paper.js/test/tests/Point.js

module('Point');
test('new Point(10, 20)', function() {
	var point = new Point(10, 20);
	equals(point.toString(), '{ x: 10, y: 20 }');
});

test('new Point([10, 20])', function() {
	var point = new Point([10, 20]);
	equals(point.toString(), '{ x: 10, y: 20 }');
});

test('new Point({x: 10, y: 20})', function() {
	var point = new Point({x: 10, y: 20});
	equals(point.toString(), '{ x: 10, y: 20 }');
});

test('new Point(new Size(10, 20))', function() {
	var point = new Point(new Size(10, 20));
	equals(point.toString(), '{ x: 10, y: 20 }');
});

test('new Point({ width: 10, height: 20})', function() {
	var point = new Point({width: 10, height: 20});
	equals(point.toString(), '{ x: 10, y: 20 }');
});

test('new Point({ angle: 45, length: 20})', function() {
	var point = new Point({angle: 40, length: 20});
	equals(point.toString(), '{ x: 15.32089, y: 12.85575 }');
});

module('Point vector operations');

test('normalize(length)', function() {
	var point = new Point(0, 10).normalize(20)
	equals(point.toString(), '{ x: 0, y: 20 }');
});

test('set length', function() {
	var point = new Point(0, 10);
	point.length = 20;
	equals(point.toString(), '{ x: 0, y: 20 }');
});

test('get angle', function() {
	var angle = new Point(0, 10).angle;
    equals(angle, 90);
});

test('getAngle(point)', function() {
	var angle = new Point(0, 10).getAngle([10, 10]);
    equals(Math.round(angle), 45);
});

test('rotate(degrees)', function() {
	var point = new Point(100, 50).rotate(90);
	equals(point.toString(), '{ x: -50, y: 100 }');
});

test('set angle', function() {
	var point = new Point(10, 20);
	point.angle = 92;
    equals(point.angle, 92);
});

test('getDirectedAngle(point)', function() {
	var angle = new Point().getDirectedAngle(new Point(10, 10));
	equals(angle, -45);
});