Verify

A [very] lightweight JS testing framework for node

Background

As I am new to the world of TDD, I found I fatigued rather quickly of the enormous and complex libraries required just to test my code. So I decided to develop my own that is much more compact, though perhaps lacking some of the less common features available in typical testing frameworks.

Usage

Simply require and execute verify.js at the top of your testing script using require('verify.js')(). Each time you write a test, you will call verify() with the optional first argument being the test description to be printed with the result, and the second argument being an anonymous function. The function chained to verify() will evaluate the anonymous function's return, output, and error and compare it to what is expected. These are the available functions for evaluation:

• returns(): verify that the return value of the function is equal to the given value

   verify(function() { return true; }).returns(true); // PASS
   verify(function() { return false; }).returns(true); // FAIL

• returnsInstanceOf(): verify that the return value of the function is an instance of the given class/object

   verify(function() { return /foo/; }).returnsInstanceOf(RegExp); // PASS
   verify(function() { return /foo/; }).returnsInstanceOf(Date); // FAIL

• prints(): verify that the printed output of the function (sans trailing newline) is equal to the given value

   verify(function() { console.log("foo"); }).prints("foo"); // PASS
   verify(function() { console.log("foo"); }).prints("bar"); // FAIL

• throwsError(): verify that the function throws an error; if an argument is given, verify that it is equal to the error thrown

   verify(function() { new RegExp('[a-z+'); }).throwsError(); // PASS
   verify(function() { new RegExp('[a-z]+'); }).throwsError(); // FAIL

A standalone tally() function is also provided, which prints the cumulative score of the tests.