optional coverage

3 files changed, 19 insertions, 5 deletions

diff --git a/HACKING.markdown b/HACKING.markdown
index b158189..be8e396 100644
--- a/HACKING.markdown
+++ b/HACKING.markdown
@@ -8,6 +8,11 @@ Use Bundler to install dependencies before you run the tests:
     bundle
     rake test
 
+To view the test coverage:
+
+    rake coverage
+    open coverage/index.html
+
 ## Running HCl during development
 
 To run HCl in place (e.g. for testing out local changes) you can use bundle exec:
diff --git a/Rakefile b/Rakefile
index f6b7b7b..1e2d162 100644
--- a/Rakefile
+++ b/Rakefile
@@ -13,6 +13,12 @@ Rake::TestTask.new do |t|
 end
 task :default => :test
 
+task :coverage_env { ENV['COVERAGE'] = "YES" }
+Rake::TestTask.new(:coverage => :coverage_env) do |t|
+  t.libs << 'test'
+  t.test_files = FileList['test/*_test.rb']
+end
+
 require 'yard'
 YARD::Rake::YardocTask.new
 task :doc => :yard
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 0b8708d..d155982 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,9 +1,12 @@
 require 'bundler'
-require 'simplecov'
-SimpleCov.start do
-  add_filter '/test/'
-  add_filter do |source_file|
-    source_file.lines.count < 15
+
+if ENV['COVERAGE'] == 'YES'
+  require 'simplecov'
+  SimpleCov.start do
+    add_filter '/test/'
+    add_filter do |source_file|
+      source_file.lines.count < 15
+    end
   end
 end