A drop-in replacement library that allows you to use asserts inside an async function utilising callbacks to handle errors.
[X]...assert(value, [message])[X]...assert.ok(value, [message])[X]...assert.equal(actual, expected, [message])[X]...assert.notEqual(actual, expected, [message])[X]...assert.deepEqual(actual, expected, [message])[X]...assert.notDeepEqual(actual, expected, [message])[X]...assert.strictEqual(actual, expected, [message])[X]...assert.notStrictEqual(actual, expected, [message])[ ]...assert.throws(block, [error], [message])[ ]...assert.doesNotThrow(block, [message])
npm install assert-callback
Like the normal assert(), if the test condition (1st argument) fails, instead of throwing an exception, if you gave it a callback it will call the callback and pass the exception into it as the first argument, as per node.js' convention.
var assert = require('assert-callback');
var test = function (data, done) {
assert(typeof data === 'object', 'Expecting data to be an object', done);
};
test(null, function (err) {
console.log(err.message); // Expecting data to be an object
});
If the condition passes, it acts like a normal assert:
var assert = require('assert-callback');
assert(true, 'Expecting no problems');
console.log('Yeah'); // Code execution reaches here, no problem!
Here's an example of how you can use it in a real project, say, inside your MVC's model:
// Assuming params is an object containing data to be saved into the DB
saveToDatabase(params, callback) {
assert(params.id, callback);
assert(params.name, callback);
assert.equal(params.verified, true, 'Data must be verified before saving', callback);
// The rest of your code
callback(null, 'Save completed!');
}
Note: assert.throws, assert.doesNotThrow, assert.isEqual and assert.fail functions the same as node's assert, callback or not.
Copyright (c) 2014 Ruben L Z Tan (soggie)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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