diff --git a/Gemfile b/Gemfile
index b1a1c2a..d4efc86 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,12 @@ source "http://rubygems.org"
 
 # Specify your gem's dependencies in guard-rocco.gemspec
 gemspec
+
+require 'rbconfig'
+gem 'guard'
+gem 'guard-rspec'
+
+if RbConfig::CONFIG['host_os'] =~ /darwin/
+  gem 'growl'
+  gem 'rb-fsevent'
+end
diff --git a/Guardfile b/Guardfile
new file mode 100644
index 0000000..783f1ae
--- /dev/null
+++ b/Guardfile
@@ -0,0 +1,8 @@
+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+guard 'rspec', :version => 2 do
+  watch(%r{^spec/.+_spec\.rb$})
+  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb')  { "spec" }
+end
diff --git a/guard-rocco.gemspec b/guard-rocco.gemspec
index 10fee82..ec78a2d 100644
--- a/guard-rocco.gemspec
+++ b/guard-rocco.gemspec
@@ -21,5 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'guard', '>= 0.4.0'
   s.add_dependency 'rocco'
+  s.add_development_dependency 'rspec', '~> 2.6.0'
+  s.add_development_dependency 'mocha'
 end
 
diff --git a/lib/guard/rocco.rb b/lib/guard/rocco.rb
index 5afc405..35e8181 100644
--- a/lib/guard/rocco.rb
+++ b/lib/guard/rocco.rb
@@ -1,5 +1,6 @@
 require 'rocco'
 require 'guard/guard'
+require 'fileutils'
 
 module Guard
   class Rocco < Guard
@@ -23,8 +24,9 @@ module Guard
 
     private
     def build(path, target = nil)
-      target ||= self.filename_to_target(path)
+      target ||= filename_to_target(path)
       puts "rocco: #{path} -> #{target}"
+      FileUtils.mkdir_p File.split(target).first
       File.open(target, 'wb') { |fh| fh.print ::Rocco.new(path, all_paths).to_html }
     end
 
@@ -32,7 +34,7 @@ module Guard
       Watcher.match_files(self, Dir['**/*'])
     end
 
-    def self.filename_to_target(path)
+    def filename_to_target(path)
       File.join(@options[:dir], path).gsub(%r{\.[^\.]+$}, '.html')
     end
   end
diff --git a/spec/lib/guard/rocco_spec.rb b/spec/lib/guard/rocco_spec.rb
new file mode 100644
index 0000000..cab5520
--- /dev/null
+++ b/spec/lib/guard/rocco_spec.rb
@@ -0,0 +1,40 @@
+require 'spec_helper'
+require 'guard/rocco'
+require 'fileutils'
+
+describe Guard::Rocco do
+  let(:doc_dir) { 'spec/doc' }
+
+  before do
+    FileUtils.rm_rf doc_dir
+    FileUtils.mkdir_p doc_dir
+  end
+
+  after do
+    FileUtils.rm_rf doc_dir
+  end
+
+  let(:guard) { Guard::Rocco.new([], :dir => doc_dir) }
+  let(:filename) { 'lib/guard/rocco.rb' }
+
+  describe '#run_all' do
+    before do
+      guard.stubs(:all_paths).returns([filename])
+    end
+
+    it 'should generate the docs' do
+      guard.run_all
+
+      File.file?(File.join(doc_dir, 'lib/guard/rocco.html')).should be_true
+    end
+  end
+
+  describe '#run_on_change' do
+    it 'should generate the doc' do
+      guard.run_on_change([filename])
+
+      File.file?(File.join(doc_dir, 'lib/guard/rocco.html')).should be_true
+    end
+  end
+end
+
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..d472384
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,4 @@
+RSpec.configure do |c|
+  c.mock_with :mocha
+end
+