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(",not exist, Arial");
+  EXPECT_EQ("Arial", settings.standard());
+
+  // Otherwise returns any strings as they were set.
+  AtomicString nonLists[] = {
+      "Arial", "not exist", "not exist, Arial",
+  };
+  for (const AtomicString& name : nonLists) {
+    settings.updateStandard(name);
+    EXPECT_EQ(name, settings.standard());
+  }
+}
+
+}  // namespace blink