diff --git a/.gitignore b/.gitignore
index 1e43942..eecf914 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,9 @@ yarn-debug.log*
 .yarn-integrity
 
 /config/deploy/config.yml
+
+# SimpleCov coverage output
+/coverage
+
+# OS file
+.DS_Store
diff --git a/.travis.yml b/.travis.yml
index 025f452..2a521e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,5 +23,5 @@ install:
 
 script:
   - bundle exec rubocop
-  - bundle exec rails test
-  - bundle exec rails test:system
+  - bundle exec rails test NO_COVERAGE=1
+  - bundle exec rails test:system NO_COVERAGE=1
diff --git a/Gemfile b/Gemfile
index d9768ad..9f96957 100644
--- a/Gemfile
+++ b/Gemfile
@@ -81,6 +81,7 @@ group :test do
   gem 'launchy'
 
   gem "database_cleaner"
+  gem "simplecov", require: false
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/Gemfile.lock b/Gemfile.lock
index ee624a2..3326b9c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,6 +104,7 @@ GEM
       warden (~> 1.2.3)
     devise-i18n (1.6.2)
       devise (>= 4.4)
+    docile (1.3.1)
     erubi (1.7.1)
     execjs (2.7.0)
     factory_bot (4.10.0)
@@ -134,6 +135,7 @@ GEM
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
+    json (2.1.0)
     launchy (2.4.3)
       addressable (~> 2.3)
     letter_opener (1.6.0)
@@ -259,6 +261,11 @@ GEM
     simple_form (4.0.1)
       actionpack (>= 5.0)
       activemodel (>= 5.0)
+    simplecov (0.16.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
     spring (2.0.2)
       activesupport (>= 4.2)
     spring-watcher-listen (2.0.1)
@@ -339,6 +346,7 @@ DEPENDENCIES
   sass-rails (~> 5.0)
   selenium-webdriver
   simple_form (~> 4.0)
+  simplecov
   spring
   spring-watcher-listen (~> 2.0.0)
   turbolinks (~> 5)
diff --git a/app/services/system_command.rb b/app/services/system_command.rb
index c8f052c..c4d3e7a 100644
--- a/app/services/system_command.rb
+++ b/app/services/system_command.rb
@@ -34,6 +34,7 @@ class SystemCommand
 
   private
 
+  # :nocov:
   def call(cmd)
     pid, _, stdout, stderr = Open4.popen4 cmd
     _, status = Process.waitpid2 pid
@@ -45,6 +46,7 @@ class SystemCommand
       stderr.read.strip,
     )
   end
+  # :nocov:
 
   def escape_arg(arg)
     arg.to_s.gsub('"') { '\"' }
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 2245dee..39e0d21 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,4 +1,15 @@
 ENV["RAILS_ENV"] ||= "test"
+require "pry"
+
+if !ENV["NO_COVERAGE"] && (ARGV.empty? || ARGV.include?("test/test_helper.rb"))
+  require "simplecov"
+  SimpleCov.start "rails" do
+    add_group "Services", "app/services"
+    add_group "Notifier", "app/notifier"
+    add_group "Policies", "app/policies"
+  end
+end
+
 require_relative "../config/environment"
 require "rails/test_help"