description("This tests behaviour of path modification APIs on an empty path.");
var canvas = document.createElement('canvas');
canvas.width=300;
canvas.height=300;
var ctx = canvas.getContext('2d');

function getColor(x,y) {
    var imageData = ctx.getImageData(x, y, 1, 1);
    var data = imageData.data;
    return [data[0], data[1], data[2], data[3]];
}

// Test no drawing cases
ctx.fillStyle = 'green';
ctx.strokeStyle = 'red';
ctx.lineWidth = 50;

debug("Test lineTo")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.lineTo(50, 50);
ctx.stroke();
shouldBe("getColor(40,40)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);

// Test when create rectangle path using a rectangle with width = height = 0.
debug("Test canvas.rect() with width = height = 0.");
ctx.strokeStyle = 'red';
ctx.lineWidth = 10;
ctx.beginPath();
ctx.rect(0, 0, 0, 0);
ctx.stroke();
shouldBe("getColor(1,1)", "[0,0,0,0]");
ctx.clearRect(0, 0, 300, 300);

// Test path modifications that result in drawing
ctx.fillStyle = 'red';
ctx.strokeStyle = 'green';

debug("Test lineTo sequence")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.lineTo(0, 50);
ctx.lineTo(100, 50);
ctx.stroke();
shouldBe("getColor(0,0)", "[255,0,0,255]");
shouldBe("getColor(50,50)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);

debug("Test quadraticCurveTo")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.quadraticCurveTo(0, 50, 100, 50);
ctx.stroke();
shouldBe("getColor(10,10)", "[255,0,0,255]");
shouldBe("getColor(50,50)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);

debug("Test quadraticCurveTo endpoint")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.quadraticCurveTo(0, 50, 100, 50);
ctx.lineTo(50, 100);
ctx.stroke();
shouldBe("getColor(10,10)", "[255,0,0,255]");
shouldBe("getColor(99,51)", "[0,128,0,255]");
shouldBe("getColor(50,50)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);

debug("Test bezierCurveTo")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.bezierCurveTo(0, 50, 50, 50, 100, 50);
ctx.stroke();
shouldBe("getColor(10,10)", "[255,0,0,255]");
shouldBe("getColor(50,50)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);

debug("Test bezierCurveTo endpoint")
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.bezierCurveTo(0, 50, 50, 50, 100, 50);
ctx.stroke();
ctx.lineTo(50, 100);
ctx.stroke();
shouldBe("getColor(10,10)", "[255,0,0,255]");
shouldBe("getColor(99,51)", "[0,128,0,255]");
shouldBe("getColor(50,50)", "[0,128,0,255]");
ctx.clearRect(0, 0, 300, 300);