third_party/blink/web_tests/fast/canvas-api/canvas-ImageData-behaviour.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function(t){

    imageData = document.createElement("canvas").getContext("2d").getImageData(0,0,2,2);
    
    assert_equals(imageData.width, 2);
    assert_equals(imageData.height, 2);
    assert_equals(imageData.data.length, 16);
    for (var i = 0; i < imageData.data.length; i++)
        assert_equals(imageData.data[i], 0);
    
    var testValues = [NaN, true, false, "\"garbage\"", "-1",
                      "0", "1", "2", Infinity, -Infinity,
                      -5, -0.5, 0, 0.5, 5,
                      5.4, 255, 256, null, undefined];
    var testResults = [0, 1, 0, 0, 0,
                       0, 1, 2, 255, 0,
                       0, 0, 0, 0, 5,
                       5, 255, 255, 0, 0];
    for (var i = 0; i < testValues.length; i++) {
        imageData.data[0] = testValues[i];
        assert_equals(imageData.data[0], testResults[i]);
    }
    
    imageData.data['foo']='garbage';
    assert_equals(imageData.data['foo'], 'garbage');
    imageData.data[-1]='garbage';
    assert_equals(imageData.data[-1], undefined);
    imageData.data[17]='garbage';
    assert_equals(imageData.data[17], undefined);
}, 'Series of tests to ensure correct behaviour of the ImageData object');
</script>