser* browser = chrome::FindBrowserWithProfile(new_profile);
+  ASSERT_TRUE(browser);
+  EXPECT_EQ(1, browser->tab_strip_model()->count());
+
+  // Profile deletion closes the browser.
+  g_browser_process->profile_manager()->ScheduleProfileForDeletion(
+      new_profile->GetPath(), base::DoNothing());
+  ui_test_utils::WaitForBrowserToClose(browser);
+  EXPECT_FALSE(chrome::FindBrowserWithProfile(new_profile));
+
+  // `ShowExtensionSigninPrompt()` does nothing for deleted profile.
+  ShowExtensionSigninPrompt(new_profile, /*enable_sync=*/true,
+                            /*email_hint=*/std::string());
+  EXPECT_FALSE(chrome::FindBrowserWithProfile(new_profile));
+}
+
+}  // namespace signin_ui_util
+
+#endif  // CHROME_BROWSER_SIGNIN_SIGNIN_UI_UTIL_BROWSERTEST_CC_