testing javascript file with node

test.js

fs = require("fs");
vm = require("vm");

exports.run = function(options){
    console.log("-- Testing " + (options.file || "on empty context") + " --");
    var script = options.file && load_script(options.file);
    for(test_name in options.tests){
        process.stdout.write(test_name + ": ");
        run_test(script, options.tests[test_name], options.setup, options.teardown);
        console.log("OK");
    }
};

function load_script(path){
    var content = fs.readFileSync(path, "utf8");
    return vm.createScript(content, path);
}

function run_test(script, test, setup, teardown){
    var context = {};
    if(setup){
        setup(context);
    }
    if(script){
        script.runInNewContext(context);
    }
    test(context);
    if(teardown){
        teardown(context);
    }
}

Available options:
file: a path to a js file that should be used as tests context.
tests: an array or object of test functions to execute.
setup: a function to execute before running each test.
teardown: a function to execute after running each test.

Exemple usage testing function ‘hello’ in source file foo.js :

foo.js

function hello(name){
    return "Hello " + name;
}

test_foo.js

#!/usr/bin/env node

assert = require("assert");
test = require("./test");

test.run({
    file: "foo.js", 
    tests: {
        "hello greets correctly": function(context){
            assert.equal("Hello world", context.hello("world"));
        }
    }
});

jstest.tgz