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description("Series of tests to ensure stroke() works with optional path parameter.");
var ctx = document.getElementById('canvas').getContext('2d');
function pixelDataAtPoint() {
return ctx.getImageData(75, 75, 1, 1).data;
}
function checkResult(expectedColors, sigma) {
for (var i = 0; i < 4; i++)
shouldBeCloseTo("pixelDataAtPoint()[" + i + "]", expectedColors[i], sigma);
}
function drawRectangleOn(contextOrPath) {
contextOrPath.rect(25, 25, 50, 50);
}
function formatName(path) {
return 'stroke(' + (path ? 'path' : '') + ')';
}
function testStrokeWith(path) {
debug('Testing ' + formatName(path));
ctx.fillStyle = 'rgb(255,0,0)';
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.strokeStyle = 'rgb(0,255,0)';
ctx.lineWidth = 5;
if (path) {
ctx.stroke(path);
} else {
ctx.beginPath();
drawRectangleOn(ctx);
ctx.stroke();
}
debug('');
checkResult([0, 255, 0, 255], 5);
}
// Execute test.
function prepareTestScenario() {
var path = new Path2D();
drawRectangleOn(path);
testStrokeWith();
testStrokeWith(path);
// Test exception cases.
shouldThrow("ctx.stroke(null)");
shouldThrow("ctx.stroke(undefined)");
shouldThrow("ctx.stroke([])");
shouldThrow("ctx.stroke({})");
}
// Run test and allow variation of results.
prepareTestScenario();
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