Rakefile in dockerfile-rails-0.4.5 vs Rakefile in dockerfile-rails-0.4.6

@@ -1,3 +1,17 @@
 require "bundler/gem_tasks"
 
 # Run `rake release` to release a new version of the gem.
+
+require 'rake/testtask'
+Rake::TestTask.new do |t|
+  t.libs << "test"
+  t.test_files = FileList['test/test*.rb']
+  t.verbose = true
+end
+
+namespace :test do
+  task :capture do
+    ENV['TEST_CAPTURE'] = 'true'
+    Rake::Task[:test].invoke
+  end
+end