<!DOCTYPE html>
<html>
<head>
<script src="../../http/tests/inspector/resources/inspector-test.js"></script>
<script>
function load() {
    window.context2d = document.createElement("canvas").getContext("2d");

    runTest();
}

function test() {
    let suite = InspectorTest.createAsyncSuite("Canvas.requestClientNodes");

    suite.addTestCase({
        name: "Canvas.requestClientNodes.Initial",
        description: "Check that creating a CSS canvas client node is tracked correctly.",
        test(resolve, reject) {
            let canvas = WI.canvasManager.canvases[0];
            InspectorTest.assert(canvas, "There should be at least one canvas.");

            canvas.requestClientNodes((clientNodes) => {
                InspectorTest.expectEqual(clientNodes.length, 0, "There should initially be no client nodes.");
                resolve();
            });
        }
    });

    suite.addTestCase({
        name: "Canvas.CSSCanvasClients.InvalidCanvasId",
        description: "Invalid canvas identifiers should cause an error.",
        test(resolve, reject) {
            const canvasId = "DOES_NOT_EXIST";
            CanvasAgent.requestClientNodes(canvasId, (error, clientNodeIds) => {
                InspectorTest.expectThat(error, "Should produce an error.");
                InspectorTest.log("Error: " + error);
                resolve();
            });
        }
    });

    suite.runTestCasesAndFinish();
}
</script>
</head>
<body onload="load()">
    <p>Test that CanvasAgent tracks changes in the client nodes of a CSS canvas.</p>
</body>
</html>