Helpers functions for promises based unit testing

gistfile1.js

// testq.js
// Test Q based functions
//

var Q = require('q');

var asQ = function(f) {
	return function(test) {
		f(test).fin(function() {
			test.done();
		}).done();
	};
};

var rejects = function(f) {
	return asQ(function(test) {
		return f(test).then(function() {
			test.ok(false, "Should reject");
		}).catch(function() {
			test.ok(true, "Should reject");
		});
	});
};

var accepts = function(f) {
	return asQ(function(test) {
		return f(test).then(function() {
			test.ok(true, "Should accept");
		}).catch(function() {
			test.ok(false, "Should accept");
		});
	});
};

var doLater = function(throwError) {
	var d = Q.defer();
	setTimeout(function() {
		if (throwError)
			return d.reject(new Error('You messed up'));
		d.resolve({ result: 'I got you' });
	}, 300 + Math.floor(Math.random() * 700));

	return d.promise;
}

exports.tests = {
	testManual: asQ(function(test) {
		return doLater().then(function(res) {
			test.ok(res.value !== undefined, 'Value should not be undefined');
		});
	}),

	testCheckRejects: rejects(function(test) {
		return doLater(true);
	}),

	testCheckAccepts: accepts(function(test) {
		return doLater();
	}),

	testCheckAcceptsButFails: accepts(function(test) {
		return doLater(true);
	})
}