A Sample Snippet showing Unit Testing of JS Libraries using CasperJS

test.js

/*
Method 1: By loading the library through a web page.
The usability is pretty limited due to what can be returned through evaluate() is limited.
*/

casper.test.begin("Setting up test", 3, function suite(test){
    casper.start("http://localhost/livetransit/test/", function(){
        // Asserting pages would help
        test.assertTitle("Test page", "page exists as expected");
    });

    casper.then(function(){
        test.assertEvalEquals(function(){ return LiveTransit.getName(); }, "Live Transit", "Library Live Transit is loaded");
        test.assertEvalEquals(function(){ return LiveTransit.name; }, "Live Transit", "Library name checked");
        test.done();
    });

    casper.run(function(){
        test.done();
    });
});


/*
Method 2: Loading the JS file directly like a module using the require() function.
Here the tests are straight forward just as it is supposed to be for direct Unit Testing
*/

casper.test.begin('Loading LT library', 2, function(test){
    var lt;
    lt = require('../../src/livetransit.js');
    test.assertEquals(lt.getName(), 'Live Transit');
    test.assertEquals(lt.name, 'Live Transit');
    test.done();
});