A super simple self-tested testing framework for javascript

microtest.js

// Implementation
// -------------------------------------------------- //

function assert(condition, opt_message) {
    'use strict';
    
    if (!condition) {
        var msg = 'Assertion failed';
        if (opt_message) {
            msg = msg + ': ' + opt_message;
        }
        throw new Error(msg);
    }
}

function describe(obj) {

    "use strict";

    var test = {};

    test.target = obj;

    test.__preaction = test.__postaction = function() { 
        return test; 
    };

    test.before = function(action) {
        test.__preaction = action;
        
        return test;
    };

    test.after = function(action) {
        test.__postaction = action;
        
        return test;
    };
    
    test.do = function(assertions) {
        
        console.log(new Array(80).join("-"));
        
        var passed = 0,
            failed = 0;

        for (var assert in assertions) {

            try {
                assertions[assert].call(obj, test.__preaction());
                passed++;
                console.log("\u2714", assert);
            } catch(x) {
                console.log("\u2716", assert, ":", x.message);
                failed++;
            }

        }
        
        console.log(new Array(80).join("-"));
        console.log("%s passed. %s failed", passed, failed);

        return test;
    };

    return test;

}


// Testing
// -------------------------------------------------- //

describe(String)

    .before(function() {
        return "I'm a sample pre-action return value";
    })

    .after(function() {
        return "I'm a sample post-action return value";
    })

    .do({
        
        "it should be sane": function() {
            assert(true, "this testing library is clearly insane");
        },
        
        "it should be able to use before actions": function(before) {
            assert(before === "I'm a sample pre-action return value", "Before statement failed");
        },

        "it should understand scope": function() {
            assert(this === String, "Scope management failed");
        },

        "it should handle failing tests": function() {
            var exception;

            try {
                assert(this === Boolean);
            } catch(x) {
                exception = x;
            }
            
            assert(exception instanceof Error);
        }

    });