Allow the default generic font family settings to find the first available font

chrome/browser/ui/webui/options/font_settings_utils_unittest.cc

+// Copyright 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/webui/options/font_settings_utils.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace options {
+
+TEST(FontSettingsUtilitiesTest, ResolveFontList) {
+  EXPECT_TRUE(FontSettingsUtilities::ResolveFontList("").empty());
+
+  // Returns the first available font if starts with ",".
+  EXPECT_EQ("Arial",
+            FontSettingsUtilities::ResolveFontList(",not exist, Arial"));
+
+  // Returns the first font if no fonts are available.
+  EXPECT_EQ("not exist",
+            FontSettingsUtilities::ResolveFontList(",not exist, not exist 2"));
+
+  // Otherwise returns any strings as they were set.
+  std::string non_lists[] = {
+      "Arial", "not exist", "not exist, Arial",
+  };
+  for (const std::string& name : non_lists)
+    EXPECT_EQ(name, FontSettingsUtilities::ResolveFontList(name));
+}
+
+}  // namespace options