Add a test for empty arcs

test/example/emptyArc.js

@@ -0,0 +1,12 @@
+window.C2S_EXAMPLES['emptyArc'] = function(ctx) {
+
+    // Draw shapes
+    for (i = 0; i < 4; i++) {
+        for (j = 0; j < 3; j++) {
+            ctx.beginPath();
+            ctx.arc(100, 100, 100, Math.PI, Math.PI);
+            ctx.fill();
+        }
+    }
+    
+};

test/playground.html

@@ -20,7 +20,7 @@
         <div class="row">
             <div class="twelve columns">
                 <!-- select content is generated by the command `gulp update_examples` -->
-                <select id="select" class="u-full-width"><option value="arc">arc</option><option value="arcTo">arcTo</option><option value="arcTo2">arcTo2</option><option value="fillstyle">fillstyle</option><option value="globalalpha">globalalpha</option><option value="gradient">gradient</option><option value="linecap">linecap</option><option value="linewidth">linewidth</option><option value="rgba">rgba</option><option value="saveandrestore">saveandrestore</option><option value="text">text</option><option value="tiger">tiger</option></select>
+                <select id="select" class="u-full-width"><option value="arc">arc</option><option value="arcTo">arcTo</option><option value="arcTo2">arcTo2</option><option value="emptyArc">emptyArc</option><option value="fillstyle">fillstyle</option><option value="globalalpha">globalalpha</option><option value="gradient">gradient</option><option value="linecap">linecap</option><option value="linewidth">linewidth</option><option value="rgba">rgba</option><option value="saveandrestore">saveandrestore</option><option value="text">text</option><option value="tiger">tiger</option></select>
             </div>
         </div>
     </form>
@@ -64,7 +64,7 @@
 </script>
 
 <!-- examples content is generated by the command `gulp update_examples` -->
-<div id="examples"><script type="text/javascript" src="example/arc.js"></script><script type="text/javascript" src="example/arcTo.js"></script><script type="text/javascript" src="example/arcTo2.js"></script><script type="text/javascript" src="example/fillstyle.js"></script><script type="text/javascript" src="example/globalalpha.js"></script><script type="text/javascript" src="example/gradient.js"></script><script type="text/javascript" src="example/linecap.js"></script><script type="text/javascript" src="example/linewidth.js"></script><script type="text/javascript" src="example/rgba.js"></script><script type="text/javascript" src="example/saveandrestore.js"></script><script type="text/javascript" src="example/text.js"></script><script type="text/javascript" src="example/tiger.js"></script></div>
+<div id="examples"><script type="text/javascript" src="example/arc.js"></script><script type="text/javascript" src="example/arcTo.js"></script><script type="text/javascript" src="example/arcTo2.js"></script><script type="text/javascript" src="example/emptyArc.js"></script><script type="text/javascript" src="example/fillstyle.js"></script><script type="text/javascript" src="example/globalalpha.js"></script><script type="text/javascript" src="example/gradient.js"></script><script type="text/javascript" src="example/linecap.js"></script><script type="text/javascript" src="example/linewidth.js"></script><script type="text/javascript" src="example/rgba.js"></script><script type="text/javascript" src="example/saveandrestore.js"></script><script type="text/javascript" src="example/text.js"></script><script type="text/javascript" src="example/tiger.js"></script></div>
 
 <script type="text/javascript">
     (function () {

test/testrunner.html

@@ -18,7 +18,7 @@
     var expect = chai.expect;
 </script>
 <!-- examples content is generated by the command `gulp update_examples` -->
-<div id="examples"><script type="text/javascript" src="example/arc.js"></script><script type="text/javascript" src="example/arcTo.js"></script><script type="text/javascript" src="example/arcTo2.js"></script><script type="text/javascript" src="example/fillstyle.js"></script><script type="text/javascript" src="example/globalalpha.js"></script><script type="text/javascript" src="example/gradient.js"></script><script type="text/javascript" src="example/linecap.js"></script><script type="text/javascript" src="example/linewidth.js"></script><script type="text/javascript" src="example/rgba.js"></script><script type="text/javascript" src="example/saveandrestore.js"></script><script type="text/javascript" src="example/text.js"></script><script type="text/javascript" src="example/tiger.js"></script></div>
+<div id="examples"><script type="text/javascript" src="example/arc.js"></script><script type="text/javascript" src="example/arcTo.js"></script><script type="text/javascript" src="example/arcTo2.js"></script><script type="text/javascript" src="example/emptyArc.js"></script><script type="text/javascript" src="example/fillstyle.js"></script><script type="text/javascript" src="example/globalalpha.js"></script><script type="text/javascript" src="example/gradient.js"></script><script type="text/javascript" src="example/linecap.js"></script><script type="text/javascript" src="example/linewidth.js"></script><script type="text/javascript" src="example/rgba.js"></script><script type="text/javascript" src="example/saveandrestore.js"></script><script type="text/javascript" src="example/text.js"></script><script type="text/javascript" src="example/tiger.js"></script></div>
 <script src="unit.spec.js"></script>
 <script src="example.spec.js"></script>
 <script>