diff --git a/.gitignore b/.gitignore
index b32c02c..597e4b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,6 @@
 
 # Ignore ~ files
 *~
+
+# Ignore simplecov coverage report
+/coverage
diff --git a/Gemfile b/Gemfile
index 2da93a8..c244391 100644
--- a/Gemfile
+++ b/Gemfile
@@ -50,6 +50,9 @@ group :development, :test do
 
   # Rubocul for linting
   gem 'rubocul', '~> 4.0'
+
+  # simplecov for test coverage
+  gem 'simplecov', '~> 0.22', require: false
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 2ade0b1..d185732 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -117,6 +117,7 @@ GEM
       responders
       warden (~> 1.2.3)
     diff-lcs (1.5.0)
+    docile (1.4.1)
     drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)
@@ -318,6 +319,12 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.13.1)
+    simplecov_json_formatter (0.1.4)
     spring (4.1.3)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -379,6 +386,7 @@ DEPENDENCIES
   rubocul (~> 4.0)
   rubyzip
   sass-rails (~> 5.0)
+  simplecov (~> 0.22)
   spring
   sqlite3 (~> 1.4)
   turbolinks
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ce33d66..701b601 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,9 @@
+require 'simplecov'
+SimpleCov.start 'rails' do
+  # Ignore the following because we're not using these rails features right now:
+  add_filter 'app/mailers'
+end
+
 # This file was generated by the `rails generate rspec:install` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause