Implement fsUtils.isDirectory() helper

lib/fs-utils/fs-utils.coffee

@@ -1,5 +1,11 @@
+fs = require('fs')
 _ = require('lodash')
 
 # TODO: There should be more complex checks here
 exports.isValidPath = (p) ->
 	return _.isString(p)
+
+exports.isDirectory = (directory, callback) ->
+	fs.stat directory, (error, stats) ->
+		return callback?(error) if error?
+		return callback?(null, stats.isDirectory())

lib/fs-utils/fs-utils.spec.coffee

@@ -1,6 +1,15 @@
 expect = require('chai').expect
+mockFs = require('mock-fs')
 fsUtils = require('./fs-utils')
 
+FILESYSTEM =
+	text:
+		name: '/tmp/text'
+		contents: 'Hello World'
+	directory:
+		name: '/tmp/directory'
+		contents: mockFs.directory()
+
 describe 'FsUtils:', ->
 
 	describe '#isValidPath()', ->
@@ -25,3 +34,32 @@ describe 'FsUtils:', ->
 				'./file/../file2'
 			]
 				expect(fsUtils.isValidPath(validPath)).to.be.true
+
+	describe '#isDirectory()', ->
+
+		beforeEach ->
+			mockFsOptions = {}
+			for key, value of FILESYSTEM
+				mockFsOptions[value.name] = value.contents
+			mockFs(mockFsOptions)
+
+		afterEach ->
+			mockFs.restore()
+
+		it 'should return true if directory', (done) ->
+			fsUtils.isDirectory FILESYSTEM.directory.name, (error, isDirectory) ->
+				expect(error).to.not.exist
+				expect(isDirectory).to.be.true
+				done()
+
+		it 'should return false if not a directory', (done) ->
+			fsUtils.isDirectory FILESYSTEM.text.name, (error, isDirectory) ->
+				expect(error).to.not.exist
+				expect(isDirectory).to.be.false
+				done()
+
+		it 'should return an error if the path doesn\'t exists', (done) ->
+			fsUtils.isDirectory '/nonexistantpath', (error, isDirectory) ->
+				expect(error).to.exist
+				expect(isDirectory).to.be.undefined
+				done()