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Thursday, July 1st, 2010

Keep your vows; Keeping wed to Node

Category: Node, Testing

<p>Vows can be a beautiful thing. Alexis Sellier of LESS fame, is becoming an open source star. This time around he brings us Vows an asynchronous-friendly behavior driven development framework for Node.js.

Write you BBD specs like this:

PLAIN TEXT
JAVASCRIPT:
  1.  
  2. // division-by-zero-test.js
  3.  
  4. var vows = require('vows'),
  5.     assert = require('assert');
  6.  
  7. // Create a Test Suite
  8. vows.describe('Division by Zero').addBatch({
  9.     'when dividing a number by zero': {
  10.         topic: function () { return 42 / 0 },
  11.  
  12.         'we get Infinity': function (topic) {
  13.             assert.equal (topic, Infinity);
  14.         }
  15.     },
  16.     'but when dividing zero by zero': {
  17.         topic: function () { return 0 / 0 },
  18.  
  19.         'we get a value which': {
  20.             'is not a number': function (topic) {
  21.                 assert.isNaN (topic);
  22.             },
  23.             'is not equal to itself': function (topic) {
  24.                 assert.notEqual (topic, topic);
  25.             }
  26.         }
  27.     }
  28. }).run(); // Run it
  29.  

and you get a very nice report card out of the other end:

With macros you end up with very nice DSL syntax such as:

PLAIN TEXT
JAVASCRIPT:
  1.  
  2. {   'GET /': {
  3.         topic: api.get('/'),
  4.         'shoud respond with a 200 OK': assertStatus(200)
  5.     },
  6.     'POST /': {
  7.         topic: api.post('/'),
  8.         'shoud respond with a 405 Method not allowed': assertStatus(405)
  9.     },
  10.     'GET /resources (no api-key)': {
  11.         topic: api.get('/resources'),
  12.         'shoud respond with a 403 Forbidden': assertStatus(403)
  13.     },
  14.     'GET /resources?apikey=af816e859c249fe'
  15.         topic: api.get('/resources?apikey=af816e859c249fe'),
  16.         'shoud return a 200 OK': assertStatus(200),
  17.         'should return a list of resources': function (res) {
  18.             assert.isArray (res.body);
  19.         }
  20.     }
  21. }
  22.  
  23. // or even
  24. {
  25.   'GET  /':                   respondsWith(200),
  26.   'POST /':                   respondsWith(405),
  27.   'GET  /resources (no key)': respondsWith(403)
  28. }
  29.  

The website itself goes into exquisite detail on the install process, sample usage, and more. The website also happens to be beautiful itself, and full of HTML5 markup to boot.

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1 Comment »

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Sexy site and sexy-looking tool :) Javascript is an awesome language.

Comment by Skilldrick — July 6, 2010

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