Add unit test for SVG path parsing

third_party/WebKit/Source/core/svg/SVGPathStringSource.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 14 matching lines @@
 #include "platform/geometry/FloatPoint.h"
 
 namespace blink {
 
 SVGPathStringSource::SVGPathStringSource(const String& string)
     : m_string(string)
     , m_is8BitSource(string.is8Bit())
     , m_seenError(false)
     , m_previousCommand(PathSegUnknown)
 {
-    ASSERT(!string.isEmpty());
+    ASSERT(!string.isNull());
 
     if (m_is8BitSource) {
         m_current.m_character8 = string.characters8();
         m_end.m_character8 = m_current.m_character8 + string.length();
     } else {
         m_current.m_character16 = string.characters16();
         m_end.m_character16 = m_current.m_character16 + string.length();
     }
     eatWhitespace();
 }
@@ skipping 182 matching lines @@
     case PathSegUnknown:
         ASSERT_NOT_REACHED();
     }
 
     if (UNLIKELY(m_seenError))
         segment.command = PathSegUnknown;
     return segment;
 }
 
 } // namespace blink