added cli prime checker

bin/prime

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+
+'use strict';
+
+var program = require('commander')
+  , version = require('../package.json').version;
+
+var isPrime = require('../lib/prime');
+
+program
+  .version(version)
+  .parse(process.argv);
+
+if (!program.args || !program.args.length) {
+  console.error('No number provided');
+  process.exit(1);
+}
+
+var number = Number(program.args[0]);
+
+if (isNaN(number)) {
+  console.error('Expected number, got ' + program.args[0]);
+  process.exit(1);
+}
+
+if (isPrime(number)) {
+  console.log(number + ' is prime');
+} else {
+  console.log(number + ' is not prime');
+}

package.json

@@ -1,15 +1,14 @@
 {
   "name": "interview",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "A collection of command line tools for snarky answers to generic interview questions",
   "main": "bin/fizzbuzz",
   "bin": {
-    "itv-fizz": "bin/fizzbuzz",
+    "itv-anagrams": "bin/anagrams",
+    "itv-fib": "bin/fib",
     "itv-fizzbuzz": "bin/fizzbuzz",
-    "itv-strrev": "bin/strrev",
     "itv-prime": "bin/prime",
-    "itv-fib": "bin/fib",
-    "itv-anagrams": "bin/anagrams"
+    "itv-strrev": "bin/strrev"
   },
   "preferGlobal": true,
   "scripts": {

test/prime.js

@@ -0,0 +1,51 @@
+'use strict';
+
+require('should');
+
+var exec = require('child_process').exec;
+
+describe('Prime', function() {
+  it('should correctly identify a prime number', function(done) {
+    exec('./bin/prime 13', 
+      function (err, stdout, stderr) {
+        if (err) { return done(err); }
+
+        stdout.should.eql('13 is prime\n');
+        stderr.should.eql('');
+        done();
+    });
+  });
+
+  it('should correctly identify a non-prime number', function(done) {
+    exec('./bin/prime 12', 
+      function (err, stdout, stderr) {
+        if (err) { return done(err); }
+
+        stdout.should.eql('12 is not prime\n');
+        stderr.should.eql('');
+        done();
+    });
+  });
+
+  it('should log an error when called with no arguments', function(done) {
+    exec('./bin/prime', 
+      function (err, stdout, stderr) {
+        stderr.should.eql('No number provided\n');
+        err.code.should.eql(1);
+        stdout.should.eql('');
+
+        done();
+    });
+  });
+
+  it('should log an error when called with incorrect arguments', function(done) {
+    exec('./bin/prime eleventybillion', 
+      function (err, stdout, stderr) {
+        stderr.should.eql('Expected number, got eleventybillion\n');
+        err.code.should.eql(1);
+        stdout.should.eql('');
+
+        done();
+    });
+  });
+});