diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..f892ef6
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,89 @@
+# .github/workflows/ci.yml
+
+name: Test
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+env:
+  COVERAGE: true
+  CODECOV_TOKEN: d7028c0e-97c5-485f-85e5-f63daabeef63
+jobs:
+  test-ruby-2-4-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.4
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-5-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.5
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-6-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-7-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-3-0-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.0
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
\ No newline at end of file
diff --git a/lib/rails_stats/code_statistics.rb b/lib/rails_stats/code_statistics.rb
index 5229ffd..bc2ec74 100644
--- a/lib/rails_stats/code_statistics.rb
+++ b/lib/rails_stats/code_statistics.rb
@@ -20,7 +20,8 @@ def initialize(root_directory)
 
     def to_s
       print_header
-      @statistics.each { |key, stats| print_line(key, stats) }
+      sorted_keys = @statistics.keys.sort
+      sorted_keys.each { |key| print_line(key, @statistics[key]) }
       print_splitter
 
       print_line("Code", @code_total)
diff --git a/lib/rails_stats/spec_statistics.rb b/lib/rails_stats/spec_statistics.rb
index b7415cf..f8edda3 100644
--- a/lib/rails_stats/spec_statistics.rb
+++ b/lib/rails_stats/spec_statistics.rb
@@ -37,7 +37,7 @@ def calculate_statistics
       out = {}
       categorize_files.each do |key, list|
         out[key] = Util.calculate_file_statistics(list)
-      end 
+      end
       out
     end
 
diff --git a/lib/rails_stats/test_statistics.rb b/lib/rails_stats/test_statistics.rb
index 2cf0a11..927a998 100644
--- a/lib/rails_stats/test_statistics.rb
+++ b/lib/rails_stats/test_statistics.rb
@@ -35,7 +35,7 @@ def calculate_statistics
       out = {}
       categorize_files.each do |key, list|
         out[key] = Util.calculate_file_statistics(list)
-      end 
+      end
       out
     end
 
diff --git a/lib/rails_stats/util.rb b/lib/rails_stats/util.rb
index 17c4abe..bbe0d39 100644
--- a/lib/rails_stats/util.rb
+++ b/lib/rails_stats/util.rb
@@ -29,7 +29,7 @@ def calculate_shared_projects(shared, *args)
           projects[$1] = true
         end
       end
-      
+
       out = projects.keys
 
       # TODO: make sure none are children of other ones in there
@@ -56,14 +56,14 @@ def calculate_statistics(directories, type = :code, &block)
 
       directories.each do |dir_path|
         next unless File.directory?(dir_path)
-        
+
         key = nil
         if block_given?
           key = yield(dir_path)
         end
 
         key = path_to_name(dir_path, is_test) if !key || key.length == 0
-        
+
         out[key] ||= CodeStatisticsCalculator.new(is_test)
         out[key].add(calculate_directory_statistics(dir_path))
       end
diff --git a/rails_stats.gemspec b/rails_stats.gemspec
index 6e452f3..28fe705 100644
--- a/rails_stats.gemspec
+++ b/rails_stats.gemspec
@@ -21,6 +21,9 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rake"
   spec.add_development_dependency "bundler", ">= 1.6", "< 3.0"
   spec.add_development_dependency "byebug"
+  spec.add_development_dependency "codecov"
   spec.add_development_dependency "minitest"
   spec.add_development_dependency "minitest-around"
+  spec.add_development_dependency "simplecov"
+  spec.add_development_dependency "simplecov-console"
 end
diff --git a/test/lib/rails_stats/code_statistics_test.rb b/test/lib/rails_stats/code_statistics_test.rb
index f4a855a..bfdd6ab 100644
--- a/test/lib/rails_stats/code_statistics_test.rb
+++ b/test/lib/rails_stats/code_statistics_test.rb
@@ -8,14 +8,14 @@
 +----------------------+---------+---------+---------+---------+-----+-------+
 | Name                 | Lines   |     LOC | Classes | Methods | M/C | LOC/M |
 +----------------------+---------+---------+---------+---------+-----+-------+
-| Mailers              |       4 |       4 |       1 |       0 |   0 |     0 |
-| Models               |       3 |       3 |       1 |       0 |   0 |     0 |
-| Javascripts          |      27 |       7 |       0 |       0 |   0 |     0 |
-| Jobs                 |       7 |       2 |       1 |       0 |   0 |     0 |
-| Controllers          |       3 |       3 |       1 |       0 |   0 |     0 |
-| Helpers              |       3 |       3 |       0 |       0 |   0 |     0 |
 | Channels             |       8 |       8 |       2 |       0 |   0 |     0 |
 | Configuration        |     417 |     111 |       1 |       0 |   0 |     0 |
+| Controllers          |       3 |       3 |       1 |       0 |   0 |     0 |
+| Helpers              |       3 |       3 |       0 |       0 |   0 |     0 |
+| Javascripts          |      27 |       7 |       0 |       0 |   0 |     0 |
+| Jobs                 |       7 |       2 |       1 |       0 |   0 |     0 |
+| Mailers              |       4 |       4 |       1 |       0 |   0 |     0 |
+| Models               |       3 |       3 |       1 |       0 |   0 |     0 |
 +----------------------+---------+---------+---------+---------+-----+-------+
 | Code                 |     472 |     141 |       7 |       0 |   0 |     0 |
 | Tests                |       0 |       0 |       0 |       0 |   0 |     0 |
@@ -26,7 +26,8 @@
     EOS
 
     it "outputs useful stats for a Rails project" do
-      root_directory = File.absolute_path("./test/dummy")
+      root_directory = File.expand_path('../../../test/dummy', File.dirname(__FILE__))
+
       assert_output(TABLE) do
         RailsStats::CodeStatistics.new(root_directory).to_s
       end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index aa4e4e5..0e84dab 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,5 +1,23 @@
 # frozen_string_literal: true
 
+if ENV["COVERAGE"] == "true"
+  require "simplecov"
+  require "simplecov-console"
+  require "codecov"
+
+  SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
+    SimpleCov::Formatter::HTMLFormatter,
+    SimpleCov::Formatter::Console,
+    SimpleCov::Formatter::Codecov,
+  ]
+
+  SimpleCov.start do
+    track_files "lib/**/*.rb"
+  end
+
+  puts "Using SimpleCov v#{SimpleCov::VERSION}"
+end
+
 require "byebug"
 
 require "minitest/autorun"