diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..76f9d43
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,52 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version:
+          - "3.0"
+          - "3.1"
+          - "3.2"
+        gemfile:
+          - Gemfile
+          - gemfiles/rails_7_0_propshaft.gemfile
+          - gemfiles/rails_7_1_propshaft.gemfile
+          - gemfiles/rails_main_propshaft.gemfile
+          - gemfiles/rails_7_0_sprockets.gemfile
+          - gemfiles/rails_7_1_sprockets.gemfile
+          - gemfiles/rails_main_sprockets.gemfile
+        continue-on-error: [ false ]
+
+    name: ${{ format('Tests (Ruby {0}, {1})', matrix.ruby-version, matrix.gemfile) }}
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.continue-on-error }}
+
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Remove Gemfile lock
+        run: |
+          rm -f $BUNDLE_GEMFILE.lock
+
+      - name: Install Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+
+      # This prevents a "Failed to build gem native extension" error when
+      # running `bundle install` inside a Rails app that is generated for
+      # testing. The error occurs only in CI, and only when using Ruby 3.0 and
+      # Rails >= 7.1.
+      - name: Install sass-embedded gem
+        if: ${{ matrix.ruby-version == '3.0' }}
+        run: gem install sass-embedded
+
+      - name: Run tests
+        run: |
+          bundle exec rake
diff --git a/.gitignore b/.gitignore
index b2a1445..f689000 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,6 @@
 .idea/
 **/tmp/
 /exe/*/tailwindcss
+
+# Ignore Gemfile.lock files for Rails main branch.
+/gemfiles/rails_main*.gemfile.lock
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..dd6b0c7
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,29 @@
+appraise "rails_7_0_sprockets" do
+  gem "rails", "~> 7.0.0"
+  gem "sprockets-rails"
+end
+
+appraise "rails_7_0_propshaft" do
+  gem "rails", "~> 7.0.0"
+  gem "propshaft"
+end
+
+appraise "rails_7_1_sprockets" do
+  gem "rails", "~> 7.1.0"
+  gem "sprockets-rails"
+end
+
+appraise "rails_7_1_propshaft" do
+  gem "rails", "~> 7.1.0"
+  gem "propshaft"
+end
+
+appraise "rails_main_sprockets" do
+  gem "rails", github: "rails/rails", branch: "main"
+  gem "sprockets-rails"
+end
+
+appraise "rails_main_propshaft" do
+  gem "rails", github: "rails/rails", branch: "main"
+  gem "propshaft"
+end
diff --git a/Gemfile b/Gemfile
index 5db3afe..41619eb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,10 +1,9 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
 gemspec
 
+gem "appraisal"
+gem "rails", "~> 6.1.0"
 gem "sqlite3"
 gem "debug", ">= 1.0.0"
-
-group :test do
-  gem "actionmailer", ">= 6.0.0"
-end
diff --git a/Gemfile.lock b/Gemfile.lock
index 18566c8..b1942c6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,96 +8,174 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (6.1.4.1)
-      actionpack (= 6.1.4.1)
-      actionview (= 6.1.4.1)
-      activejob (= 6.1.4.1)
-      activesupport (= 6.1.4.1)
+    actioncable (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      activejob (= 6.1.7.6)
+      activerecord (= 6.1.7.6)
+      activestorage (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+      mail (>= 2.7.1)
+    actionmailer (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      actionview (= 6.1.7.6)
+      activejob (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (6.1.4.1)
-      actionview (= 6.1.4.1)
-      activesupport (= 6.1.4.1)
+    actionpack (6.1.7.6)
+      actionview (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
       rack (~> 2.0, >= 2.0.9)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.2.0)
-    actionview (6.1.4.1)
-      activesupport (= 6.1.4.1)
+    actiontext (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      activerecord (= 6.1.7.6)
+      activestorage (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+      nokogiri (>= 1.8.5)
+    actionview (6.1.7.6)
+      activesupport (= 6.1.7.6)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.1, >= 1.2.0)
-    activejob (6.1.4.1)
-      activesupport (= 6.1.4.1)
+    activejob (6.1.7.6)
+      activesupport (= 6.1.7.6)
       globalid (>= 0.3.6)
-    activesupport (6.1.4.1)
+    activemodel (6.1.7.6)
+      activesupport (= 6.1.7.6)
+    activerecord (6.1.7.6)
