[Cleanup] Factor out common code.

chrome/browser/ui/chrome_pages_unittest.cc

Index: chrome/browser/ui/chrome_pages_unittest.cc
diff --git a/chrome/browser/ui/chrome_pages_unittest.cc b/chrome/browser/ui/chrome_pages_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..30e440624ccc6c7ad8855b2a84782163263008a0
--- /dev/null
+++ b/chrome/browser/ui/chrome_pages_unittest.cc
@@ -0,0 +1,25 @@
+// Copyright (c) 2016 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 "chrome/browser/ui/chrome_pages.h"
+
+#include "chrome/common/url_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(ChromePagesTest, IsInternalPage) {
+  EXPECT_TRUE(chrome::IsInternalPage(GURL(chrome::kChromeUIDownloadsURL)));
+  EXPECT_TRUE(chrome::IsInternalPage(GURL(chrome::kChromeUIHistoryURL)));
+  EXPECT_TRUE(chrome::IsInternalPage(GURL(chrome::kChromeUINewTabURL)));
+  EXPECT_TRUE(chrome::IsInternalPage(GURL(chrome::kChromeUISettingsURL)));
+
+// Debugging URLs are not included.
+#if defined(OS_CHROMEOS)
+  EXPECT_FALSE(chrome::IsInternalPage(GURL(chrome::kChromeUIDiscardsURL)));
+#endif
+  EXPECT_FALSE(
+      chrome::IsInternalPage(GURL(chrome::kChromeUINetInternalsURL)));
+
+  // Prefix matches are included.
+  EXPECT_TRUE(
+      chrome::IsInternalPage(GURL("chrome://settings/fakeSetting")));
+}