how to fix 404 warnings for images during karma unit testing

Question

I'm unit testing one of my directives (angularjs) using grunt/karma/phantomjs/jasmine. My tests run fine

describe('bar foo', function () {
    beforeEach(inject(function ($rootScope, $compile) {
        elm = angular.element('<img bar-foo src="img1.png"/>');
        scope = $rootScope.$new();
        $compile(elm)();
        scope.$digest();
    }));
    ....
});

but I do get these 404s

WARN [web-server]: 404: /img1.png
WARN [web-server]: 404: /img2.png
...

Although they do nothing, they do add noise to the log output. Is there a way to fix this ? (without changing karma's logLevel of course, because I do want to see them)

Answer 1

That is because you need to configurate karma to load then serve them when requested ;)

In your karma.conf.js file you should already have defined files and/or patterns like :

// list of files / patterns to load in the browser
files : [
  {pattern: 'app/lib/angular.js', watched: true, included: true, served: true},
  {pattern: 'app/lib/angular-*.js', watched: true, included: true, served: true},
  {pattern: 'app/lib/**/*.js', watched: true, included: true, served: true},
  {pattern: 'app/js/**/*.js', watched: true, included: true, served: true},
  // add the line below with the correct path pattern for your case
  {pattern: 'path/to/**/*.png', watched: false, included: false, served: true},
  // important: notice that "included" must be false to avoid errors
  // otherwise Karma will include them as scripts
  {pattern: 'test/lib/**/*.js', watched: true, included: true, served: true},
  {pattern: 'test/unit/**/*.js', watched: true, included: true, served: true},
],

// list of files to exclude
exclude: [

],

// ...

You can have a look here for more info :)

EDIT : If you use a nodejs web-server to run your app, you can add this to karma.conf.js :

proxies: {
  '/path/to/img/': 'http://localhost:8000/path/to/img/'
},

EDIT2 : If you don't use or want to use another server you can define a local proxy but as Karma doesn't provide access to port in use, dynamically, if karma starts on another port than 9876 (default), you will still get those annoying 404...

proxies =  {
  '/images/': '/base/images/'
};

Related issue : https://github.com/karma-runner/karma/issues/872