using mocha testing with cloud9, execute mocha tests from node.js - unit-testing

Question

I was wondering if there is a way to execute mocha tests programmatically from node.js so that I can integrate unit tests with Cloud 9. The cloud 9 IDE has a nice feature where whenever a javascript files is saved, it looks for a file with the same name, ending with either "_test" or "Test" and runs it automatically using node.js. For example it has this code snippet in a file demo_test.js which automatically runs.
if (typeof module !== "undefined" && module === require.main) {
require("asyncjs").test.testcase(module.exports).exec()
}
Is there something like this I could use to run a mocha test? Something like a mocha(this).run()?

Answer 1

The essentials to programmatically run mocha:
Require mocha:
var Mocha = require('./'); //The root mocha path (wherever you git cloned
//or if you used npm in node_modules/mocha)
Instatiate call the constructor:
var mocha = new Mocha();
Add test files:
mocha.addFile('test/exampleTest'); // direct mocha to exampleTest.js
Run it!:
mocha.run();
Add chained functions to programmatically deal with passed and failed tests. In this case add a call back to print the results:
var Mocha = require('./'); //The root mocha path
var mocha = new Mocha();
var passed = [];
var failed = [];
mocha.addFile('test/exampleTest'); // direct mocha to exampleTest.js
mocha.run(function(){
console.log(passed.length + ' Tests Passed');
passed.forEach(function(testName){
console.log('Passed:', testName);
});
console.log("\n"+failed.length + ' Tests Failed');
failed.forEach(function(testName){
console.log('Failed:', testName);
});
}).on('fail', function(test){
failed.push(test.title);
}).on('pass', function(test){
passed.push(test.title);
});

Answer 2

Your mileage may vary, but I concocted the following one-liner a while back and it has served me pretty well:
if (!module.parent)(new(require("mocha"))()).ui("exports").reporter("spec").addFile(__filename).run(process.exit);
Additionally, if you want it to be output in asyncjs format that Cloud9 is expecting, you'll need to provide a special reporter. Here's a really simple example of what a simple reporter would look like:
if (!module.parent){
(new(require("mocha"))()).ui("exports").reporter(function(r){
var i = 1, n = r.grepTotal(r.suite);
r.on("fail", function(t){ console.log("\x1b[31m[%d/%d] %s FAIL\x1b[0m", i++, n, t.fullTitle()); });
r.on("pass", function(t){ console.log("\x1b[32m[%d/%d] %s OK\x1b[0m", i++, n, t.fullTitle()); });
r.on("pending", function(t){ console.log("\x1b[33m[%d/%d] %s SKIP\x1b[0m", i++, n, t.fullTitle()); });
}).addFile(__filename).run(process.exit);
}