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

third_party/WebKit/Source/platform/fonts/GenericFontFamilySettingsTest.cpp

+// 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 "platform/fonts/GenericFontFamilySettings.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(GenericFontFamilySettingsTest, FirstAvailableFontFamily) {
+  GenericFontFamilySettings settings;
+  EXPECT_TRUE(settings.standard().isEmpty());
+
+  // Returns the first available font if starts with ",".
+  settings.updateStandard(",does not exist, Arial");
+  EXPECT_EQ("Arial", settings.standard());
+
+  // Otherwise returns any strings as they were set.
+  settings.updateStandard("Arial");
+  EXPECT_EQ("Arial", settings.standard());
+  settings.updateStandard("does not exist");
+  EXPECT_EQ("does not exist", settings.standard());
+  settings.updateStandard("does not exist, Arial");
+  EXPECT_EQ("does not exist, Arial", settings.standard());
+}
+
+}  // namespace blink