Testing Fab.js with Vows.js

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Last night, I got vows.js setup and running a dummy test. Tonight I would like to run it against the player_from_querystring fab.js app in my (fab) game.

In my "just_playing" suite, I require the player_from_querystring app:

var vows = require('vows'),
    assert = require('assert');

var player_from_querystring = require('player_from_querystring').app;

var suite = vows.describe('just_playing');

That does not work, though:

cstrom@whitefall:~/repos/my_fab_game$ vows
module:238
        throw new Error("Cannot find module '" + request + "'");
              ^
Error: Cannot find module 'player_from_querystring'
    at loadModule (module:238:15)
    at require (module:364:12)
    at Object.<anonymous> (/home/cstrom/repos/my_fab_game/test/just_playing.js:4:31)
    at Module._compile (module:384:23)
    at Module._loadScriptSync (module:393:16)
    at Module.loadSync (module:296:10)
    at loadModule (module:241:16)
    at require (module:364:12)
    at /home/cstrom/bin/vows:326:19
    at Array.reduce (native)

Changing the require statement to require('lib/player_from_querystring') (the fab apps are in the lib directory) does not help either. Now I get:

cstrom@whitefall:~/repos/my_fab_game$ vows 
module:238
        throw new Error("Cannot find module '" + request + "'");
              ^
Error: Cannot find module 'lib/player_from_querystring'
...

So you cannot require with relative paths in node.js / commonjs. You can muck with the require paths:

var vows = require('vows'),
    assert = require('assert');

require.paths.push("lib");
var player_from_querystring = require('player_from_querystring').app;

var suite = vows.describe('just_playing');

OK, so now I need to see if I can actually test that (fab) app that I required. I am keeping this as simple as possible for now. I add one batch of tests, with one topic and one actual test. I will worry about the terminology another day.

The actual test is from my existing test suite. It acts as a downstream (closer to the browser) fab app. It sends in a player query string and hopes to get a player object back:

var suite = vows.describe('just_playing').addBatch({
    'Body': {
        topic: function() {
          var head = {
            url: { search : "?player=foo&x=1&y=2" },
            headers: { cookie: null }
          };
          var player;
          function downstream (obj) { if (obj) player = obj.body; }

          var upstream_listener = player_from_querystring.call(downstream);
          upstream_listener(head);

          return player;
        },

        'is player': function (player) {
          assert.equal (player.id, "foo");
        }
    }}).export(module);

The test ('is player') asserts that the ID of the player object is "foo", which was set in the query string.

Amazingly, this just works:

cstrom@whitefall:~/repos/my_fab_game$ vows --spec

♢ just_playing

  Body
    ✓ is player
 
✓ OK » 1 honored (0.083s)

I worked out most of the hard stuff when I first tested this app, but still, it is nice to know that I can get it converted so quickly to vows.js. It is even better to know that I can test my fab.js app with vows.js.


Day #152