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QUnit.extend( QUnit, {
pixelEqual: function(canvas, x, y, r, g, b, a, message) {
var actual = Array.prototype.slice.apply(canvas.getContext('2d').getImageData(x, y, 1, 1).data), expected = [r, g, b, a];
QUnit.push(QUnit.equiv(actual, expected), actual, expected, message);
}
});
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