justmakesure is an EXTREMELY minimal javascript testing tool.
I was working on a small-ish project and just wanted to make sure a few things were working as intended. I had no internet access to download a library so I wrote this quick and dirty tool.
It is meant to be as easy and as quick as possible to test really basic functionality for small projects.

Add justmakesure.js and justmakesure.css to an html page along with the file you want to test and a test file (or write your tests in your html), open up the html file in your favorite browser and see the results.
Tests that return true will be considered passing. For example:

var a = 3;
            
MAKE_SURE.after_each = function() { a = 3 };
            
// This will pass
makeSure("Multiplying 3 by 4 gives 12", function() {
	a *= 4;
	return a === 12;
});
            
// This will fail
makeSure("Adding 17 to 3 gives 21", function() {
	a += 17;
	return a === 21;
});
            
// This will throw an exception
makeSure("Calling plusOne on 3 gives 4", function() {
	a.plusOne();
	return a === 4;
});
            
// Testing objects
makeSure("An array of numbers is sorted correctly", function() {
	var actual   = [2, 1, 4, 3].sort(),
	expected = [1, 2, 3, 4];
	return JSON.stringify(actual) === JSON.stringify(expected);
});

Please feel free to use and imporove this tool! Email me with ideas or fork and pull.