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

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

 // Copyright 2014 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/FontCache.h"
 
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "public/platform/Platform.h"
@@ skipping 17 matching lines @@
   fontDescription.setGenericFamily(FontDescription::StandardFamily);
   RefPtr<SimpleFontData> fontData =
       fontCache->getLastResortFallbackFont(fontDescription, Retain);
   EXPECT_TRUE(fontData);
 
   fontDescription.setGenericFamily(FontDescription::SansSerifFamily);
   fontData = fontCache->getLastResortFallbackFont(fontDescription, Retain);
   EXPECT_TRUE(fontData);
 }
 
+TEST(FontCache, firstAvailableOrFirst) {
+  EXPECT_TRUE(FontCache::firstAvailableOrFirst("").isEmpty());
+  EXPECT_TRUE(FontCache::firstAvailableOrFirst(String()).isEmpty());
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("Arial"));
+  EXPECT_EQ("not exist", FontCache::firstAvailableOrFirst("not exist"));
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("Arial, not exist"));
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("not exist, Arial"));
+  EXPECT_EQ("Arial",
+            FontCache::firstAvailableOrFirst("not exist, Arial, not exist"));
+
+  EXPECT_EQ("not exist",
+            FontCache::firstAvailableOrFirst("not exist, not exist 2"));
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst(", not exist, Arial"));
+  EXPECT_EQ("not exist",
+            FontCache::firstAvailableOrFirst(", not exist, not exist"));
+}
+
 }  // namespace blink