Created
October 25, 2013 18:35
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Write a javascript function in node.js that requires a callback and handle omitting the callback in a unit test.
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// node module | |
var assert = require('better-assert'); | |
/** | |
* make something | |
* | |
* @param {Function} callback(err, something) | |
*/ | |
var makeSomething = function(callback){ | |
var something = 1; | |
if (arguments.length >= 1){ | |
something++; | |
callback(err, something); | |
} else { | |
// nothing = fail | |
// do not throw error = fail | |
// do not throw custom error message = fail | |
// throw custom error message = pass | |
throw new Error('Missing parameters'); | |
} | |
}; | |
describe('makeSomething()', function(){ | |
it('should be a function', function(){ | |
assert(makeSomething !== undefined, 'must not be undefined'); | |
assert(typeof makeSomething === 'function', 'must be a function'); | |
}); | |
describe('making something to callback to nothing', function(){ | |
it('should throw a meaningful error', function(done){ | |
var err; | |
try { | |
makeSomething(); | |
} catch(e){ | |
err = e; | |
assert(err !== undefined, 'must throw a catchable error'); | |
assert(err.toString() !== 'Error', 'must throw a meaningful error'); | |
} finally { | |
assert(err !== undefined, 'must throw an error'); | |
done(); | |
} | |
}); | |
}); | |
}); |
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