Make it a gem.

.gitignore

@@ -11,6 +11,7 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+coverage
 
 # YARD artifacts
 .yardoc

Gemfile

@@ -0,0 +1,14 @@
+source "http://rubygems.org"
+# Add dependencies required to use your gem here.
+# Example:
+#   gem "activesupport", ">= 2.3.5"
+
+# Add dependencies to develop your gem here.
+# Include everything needed to run rake, tests, features, etc.
+group :development do
+  gem "shoulda", ">= 0"
+  gem "rdoc", "~> 3.12"
+  gem "bundler", ">= 1.0.0"
+  gem "jeweler", "~> 1.8.3"
+  gem 'simplecov'
+end

Gemfile.lock

@@ -0,0 +1,33 @@
+GEM
+  remote: http://rubygems.org/
+  specs:
+    git (1.2.5)
+    jeweler (1.8.3)
+      bundler (~> 1.0)
+      git (>= 1.2.5)
+      rake
+      rdoc
+    json (1.7.3)
+    multi_json (1.3.6)
+    rake (0.9.2.2)
+    rdoc (3.12)
+      json (~> 1.4)
+    shoulda (3.0.1)
+      shoulda-context (~> 1.0.0)
+      shoulda-matchers (~> 1.0.0)
+    shoulda-context (1.0.0)
+    shoulda-matchers (1.0.0)
+    simplecov (0.6.4)
+      multi_json (~> 1.0)
+      simplecov-html (~> 0.5.3)
+    simplecov-html (0.5.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler (>= 1.0.0)
+  jeweler (~> 1.8.3)
+  rdoc (~> 3.12)
+  shoulda
+  simplecov

Rakefile

@@ -31,14 +31,6 @@ Rake::TestTask.new(:test) do |test|
   test.verbose = true
 end
 
-require 'rcov/rcovtask'
-Rcov::RcovTask.new do |test|
-  test.libs << 'test'
-  test.pattern = 'test/**/test_*.rb'
-  test.verbose = true
-  test.rcov_opts << '--exclude "gems/*"'
-end
-
 task :default => :test
 
 require 'rdoc/task'

test/helper.rb

@@ -1,3 +1,6 @@
+require 'simplecov'
+SimpleCov.start
+
 require 'rubygems'
 require 'bundler'
 begin