Added sumNumbers to coding challenges.

Author: ratracegrad

sumNumbers/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "CodePrep.io_coding_challenges",
+  "author": "Jennifer Bland",
+  "url": "http://www.codeprep.io",
+  "version": "1.0.0",
+  "description": "CodePrep.io presents coding challenges you might face when interviewing for a Full-Stack Developer position",
+  "scripts": {
+    "test": "node ../node_modules/mocha/bin/mocha ./*.test.js"
+  }
+}

sumNumbers/sumNumbers.js

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+/***************************************************************
+ *                                                             *
+ *                       CodePrep.io                           *
+ *                                                             *
+ *   Function:  sumNumbers(num)                                *
+ *   Input:    1 number parameter                              *
+ *   Output:   number                                          *
+ *                                                             *
+ *   Output expectations:                                      *
+ *   var myTest = sumNumbers(10);                              *
+ *   console.log(myTest); // 55                                *
+ *                                                             *
+ *   Write the code for the sumNumbers function that           *
+ *   accepts a number input and then sums the total for        *
+ *   all numbers from 1 to num.  Output the total              *
+ *                                                             *
+ **************************************************************/
+
+var sumNumbers = function(num) {
+    /* YOUR CODE GOES HERE */
+
+};

sumNumbers/sumNumbers.test.js

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+var should = require('should');
+var vm = require('vm');
+var fs = require('fs');
+var filename = __filename.replace(/\.test\.js$/, '.js');
+vm.runInThisContext(fs.readFileSync(filename), filename);
+
+
+describe('sumNumbers', function() {
+    it('should exist', function(){
+        should.exist(sumNumbers);
+    });
+
+    it('should be a function', function() {
+        sumNumbers.should.be.a.Function;
+    });
+
+    it('should return a Number', function() {
+        var result = sumNumbers(5);
+        should.exist(result);
+        result.should.be.an.instanceof(Number);
+    });
+
+    it('should return zero if no input provided', function() {
+        var result = sumNumbers();
+        result.should.be.eql(0);
+    });
+
+    it('should return one if input is 1', function(){
+        var result = sumNumbers(1);
+        result.should.be.eql(1);
+    });
+
+    it('should have the right answer', function(){
+        var result = sumNumbers(5);
+        result.should.be.eql(15);
+    });
+
+    it('should handle large numbers', function() {
+        var result = sumNumbers(15);
+        result.should.be.eql(120);
+    });
+
+});