Added getImageData() unit test

test/canvas.test.js

@@ -303,5 +303,39 @@ module.exports = {
       assert.ok(!err);
       assert.ok(0 == str.indexOf('data:image/png;base64,'));
     });
+  },
+  
+  'test Context2d#getImageData()': function(assert){
+    var canvas = new Canvas(3, 6)
+      , ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = '#f00';
+    ctx.fillRect(0,0,1,6);
+    
+    ctx.fillStyle = '#0f0';
+    ctx.fillRect(1,0,1,6);
+
+    ctx.fillStyle = '#00f';
+    ctx.fillRect(2,0,1,6);
+
+    var imageData = ctx.getImageData(0,0,3,6);
+    assert.equal(3, imageData.width);
+    assert.equal(6, imageData.height);
+    assert.equal(3 * 6 * 4, imageData.data.length);
+    
+    assert.equal(255, imageData.data[0]);
+    assert.equal(0, imageData.data[1]);
+    assert.equal(0, imageData.data[2]);
+    assert.equal(255, imageData.data[3]);
+    
+    assert.equal(0, imageData.data[4]);
+    assert.equal(255, imageData.data[5]);
+    assert.equal(0, imageData.data[6]);
+    assert.equal(255, imageData.data[7]);
+    
+    assert.equal(0, imageData.data[8]);
+    assert.equal(0, imageData.data[9]);
+    assert.equal(255, imageData.data[10]);
+    assert.equal(255, imageData.data[11]);
   }
 }