diff --git a/Gemfile b/Gemfile
index 98c4a37..aebb6ed 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,4 +7,4 @@ gem 'guard'
 gem 'guard-rspec'
 gem 'mocha'
 gem 'fakefs'
-
+gem 'rspec', '~> 2.6.0'
diff --git a/lib/penchant.rb b/lib/penchant.rb
index aa2748b..0dfcd5d 100644
--- a/lib/penchant.rb
+++ b/lib/penchant.rb
@@ -1,3 +1,3 @@
 module Penchant
-  # Your code goes here...
+  autoload :Gemfile, 'penchant/gemfile'
 end
diff --git a/lib/penchant/gemfile.rb b/lib/penchant/gemfile.rb
index e69de29..e7ba2e9 100644
--- a/lib/penchant/gemfile.rb
+++ b/lib/penchant/gemfile.rb
@@ -0,0 +1,23 @@
+module Penchant
+  class Gemfile
+    attr_reader :path
+
+    def initialize(path)
+      @path = path
+    end
+
+    def has_gemfile?
+      has_file_in_path?('Gemfile')
+    end
+
+    def has_gemfile_erb?
+      has_file_in_path?('Gemfile.erb')
+    end
+
+    private
+    def has_file_in_path?(file)
+      File.file?(File.join(@path, file))
+    end
+  end
+end
+
diff --git a/spec/lib/penchant/gemfile_spec.rb b/spec/lib/penchant/gemfile_spec.rb
index cfb9521..67bff59 100644
--- a/spec/lib/penchant/gemfile_spec.rb
+++ b/spec/lib/penchant/gemfile_spec.rb
@@ -1,6 +1,44 @@
 require 'spec_helper'
 
 describe Penchant::Gemfile do
+  include FakeFS::SpecHelpers
 
+  let(:dir) { File.expand_path(Dir.pwd) }
+  let(:gemfile) { described_class.new(dir) }
+
+  let(:gemfile_path) { File.join(dir, 'Gemfile') }
+  let(:gemfile_erb_path) { File.join(dir, 'Gemfile.erb') }
+
+  def write_file(path, content = nil)
+    File.open(path, 'wb') do |fh|
+      content = yield if block_given?
+      fh.print content
+    end
+  end
+
+  subject { gemfile }
+
+  context 'with no gemfile' do
+    it { should_not have_gemfile }
+    it { should_not have_gemfile_erb }
+  end
+
+  context 'with gemfile' do
+    before do
+      write_file(gemfile_path) { "whatever" }
+    end
+
+    it { should have_gemfile }
+    it { should_not have_gemfile_erb }
+  end
+
+  context 'with gemfile.erb' do
+    before do
+      write_file(gemfile_erb_path) { "whatever" }
+    end
+
+    it { should_not have_gemfile }
+    it { should have_gemfile_erb }
+  end
 end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e69de29..c9de50a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -0,0 +1,6 @@
+require 'fakefs/spec_helpers'
+require 'penchant'
+
+RSpec.configure do |c|
+  c.mock_with :mocha
+end