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excalibur-jasmine

v0.3.4

Published

Jasmine matchers for testing excalibur

Downloads

630

Readme

Excalibur Jasmine Matchers

Build Status

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
      });
    });
    
});