test/node-test.js

import chai from 'chai';
chai.should();

import CircleNode from '../src/js/data/node/circle-node';

describe('CircleNode', () => {
  describe('#constructor', () => {
    it('should create instance of CircleNode', () => {
      new CircleNode(0, 0).should.be.instanceof(CircleNode);
    });
  });

  describe('#containsPoint', () => {
    it('should contain this point', () => {
      let tempNode = new CircleNode(1, 2);
      tempNode.containsPoint(10, 10).should.be.true;
    });
    it('should not contain this point', () => {
      let tempNode = new CircleNode(1, 2);
      tempNode.containsPoint(300, 200).should.be.false;
    });
  });

  describe('#distanceToPoint', () => {
    it('should do this distance calculation', () => {
      let tempNode = new CircleNode(1, 2);
      tempNode.distanceToPoint(3, 2).should.equal(2);
    });
    it('should do this simple distance calculation 2', () => {
      let tempNode = new CircleNode(1, 2);
      tempNode.distanceToPoint(3, 5).should.equal(Math.sqrt(4 + 9));
    });
    it('should do this negative point test', () => {
      let tempNode = new CircleNode(1, 2);
      tempNode.distanceToPoint(-1, 2).should.equal(2);
    });
  });

  describe('#edgePointInDirection', () => {
    it('should do this simple point check', () => {
      let tempNode = new CircleNode(1, 0);
      tempNode.edgePointInDirection(50, 0).x.should.equal(31);
      tempNode.edgePointInDirection(50, 0).y.should.equal(0);
    });
    it('should account for a point within the radius of the node', () => {
      let tempNode = new CircleNode(1, 0);
      tempNode.edgePointInDirection(20, 0).x.should.equal(31);
      tempNode.edgePointInDirection(-1, 0).x.should.equal(-29);
      tempNode.edgePointInDirection(20, 0).y.should.equal(0);
    });
    it('should throw error when point is at node origin', () => {
      (function () {
        let tempNode = new CircleNode(1, 0);
        tempNode.edgePointInDirection(1, 0);
      }).should.throw(Error);
    });
  });
});