Impact

This forum is read only and just serves as an archive. If you have any questions, please post them on github.com/phoboslab/impact

1 decade ago by 20goto10

I am trying to test my impact game with Jasmine. I added a canvas to the SpecRunner.html file, and imported impact.js and main.js.

I was able to get ig.version = "1.22" to test.

Now, how do I access the Game object and my other entities? I tried ig.Game, ig.game, ig.main, ig.MyGame and all show undefined or null.

Thanks for your help everyone.

1 decade ago by TommyBs

have you tried just MyGame?

1 decade ago by 20goto10

yes, same problem.

1 decade ago by quidmonkey

The issue is that all Impact instances are locked away within closures. If you take a look at MyGame, it's an ig.Class constructor. What you'll have to do is expose your game object to window within your game's init:
init: function () {
    // logic
    window.MyTestInstance = this;
}

1 decade ago by 20goto10

Didn't work. Any other ideas?

Thanks for your help.

1 decade ago by drhayes

Your spec file is going to have to mock out the Impact module functions: ig.module, .requires, and .defines. Don't worry too much about what gets passed to ig.module and .requires. Call the function that gets passed to .defines and you've got your Entity (or whatever) globally available.

Here's a test file I wrote for my Event Chain library. See how I mocked module, requires, and define? That should work for you, too.

Everything in Impact ends up being global, one way or another. When you declare an entity like this:

BadGuyEntity = ig.Entity.extend({...

See how there's no var at the beginning? Boom, global variable.

Since almost everything in Impact works like that, you'll have to mock anything your entity (or whatever you're testing) needs, expose it globally, then call the function passed to defines... and, only then, start your tests.

Make sense?

1 decade ago by 20goto10

drhayes, you are a Java Ninja, but I still don't fully understand. Your explanation is perfect, but I am novice+ at javascript.

First, if BadGuyEntity is global anyway, why can't I see it without having to do anything in the first place?

I will look at the excellent code you provided and try to figure it out.

Thank you so much for your help.

1 decade ago by drhayes

Hey, if the explanation was perfect then novices would get it the first time. The burden's on me, don't worry about it. ( =

It's only global once the function you pass to defines has executed. But let me back up a bit...

Do you know JS? You know how, normally, everything you define in a JS file and include in a <script> tag is exposed to everything else? Dominic (the guy who wrote Impact) is trying to fix that. That's why you have to ig.module and .requires and .defines in all your files. That way, Impact can start with your game file and then "walk around" looking at all the files in your game's .requires list in order to figure out what it needs to load next... and then, before loading those, it looks in their .requires lists... and on and on until everything is loaded.

That brings us back to the file you're trying to test... and good on you for testing, BTW.

In Impact, the engine won't run the function you pass to defines until it has satisfied all the requires. Only once that function runs will the global be defined.

You don't want to do that in your test, though. You just want to test what you want to test... which is why you need to figure out how to run the function passed to defines. That's what this line does. Only once that function has run will the stuff that's defined inside of it be exposed globally (because of the missing var, right?).

Make sense?

1 decade ago by 20goto10

I think I got it. You must be good if you can teach an idiot like me. :-)

Thanks again for your help.

1 decade ago by Ashkettle

Jasmine is all well and good, but are you aware that QUnit has the ability to test pixels in canvas? That's compelling...

1 decade ago by 20goto10

oh heck Ashkettle, now I have to go learn something else. :=)

Thanks for the info.
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