Add fabric.Pattern tests

test.js

@@ -25,7 +25,8 @@ testrunner.run({
       './test/unit/parser.js',
       './test/unit/canvas.js',
       './test/unit/canvas_static.js',
-      './test/unit/gradient.js'
+      './test/unit/gradient.js',
+      './test/unit/pattern.js'
     ]
 }, function(err, report) {
   if(report.failed > 0){

test/unit/pattern.js

@@ -0,0 +1,77 @@
+(function() {
+
+  function createImageElement() {
+    return fabric.isLikelyNode ? new (require('canvas').Image) : fabric.document.createElement('img');
+  }
+  function setSrc(img, src, callback) {
+    if (fabric.isLikelyNode) {
+      require('fs').readFile(src, function(err, imgData) {
+        if (err) throw err;
+        img.src = imgData;
+        img._src = src;
+        callback && callback();
+      });
+    }
+    else {
+      img.src = src;
+      callback && callback();
+    }
+  }
+
+  QUnit.module('fabric.Pattern');
+
+  var img = createImageElement();
+  setSrc(img, fabric.isLikelyNode ?
+    (__dirname + '/../fixtures/greyfloral.png')
+    : '../fixtures/greyfloral.png');
+
+  function createPattern() {
+    return new fabric.Pattern({
+      source: img
+    });
+  }
+
+  test('constructor', function() {
+    ok(fabric.Pattern);
+
+    var pattern = createPattern();
+    ok(pattern instanceof fabric.Pattern, 'should inherit from fabric.Pattern');
+  });
+
+  test('properties', function() {
+    var pattern = createPattern();
+
+    equal(pattern.source, img);
+    equal(pattern.repeat, 'repeat');
+  });
+
+  test('toObject', function() {
+    var pattern = createPattern();
+
+    ok(typeof pattern.toObject == 'function');
+
+    var object = pattern.toObject();
+
+    // node-canvas doesn't give <img> "src"
+    if (img.src) {
+      equal(object.source, '../fixtures/greyfloral.png');
+    }
+    equal(object.repeat, 'repeat');
+
+    var sourceExecuted;
+    var patternWithGetSource = new fabric.Pattern({
+      source: function() {return fabric.document.createElement("canvas")}
+    });
+
+    var object2 = patternWithGetSource.toObject();
+    equal(object2.source, 'return fabric.document.createElement("canvas")');
+    equal(object2.repeat, 'repeat');
+  });
+
+  test('toLive', function() {
+    var pattern = createPattern();
+
+    ok(typeof pattern.toLive == 'function');
+  });
+
+})();