Report test coverage with coveralls

.simplecov

@@ -0,0 +1,4 @@
+SimpleCov.start do
+  add_filter 'spec/'
+  add_filter 'test/'
+end

Rakefile

@@ -1,7 +1,10 @@
+require 'coveralls/rake/task'
 require 'rake/testtask'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
 
+Coveralls::RakeTask.new
+
 Rake::TestTask.new do |t|
   t.name = 'minitest'
   t.pattern = "test/**/*_test.rb"
@@ -15,7 +18,7 @@ RuboCop::RakeTask.new do |t|
   t.options = ['--force-exclusion']
 end
 
-task :test => [:minitest, :spec]
+task :test => [:minitest, :spec, 'coveralls:push']
 task :default => [:test, :rubocop]
 
 task :console do

spec/spec_helper.rb

@@ -1,3 +1,6 @@
+require 'coveralls'
+
+Coveralls.wear_merged!
 
 # just in case
 if RUBY_VERSION.to_i < 2

test/layout_test.rb

@@ -39,6 +39,7 @@
                       .gitignore
                       .rspec
                       .rubocop.yml
+                      .simplecov
                       .travis.yml
                       CONDUCT.md
                       CONTRIBUTING.md

test/test_helper.rb

@@ -1,5 +1,8 @@
 require 'bundler'
 require 'bundler/setup'
+require 'coveralls'
+
+Coveralls.wear_merged!
 
 # just in case
 if RUBY_VERSION.to_i < 2