+      activemodel (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+    activestorage (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      activejob (= 6.1.7.6)
+      activerecord (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+      marcel (~> 1.0)
+      mini_mime (>= 1.1.0)
+    activesupport (6.1.7.6)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
       zeitwerk (~> 2.3)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
     builder (3.2.4)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.2.2)
     crass (1.0.6)
+    date (3.3.4)
     debug (1.1.0)
       irb
       reline (>= 0.2.7)
-    erubi (1.10.0)
-    globalid (1.0.0)
-      activesupport (>= 5.0)
+    erubi (1.12.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
     google-protobuf (3.23.3)
-    i18n (1.8.11)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     io-console (0.5.9)
     irb (1.3.7)
       reline (>= 0.2.7)
-    loofah (2.12.0)
+    loofah (2.22.0)
       crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
-    mail (2.7.1)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
       mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.2)
     method_source (1.0.0)
-    mini_mime (1.1.2)
-    mini_portile2 (2.6.1)
-    minitest (5.14.4)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    mini_mime (1.1.5)
+    mini_portile2 (2.8.5)
+    minitest (5.20.0)
+    net-imap (0.4.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.4.0)
+      net-protocol
+    nio4r (2.7.0)
+    nokogiri (1.15.5)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    racc (1.6.0)
-    rack (2.2.3)
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
-    rails-dom-testing (2.0.3)
-      activesupport (>= 4.2.0)
+    racc (1.7.3)
+    rack (2.2.8)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails (6.1.7.6)
+      actioncable (= 6.1.7.6)
+      actionmailbox (= 6.1.7.6)
+      actionmailer (= 6.1.7.6)
+      actionpack (= 6.1.7.6)
+      actiontext (= 6.1.7.6)
+      actionview (= 6.1.7.6)
+      activejob (= 6.1.7.6)
+      activemodel (= 6.1.7.6)
+      activerecord (= 6.1.7.6)
+      activestorage (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+      bundler (>= 1.15.0)
+      railties (= 6.1.7.6)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.2)
-      loofah (~> 2.3)
-    railties (6.1.4.1)
-      actionpack (= 6.1.4.1)
-      activesupport (= 6.1.4.1)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (6.1.7.6)
+      actionpack (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
       method_source
-      rake (>= 0.13)
+      rake (>= 12.2)
       thor (~> 1.0)
-    rake (13.0.6)
+    rake (13.1.0)
     reline (0.2.7)
       io-console (~> 0.5)
     sass-embedded (1.63.4)
       google-protobuf (~> 3.23)
       rake (>= 13.0.0)
+    sprockets (4.2.1)
+      concurrent-ruby (~> 1.0)
+      rack (>= 2.2.4, < 4)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      sprockets (>= 3.0.0)
     sqlite3 (1.4.2)
-    thor (1.2.2)
-    tzinfo (2.0.4)
+    thor (1.3.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    zeitwerk (2.5.1)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.6.12)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  actionmailer (>= 6.0.0)
+  appraisal
   dartsass-rails!
   debug (>= 1.0.0)
+  rails (~> 6.1.0)
   sqlite3
 
 BUNDLED WITH
diff --git a/README.md b/README.md
index 6bd4a7f..0ac9db9 100644
--- a/README.md
+++ b/README.md
@@ -115,7 +115,7 @@ the Dart Sass process is most likely not running.
 
 ##### Solution
 
-Make sure the Dart Sass process is running by starting the Rails sever by
+Make sure the Dart Sass process is running by starting the Rails server by
 running: `./bin/dev`.
 
 #### Running continuous integration pipelines
diff --git a/gemfiles/rails_7_0_propshaft.gemfile b/gemfiles/rails_7_0_propshaft.gemfile
new file mode 100644
index 0000000..1d545f8
--- /dev/null
+++ b/gemfiles/rails_7_0_propshaft.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", "~> 7.0.0"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "propshaft"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7_0_propshaft.gemfile.lock b/gemfiles/rails_7_0_propshaft.gemfile.lock
new file mode 100644
index 0000000..60da9e6
--- /dev/null
+++ b/gemfiles/rails_7_0_propshaft.gemfile.lock
@@ -0,0 +1,190 @@
+PATH
+  remote: ..
