harness-js

Yet another test organizer except that is works in NodeJS, Mongo's shell and a modern web browsers. Being able to run across these three environments without depending on libraries like RequireJS was a major reason I wrote this module. Hopefully it is helpful to others.

Overview

Harness provides a simple way of organizing assertive tests in Mongo's shell (using mongo-modules), NodeJS and in many web browsers.

NodeJS example

	var path = require("path"),
		assert = require("assert"),
		harness = require("harness");
	
	// Setup a test by assigning a function to callback and
	// a label to the test group.
	harness.push({callback: function (test_label) {
		assert.strictEqual(harness.counts("running"), 1, "Should have on test running for 'Testing push()'");
	
		// Now that you've completed this test
		// group tell harness that this label
		// is now complete.
		harness.completed(test_label);
	}, label: "Test group 1"});
	
	// This is a second test group just to show you can do
	// more than one group of tests.
	// Setup a test by assigning a function to callback and
	// a label to the test group.
	harness.push({callback: function (test_label) {
		assert.strictEqual(harness.counts("running"), 2, "Should have on test running for 'Testing push()'");
	
		// Now that you've completed this test
		// group tell harness that this label
		// is now complete.
		harness.completed(test_label);
	}, label: "Test group 2"});
	
	harness.RunIt(path.basename(module.filename), 10);

The command to run example/node-example.js looks like-

	node example/node-example.js

The output would look something like-

	Starting [node-example.js] ...
		Starting Test group 1 ...
			Test group 1 called
			Test group 1 OK
		Starting Test group 2 ...
			Test group 2 called
			Test group 2 OK
	node-example.js Success!

Mongo example

Harness support comes with mongo-modules and mongo-modules will need to be installed for it to work. Other than that it looks much like the NodeJS version above. The difference is that the module.filename object isn't defined by mongo-modules so we must define that ourselves.

	var path = require("path"),
		assert = require("assert"),
		harness = require("harness"),
		// mongo-modules does not define the module object's
		// filename.
		module = {
			filename: "mongo-example.js"
		};
	
	// Setup a test by assigning a function to callback and
	// a label to the test group.
	harness.push({callback: function (test_label) {
		assert.strictEqual(harness.counts("running"), 1,
			"Should have on test running for 'Testing push()'");

		// Now that you've completed this test
		// group tell harness that this label
		// is now complete.
		harness.completed(test_label);
	}, label: "Test group 1"});
	
	// This is a second test group just to show you can do
	// more than one group of tests.
	// Setup a test by assigning a function to callback and
	// a label to the test group.
	harness.push({callback: function (test_label) {
		assert.strictEqual(harness.counts("running"), 2, "Should have on test running for 'Testing push()'");
	
		// Now that you've completed this test
		// group tell harness that this label
		// is now complete.
		harness.completed(test_label);
	}, label: "Test group 2"});
	
	harness.RunIt(path.basename(module.filename), 10);

Running the example/mongo-example.js with mongo-modules available is done like-

	mongo ~/.mongojs.rc example/mongo-example.js

The output should look something like-

	MongoDB shell version: 2.2.0
	connecting to: test
	loading file: /Users/johndoe/.mongorc.js
	loading file: example/mongo-example.js
	Starting [mongo-example.js] ...
		Starting Test group 1 ...
			Test group 1 called
			Test group 1 OK
		Starting Test group 2 ...
			Test group 2 called
			Test group 2 OK
	mongo-example.js Success!

Including targets for tests

Now that we can run tests on multiple platforms we still have occasion to only need to run tests for specific targets. You can test a list of targets when you call harness' push method. The list of supported targets are "node", "mongo" and "browser". Here's an example of group tests for each of these targets-

	var path = require("path"),
		assert = require("assert"),
		harness = require("../harness");
	
	// This are tests targeted at the browser only
	harness.push({callback: function (test_label) {
		assert.ok(true, "Browser only");
		harness.completed(test_label);
	}, label: "BrowserOnly", targets: ["browser"]});
	
	harness.push({callback: function (test_label) {
		assert.ok(true, "Node only");
		harness.completed(test_label);
	}, label: "NodeOnly", targets: ["node"]});
	
	harness.push({callback: function (test_label) {
		assert.ok(true, "Mongo only");
		harness.completed(test_label);
	}, label: "MongoOnly", targets: ["mongo"]});
	
	harness.push({callback: function (test_label) {
		assert.ok(true, "Mongo only");
		harness.completed(test_label);
	}, label: "Combination", targets: ["node", "mongo", "browser"]});
	
	harness.RunIt("Target Demo", 10);