Added isFibonacci to coding challenges

Author: ratracegrad

isFibonacci/isFibonacci.js

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+/***************************************************************
+ *                                                             *
+ *                       CodePrep.io                           *
+ *                                                             *
+ *   Function:  isFibonacci(num)                               *
+ *   Input:    1 number parameter                              *
+ *   Output:   Boolean                                         *
+ *                                                             *
+ *   Output expectations:                                      *
+ *   var myTest = isFibonacci(10);                             *
+ *   console.log(myTest); // false                             *
+ *   var myTest = isFibonacci(13); // true                     *
+ *                                                             *
+ *   The Fibonacci sequence starts with 0 and 1 and the        *
+ *   next number in the sequence is the sum of the previous    *
+ *   two numbers.                                              *
+ *                                                             *
+ *   Write the code for the isFibonacci function that          *
+ *   accepts a number input and returns true or false if       *
+ *   that number is in the Fibonacci sequence.                 *
+ *                                                             *
+ **************************************************************/
+
+var isFibonacci = function(num) {
+    /* YOUR CODE GOES HERE */
+
+}

isFibonacci/isFibonacci.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('isFibonacci', function() {
+    it('should exist', function(){
+        should.exist(isFibonacci);
+    });
+
+    it('should be a function', function() {
+        isFibonacci.should.be.a.Function;
+    });
+
+    it('should return a Boolean', function() {
+        var result = isFibonacci(5);
+        should.exist(result);
+        result.should.be.an.instanceof(Boolean);
+    });
+
+    it('should return false if no input provided', function() {
+        var result = isFibonacci();
+        result.should.be.eql(false);
+    });
+
+    it('should return true if input is 1', function(){
+        var result = isFibonacci(1);
+        result.should.be.eql(true);
+    });
+
+    it('should have the right answer', function(){
+        var result = isFibonacci(5);
+        result.should.be.eql(true);
+    });
+
+    it('should have the right answer', function(){
+        var result = isFibonacci(6);
+        result.should.be.eql(false);
+    });
+
+    it('should handle large numbers', function() {
+        var result = isFibonacci(233);
+        result.should.be.eql(true);
+    });
+
+});

isFibonacci/package.json

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+{
+  "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"
+  }
+}