+  specs:
+    dartsass-rails (0.5.0)
+      railties (>= 6.0.0)
+      sass-embedded (~> 1.63)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (7.0.8)
+      actionpack (= 7.0.8)
+      activesupport (= 7.0.8)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (7.0.8)
+      actionpack (= 7.0.8)
+      activejob (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      mail (>= 2.7.1)
+      net-imap
+      net-pop
+      net-smtp
+    actionmailer (7.0.8)
+      actionpack (= 7.0.8)
+      actionview (= 7.0.8)
+      activejob (= 7.0.8)
+      activesupport (= 7.0.8)
+      mail (~> 2.5, >= 2.5.4)
+      net-imap
+      net-pop
+      net-smtp
+      rails-dom-testing (~> 2.0)
+    actionpack (7.0.8)
+      actionview (= 7.0.8)
+      activesupport (= 7.0.8)
+      rack (~> 2.0, >= 2.2.4)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (7.0.8)
+      actionpack (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      globalid (>= 0.6.0)
+      nokogiri (>= 1.8.5)
+    actionview (7.0.8)
+      activesupport (= 7.0.8)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (7.0.8)
+      activesupport (= 7.0.8)
+      globalid (>= 0.3.6)
+    activemodel (7.0.8)
+      activesupport (= 7.0.8)
+    activerecord (7.0.8)
+      activemodel (= 7.0.8)
+      activesupport (= 7.0.8)
+    activestorage (7.0.8)
+      actionpack (= 7.0.8)
+      activejob (= 7.0.8)
+      activerecord (= 7.0.8)
+      activesupport (= 7.0.8)
+      marcel (~> 1.0)
+      mini_mime (>= 1.1.0)
+    activesupport (7.0.8)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    builder (3.2.4)
+    concurrent-ruby (1.2.2)
+    crass (1.0.6)
+    date (3.3.4)
+    debug (1.8.0)
+      irb (>= 1.5.0)
+      reline (>= 0.3.1)
+    erubi (1.12.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    google-protobuf (3.25.1-x86_64-linux)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    io-console (0.6.0)
+    irb (1.9.1)
+      rdoc
+      reline (>= 0.3.8)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.2)
+    method_source (1.0.0)
+    mini_mime (1.1.5)
+    minitest (5.20.0)
+    net-imap (0.4.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.4.0)
+      net-protocol
+    nio4r (2.7.0)
+    nokogiri (1.15.5-x86_64-linux)
+      racc (~> 1.4)
+    propshaft (0.8.0)
+      actionpack (>= 7.0.0)
+      activesupport (>= 7.0.0)
+      rack
+      railties (>= 7.0.0)
+    psych (5.1.1.1)
+      stringio
+    racc (1.7.3)
+    rack (2.2.8)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails (7.0.8)
+      actioncable (= 7.0.8)
+      actionmailbox (= 7.0.8)
+      actionmailer (= 7.0.8)
+      actionpack (= 7.0.8)
+      actiontext (= 7.0.8)
+      actionview (= 7.0.8)
+      activejob (= 7.0.8)
+      activemodel (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      bundler (>= 1.15.0)
+      railties (= 7.0.8)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (7.0.8)
+      actionpack (= 7.0.8)
+      activesupport (= 7.0.8)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
+      zeitwerk (~> 2.5)
+    rake (13.1.0)
+    rdoc (6.6.0)
+      psych (>= 4.0.0)
+    reline (0.4.1)
+      io-console (~> 0.5)
+    sass-embedded (1.69.5-x86_64-linux-gnu)
+      google-protobuf (~> 3.23)
+    sqlite3 (1.6.9-x86_64-linux)
+    stringio (3.1.0)
+    thor (1.3.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.6.12)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  dartsass-rails!
+  debug (>= 1.0.0)
+  propshaft
+  rails (~> 7.0.0)
+  sqlite3
+
+BUNDLED WITH
+   2.2.32
diff --git a/gemfiles/rails_7_0_sprockets.gemfile b/gemfiles/rails_7_0_sprockets.gemfile
new file mode 100644
index 0000000..c55d639
--- /dev/null
+++ b/gemfiles/rails_7_0_sprockets.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", "~> 7.0.0"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "sprockets-rails"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7_0_sprockets.gemfile.lock b/gemfiles/rails_7_0_sprockets.gemfile.lock
new file mode 100644
index 0000000..28be6c4
--- /dev/null
+++ b/gemfiles/rails_7_0_sprockets.gemfile.lock
@@ -0,0 +1,192 @@
+PATH
+  remote: ..
