Leaflet/spec/suites/geometry/PointSpec.js

describe("Point", function () {

	describe('constructor', function () {

		it("creates a point with the given x and y", function () {
			var p = new L.Point(1.5, 2.5);
			expect(p.x).to.eql(1.5);
			expect(p.y).to.eql(2.5);
		});

		it("rounds the given x and y if the third argument is true", function () {
			var p = new L.Point(1.3, 2.7, true);
			expect(p.x).to.eql(1);
			expect(p.y).to.eql(3);
		});
	});

	describe('#subtract', function () {
		it('subtracts the given point from this one', function () {
			var a = new L.Point(50, 30),
			    b = new L.Point(20, 10);
			expect(a.subtract(b)).to.eql(new L.Point(30, 20));
		});
	});

	describe('#add', function () {
		it('adds given point to this one', function () {
			expect(new L.Point(50, 30).add(new L.Point(20, 10))).to.eql(new L.Point(70, 40));
		});
	});

	describe('#divideBy', function () {
		it('divides this point by the given amount', function () {
			expect(new L.Point(50, 30).divideBy(5)).to.eql(new L.Point(10, 6));
		});
	});

	describe('#multiplyBy', function () {
		it('multiplies this point by the given amount', function () {
			expect(new L.Point(50, 30).multiplyBy(2)).to.eql(new L.Point(100, 60));
		});
	});

	describe('#floor', function () {
		it('returns a new point with floored coordinates', function () {
			expect(new L.Point(50.56, 30.123).floor()).to.eql(new L.Point(50, 30));
		});
	});

	describe('#distanceTo', function () {
		it('calculates distance between two points', function () {
			var p1 = new L.Point(0, 30);
			var p2 = new L.Point(40, 0);
			expect(p1.distanceTo(p2)).to.eql(50.0);
		});
	});

	describe('#equals', function () {
		it('returns true if points are equal', function () {
			var p1 = new L.Point(20.4, 50.12);
			var p2 = new L.Point(20.4, 50.12);
			var p3 = new L.Point(20.5, 50.13);

			expect(p1.equals(p2)).to.be(true);
			expect(p1.equals(p3)).to.be(false);
		});
	});

	describe('#contains', function () {
		it('returns true if the point is bigger in absolute dimensions than the passed one', function () {
			var p1 = new L.Point(50, 30),
			    p2 = new L.Point(-40, 20),
			    p3 = new L.Point(60, -20),
			    p4 = new L.Point(-40, -40);

			expect(p1.contains(p2)).to.be(true);
			expect(p1.contains(p3)).to.be(false);
			expect(p1.contains(p4)).to.be(false);
		});
	});

	describe('#toString', function () {
		it('formats a string out of point coordinates', function () {
			expect(new L.Point(50, 30) + '').to.eql('Point(50, 30)');
			expect(new L.Point(50.1234567, 30.1234567) + '').to.eql('Point(50.123457, 30.123457)');
		});
	});

	describe('L.point factory', function () {
		it('leaves L.Point instances as is', function () {
			var p = new L.Point(50, 30);
			expect(L.point(p)).to.be(p);
		});
		it('creates a point out of three arguments', function () {
			expect(L.point(50.1, 30.1, true)).to.eql(new L.Point(50, 30));
		});
		it('creates a point from an array of coordinates', function () {
			expect(L.point([50, 30])).to.eql(new L.Point(50, 30));
		});
		it("creates a point from an object with x and y properties", function () {
			expect(L.point({x: 50, y: 30})).to.eql(new L.Point(50, 30));
		});
		it('does not fail on invalid arguments', function () {
			expect(L.point(undefined)).to.be(undefined);
			expect(L.point(null)).to.be(null);
		});
	});
});