Failing unit tests for our add and subtract libs

test/unit/test-lib-addition.js

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+var assert = require('assert'),
+add = require('../../lib/add');
+
+exports.it_should_add_two_numbers = function(done){
+  var result = add(1,1);
+  assert.ok(result === 2);
+  return done();
+};
+
+exports.it_should_add_two_negative_numbers = function(done){
+  var result = add(-2,-2);
+  assert.ok(result === -4);
+  return done();
+};

test/unit/test-lib-subtraction.js

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+var assert = require('assert'),
+subtract = require('../../lib/subtract');
+
+exports.it_should_subtract_two_numbers = function(done){
+  var result = subtract(5,4);
+  assert.ok(result === 1);
+  return done();
+};
+
+exports.it_should_subtract_two_negative_numbers = function(done){
+  var result = subtract(-4,-2);
+  assert.ok(result === -2);
+  return done();
+};