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Vector.spec.js
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Vector.spec.js
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import { should } from 'chai';
import { expect } from 'chai';
should();
import Vector from '../src/Vector.js';
describe('Vector', function () {
describe('Vector()', function () {
it('should initialize Vector', function () {
let vec = new Vector();
vec.should.have.property('x');
vec.should.have.property('y');
vec.x.should.be.a('number');
vec.y.should.be.a('number');
expect(vec.x).to.equal(0);
expect(vec.y).to.equal(0);
})
it('should initialize Vector with parameters', function () {
let vec = new Vector(100, 100);
expect(vec.x).to.equal(100);
expect(vec.y).to.equal(100);
})
it('#setXY should set X and Y', function () {
let vec = new Vector(100, 100);
vec.setXY(512, 210)
expect(vec.x).to.equal(512);
expect(vec.y).to.equal(210);
})
it('#sub-static', function () {
let vec1 = new Vector(100, 100);
let vec2 = new Vector(100, 100);
let sub = Vector.sub(vec1, vec2);
sub.should.be.instanceOf(Vector);
expect(sub.x).to.equal(0);
expect(sub.y).to.equal(0);
})
it('#add-static', function () {
let vec1 = new Vector(100, 100);
let vec2 = new Vector(100, 100);
let add = Vector.add(vec1, vec2);
add.should.be.instanceOf(Vector);
expect(add.x).to.equal(200);
expect(add.y).to.equal(200);
})
it('#fromAngle-static', function () {
let vec = Vector.fromAngle(30);
vec.should.be.instanceOf(Vector);
vec.x.should.be.a('number');
vec.y.should.be.a('number');
})
it('#random2D-static', function () {
let vec = Vector.random2D(30);
vec.should.be.instanceOf(Vector);
vec.x.should.be.a('number');
vec.y.should.be.a('number');
})
it('#add should add a vector to itself', function () {
let vec = new Vector(100, 100);
vec.add(new Vector(100, 100));
expect(vec.x).to.equal(200);
expect(vec.y).to.equal(200);
vec.add(100, 100);
expect(vec.x).to.equal(300);
expect(vec.y).to.equal(300);
})
it('#sub should subtract a vector to itself', function () {
let vec = new Vector(300, 300);
vec.sub(new Vector(100, 100));
expect(vec.x).to.equal(200);
expect(vec.y).to.equal(200);
vec.sub(100, 100);
expect(vec.x).to.equal(100);
expect(vec.y).to.equal(100);
})
it('#mult should multiply a vector to itself or a scalar value', function () {
let vec = new Vector(100, 100);
vec.mult(new Vector(2, 2));
expect(vec.x).to.equal(200);
expect(vec.y).to.equal(200);
vec.mult(2);
expect(vec.x).to.equal(400);
expect(vec.y).to.equal(400);
})
it('#div should divide a vector to itself or a scalar value', function () {
let vec = new Vector(200, 200);
vec.div(new Vector(2, 2));
expect(vec.x).to.equal(100);
expect(vec.y).to.equal(100);
vec.div(2);
expect(vec.x).to.equal(50);
expect(vec.y).to.equal(50);
})
it('#limit should limit the vector', function () {
let vec = new Vector(-100, 200);
vec.limit(100);
expect(vec.mag()).to.closeTo(100, 0.1);
})
it('#dist should return distance between given vector', function () {
let vec1 = new Vector(100, 200);
let vec2 = new Vector(200, 200);
let dist = vec1.dist(vec2);
expect(dist).to.be.equal(100);
vec1 = new Vector(150, 200);
vec2 = new Vector(200, 200);
dist = vec1.dist(vec2);
expect(dist).to.be.equal(50);
})
it('#distSq should return sqr distance between given vector', function () {
let vec1 = new Vector(100, 200);
let vec2 = new Vector(200, 200);
let dist = vec1.distSq(vec2);
expect(dist).to.be.equal(10000);
vec1 = new Vector(150, 200);
vec2 = new Vector(200, 200);
dist = vec1.distSq(vec2);
expect(dist).to.be.equal(2500);
})
it('#negative should negate the vector', function () {
let vec1 = new Vector(100, 200).negative();
expect(vec1.x).to.be.equal(-100);
expect(vec1.y).to.be.equal(-200);
})
})
});