Excalibur Jasmine Matchers

This library is built to help test excalibur, and games made with excalibur.

These matchers are only supported in a browser context.

Installation

npm install excalibur-jasmine --save-dev --save-exact

In your jasmine test file

import { ExcaliburMatchers, ExcaliburAsyncMatchers } from 'excalibur-jasmine';
import * as ex from 'excalibur';

describe('A new thingy', () => {
    beforeAll(() => {
        jasmine.addMatchers(ExcaliburMatchers);
        jasmine.addAsyncMatchers(ExcaliburAsyncMatchers);
    });
    
    it('should be fast', () => {
      ...
    });
    
});

Using image matchers with karma, you will want to add a proxy to smooth over /base/ this repo is a good example of how to configure it.

proxies: {
  // smooths over loading files because karma prepends '/base/' to everything
  '/src/' : '/base/src/',
  '/test-images/': '/base/test-images/'
},

Async Matchers

New and improved toEqualImage

Now with jasmine async matchers you can remove a lot of the old boilerplate need to match images!

import { ExcaliburAsyncMatchers } from 'excalibur-jasmine'

describe('A new thingy', () => {
    beforeAll(() => {
        jasmine.addAsyncMatchers(ExcaliburAsyncMatchers);
    });
    
    it('should match images', async () => {
      let engine = new ex.Engine({width: 100, height: 100});
      await expectAsync(engine.canvas).toEqualImage('images/expectedcanvas.png', .99);
    });
    
});

Matchers

toEqualImage

For loading images, there is a helper called ensureImagesLoaded that will ensure that any image resources are loaded into the test before comparing them.

import { ExcaliburMatchers, ExcaliburAsyncMatchers, ensureImagesLoaded } from 'excalibur-jasmine'
import * as ex from 'excalibur';

describe('A new thingy', () => {
    beforeAll(() => {
        jasmine.addMatchers(ExcaliburMatchers);
        jasmine.addAsyncMatchers(ExcaliburAsyncMatchers);
    });
    
    it('should match images', (done) => {
      let engine = new ex.Engine({width: 100, height: 100});
      ensureImagesLoaded(engine.canvas, 'images/expectedcanvas.png').then(([canvasImage, expectedImage]) => {
         expect(canvasImage).toEqualImage(expectedImage, .99);
         done()
      })
    });
    
});

toBeVector

This matcher is useful for comparing positions or velocities on objects in excalibur

import { ExcaliburMatchers, ensureImagesLoaded }
import * as ex from 'excalibur';

describe('A new thingy', () => {
    beforeAll(() => {
        jasmine.addMatchers(ExcaliburMatchers)
    });
    
    it('should be at position', () => {
      let actor = new ex.Actor({
        x: 1,
        y: 10
      });
      
      expect(actor.pos).toBeVector(new ex.Vector(1, 10));
    });
    
});

toHaveValues

This matcher is useful for checking bespoke properties on an actor

import { ExcaliburMatchers, ensureImagesLoaded }
import * as ex from 'excalibur';

describe('A new thingy', () => {
    beforeAll(() => {
        jasmine.addMatchers(ExcaliburMatchers)
    });
    
    it('should have values', () => {
      let actor = new ex.Actor({
        x: 1,
        y: 10,
        collisionType: ex.CollisionType.Fixed,
        color: ex.Color.Red
      });
      
      expect(actor).toHaveValues({
        x: 1,
        y: 10,
        collisionType: ex.CollisionType.Fixed,
        color: ex.Color.Red
      });
    });
    
});

excaliburjs/excalibur-jasmine