Added simple test

#79

test/runner.html

@@ -49,6 +49,7 @@
     <script src="../src/filters/Blur.js" data-cover></script>
     <script src="../src/filters/Mask.js" data-cover></script>
     <script src="../src/filters/RGB.js" data-cover></script>
+    <script src="../src/filters/RGBA.js" data-cover></script>
     <script src="../src/filters/HSV.js" data-cover></script>
     <script src="../src/filters/HSL.js" data-cover></script>
     <script src="../src/filters/Emboss.js" data-cover></script>
@@ -154,6 +155,7 @@
     <script src="unit/filters/Blur-test.js"></script>
     <script src="unit/filters/Brighten-test.js"></script>
     <script src="unit/filters/RGB-test.js"></script>
+    <script src="unit/filters/RGBA-test.js"></script>
     <script src="unit/filters/HSV-test.js"></script>
     <script src="unit/filters/HSL-test.js"></script>
     <script src="unit/filters/Invert-test.js"></script>

test/unit/filters/RGBA-test.js

@@ -0,0 +1,78 @@
+suite('RGBA', function() {
+    // ======================================================
+    test('colorize basic', function(done) {
+        var data = [
+            {
+                color: '#ff0000',
+                filter: [170, 170, 170, 0.5],
+                // Actually 212 but in tests rounding half up
+                result: [213, 85, 85, 255]
+            },
+            {
+                color: '#2a6511',
+                filter: [242, 193, 168, 0.33],
+                result: [108, 131, 67, 255]
+            },
+            {
+                color: '#e4d526',
+                filter: [175, 98, 37, 0.79],
+                result: [186, 122, 37, 255]
+            },
+        ];
+
+        var stage = new Konva.Stage({
+            container: 'konva-container',
+            width: data.length,
+            height: 1
+        });
+
+        var layer = new Konva.Layer({
+            id: 'layer'
+        });
+
+        for (var i = 0; i < data.length; i += 1) {
+            var d = data[i];
+
+            var rect = new Konva.Rect({
+              x: i,
+              y: 0,
+              width: 1,
+              height: 1,
+              fill: d.color
+            });
+
+            rect.cache();
+
+            rect.red(d.filter[0]);
+            rect.green(d.filter[1]);
+            rect.blue(d.filter[2]);
+            rect.alpha(d.filter[3]);
+
+            rect.filters([Konva.Filters.RGBA]);
+            layer.add(rect);
+        }
+
+        stage.add(layer);
+        layer.batchDraw();
+
+        var context = layer.getCanvas().getContext();
+
+        var imageDataToArray = function (x) {
+            var imageData = context.getImageData(x, 0, 1, 1).data;
+
+            return [
+                imageData['0'], imageData['1'], imageData['2'], imageData['3']
+            ];
+        };
+
+        var a0 = imageDataToArray(0);
+        var a1 = imageDataToArray(1);
+        var a2 = imageDataToArray(2);
+
+        assert.deepEqual(a0, data[0].result);
+        assert.deepEqual(a1, data[1].result);
+        assert.deepEqual(a2, data[2].result);
+
+        done();
+    });
+});