+  specs:
+    dartsass-rails (0.5.0)
+      railties (>= 6.0.0)
+      sass-embedded (~> 1.63)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (7.0.8)
+      actionpack (= 7.0.8)
+      activesupport (= 7.0.8)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (7.0.8)
+      actionpack (= 7.0.8)
+      activejob (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      mail (>= 2.7.1)
+      net-imap
+      net-pop
+      net-smtp
+    actionmailer (7.0.8)
+      actionpack (= 7.0.8)
+      actionview (= 7.0.8)
+      activejob (= 7.0.8)
+      activesupport (= 7.0.8)
+      mail (~> 2.5, >= 2.5.4)
+      net-imap
+      net-pop
+      net-smtp
+      rails-dom-testing (~> 2.0)
+    actionpack (7.0.8)
+      actionview (= 7.0.8)
+      activesupport (= 7.0.8)
+      rack (~> 2.0, >= 2.2.4)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (7.0.8)
+      actionpack (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      globalid (>= 0.6.0)
+      nokogiri (>= 1.8.5)
+    actionview (7.0.8)
+      activesupport (= 7.0.8)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (7.0.8)
+      activesupport (= 7.0.8)
+      globalid (>= 0.3.6)
+    activemodel (7.0.8)
+      activesupport (= 7.0.8)
+    activerecord (7.0.8)
+      activemodel (= 7.0.8)
+      activesupport (= 7.0.8)
+    activestorage (7.0.8)
+      actionpack (= 7.0.8)
+      activejob (= 7.0.8)
+      activerecord (= 7.0.8)
+      activesupport (= 7.0.8)
+      marcel (~> 1.0)
+      mini_mime (>= 1.1.0)
+    activesupport (7.0.8)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    builder (3.2.4)
+    concurrent-ruby (1.2.2)
+    crass (1.0.6)
+    date (3.3.4)
+    debug (1.8.0)
+      irb (>= 1.5.0)
+      reline (>= 0.3.1)
+    erubi (1.12.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    google-protobuf (3.25.1-x86_64-linux)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    io-console (0.6.0)
+    irb (1.9.1)
+      rdoc
+      reline (>= 0.3.8)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.2)
+    method_source (1.0.0)
+    mini_mime (1.1.5)
+    minitest (5.20.0)
+    net-imap (0.4.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.4.0)
+      net-protocol
+    nio4r (2.7.0)
+    nokogiri (1.15.5-x86_64-linux)
+      racc (~> 1.4)
+    psych (5.1.1.1)
+      stringio
+    racc (1.7.3)
+    rack (2.2.8)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails (7.0.8)
+      actioncable (= 7.0.8)
+      actionmailbox (= 7.0.8)
+      actionmailer (= 7.0.8)
+      actionpack (= 7.0.8)
+      actiontext (= 7.0.8)
+      actionview (= 7.0.8)
+      activejob (= 7.0.8)
+      activemodel (= 7.0.8)
+      activerecord (= 7.0.8)
+      activestorage (= 7.0.8)
+      activesupport (= 7.0.8)
+      bundler (>= 1.15.0)
+      railties (= 7.0.8)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (7.0.8)
+      actionpack (= 7.0.8)
+      activesupport (= 7.0.8)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
+      zeitwerk (~> 2.5)
+    rake (13.1.0)
+    rdoc (6.6.0)
+      psych (>= 4.0.0)
+    reline (0.4.1)
+      io-console (~> 0.5)
+    sass-embedded (1.69.5-x86_64-linux-gnu)
+      google-protobuf (~> 3.23)
+    sprockets (4.2.1)
+      concurrent-ruby (~> 1.0)
+      rack (>= 2.2.4, < 4)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.6.9-x86_64-linux)
+    stringio (3.1.0)
+    thor (1.3.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.6.12)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  dartsass-rails!
+  debug (>= 1.0.0)
+  rails (~> 7.0.0)
+  sprockets-rails
+  sqlite3
+
+BUNDLED WITH
+   2.2.32
diff --git a/gemfiles/rails_7_1_propshaft.gemfile b/gemfiles/rails_7_1_propshaft.gemfile
new file mode 100644
index 0000000..1c990c0
--- /dev/null
+++ b/gemfiles/rails_7_1_propshaft.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", "~> 7.1.0"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "propshaft"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7_1_propshaft.gemfile.lock b/gemfiles/rails_7_1_propshaft.gemfile.lock
new file mode 100644
index 0000000..a65e679
--- /dev/null
+++ b/gemfiles/rails_7_1_propshaft.gemfile.lock
@@ -0,0 +1,212 @@
+PATH
+  remote: ..
+  specs:
+    dartsass-rails (0.5.0)
+      railties (>= 6.0.0)
+      sass-embedded (~> 1.63)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (7.1.2)
+      actionpack (= 7.1.2)
+      activesupport (= 7.1.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+      zeitwerk (~> 2.6)
+    actionmailbox (7.1.2)
+      actionpack (= 7.1.2)
+      activejob (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      mail (>= 2.7.1)
+      net-imap
+      net-pop
+      net-smtp
+    actionmailer (7.1.2)
+      actionpack (= 7.1.2)
+      actionview (= 7.1.2)
+      activejob (= 7.1.2)
+      activesupport (= 7.1.2)
+      mail (~> 2.5, >= 2.5.4)
+      net-imap
+      net-pop
+      net-smtp
+      rails-dom-testing (~> 2.2)
+    actionpack (7.1.2)
+      actionview (= 7.1.2)
+      activesupport (= 7.1.2)
+      nokogiri (>= 1.8.5)
+      racc
+      rack (>= 2.2.4)
+      rack-session (>= 1.0.1)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    actiontext (7.1.2)
+      actionpack (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      globalid (>= 0.6.0)
+      nokogiri (>= 1.8.5)
+    actionview (7.1.2)
+      activesupport (= 7.1.2)
+      builder (~> 3.1)
+      erubi (~> 1.11)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    activejob (7.1.2)
+      activesupport (= 7.1.2)
+      globalid (>= 0.3.6)
+    activemodel (7.1.2)
+      activesupport (= 7.1.2)
+    activerecord (7.1.2)
+      activemodel (= 7.1.2)
+      activesupport (= 7.1.2)
+      timeout (>= 0.4.0)
+    activestorage (7.1.2)
+      actionpack (= 7.1.2)
+      activejob (= 7.1.2)
+      activerecord (= 7.1.2)
+      activesupport (= 7.1.2)
+      marcel (~> 1.0)
+    activesupport (7.1.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.4)
+    builder (3.2.4)
+    concurrent-ruby (1.2.2)
+    connection_pool (2.4.1)
+    crass (1.0.6)
+    date (3.3.4)
+    debug (1.8.0)
+      irb (>= 1.5.0)
+      reline (>= 0.3.1)
+    drb (2.2.0)
+      ruby2_keywords
+    erubi (1.12.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    google-protobuf (3.25.1-x86_64-linux)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    io-console (0.6.0)
+    irb (1.9.1)
+      rdoc
+      reline (>= 0.3.8)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.2)
+    mini_mime (1.1.5)
+    minitest (5.20.0)
+    mutex_m (0.2.0)
+    net-imap (0.4.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.4.0)
+      net-protocol
+    nio4r (2.7.0)
+    nokogiri (1.15.5-x86_64-linux)
+      racc (~> 1.4)
+    propshaft (0.8.0)
+      actionpack (>= 7.0.0)
+      activesupport (>= 7.0.0)
+      rack
+      railties (>= 7.0.0)
+    psych (5.1.1.1)
+      stringio
+    racc (1.7.3)
+    rack (3.0.8)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
+    rails (7.1.2)
+      actioncable (= 7.1.2)
+      actionmailbox (= 7.1.2)
+      actionmailer (= 7.1.2)
+      actionpack (= 7.1.2)
+      actiontext (= 7.1.2)
+      actionview (= 7.1.2)
+      activejob (= 7.1.2)
+      activemodel (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      bundler (>= 1.15.0)
+      railties (= 7.1.2)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (7.1.2)
+      actionpack (= 7.1.2)
+      activesupport (= 7.1.2)
+      irb
+      rackup (>= 1.0.0)
+      rake (>= 12.2)
+      thor (~> 1.0, >= 1.2.2)
+      zeitwerk (~> 2.6)
+    rake (13.1.0)
+    rdoc (6.6.0)
+      psych (>= 4.0.0)
+    reline (0.4.1)
+      io-console (~> 0.5)
+    ruby2_keywords (0.0.5)
+    sass-embedded (1.69.5-x86_64-linux-gnu)
+      google-protobuf (~> 3.23)
+    sqlite3 (1.6.9-x86_64-linux)
+    stringio (3.1.0)
+    thor (1.3.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    webrick (1.8.1)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.6.12)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  dartsass-rails!
+  debug (>= 1.0.0)
+  propshaft
+  rails (~> 7.1.0)
+  sqlite3
+
+BUNDLED WITH
+   2.2.32
diff --git a/gemfiles/rails_7_1_sprockets.gemfile b/gemfiles/rails_7_1_sprockets.gemfile
new file mode 100644
index 0000000..074b901
--- /dev/null
+++ b/gemfiles/rails_7_1_sprockets.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", "~> 7.1.0"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "sprockets-rails"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7_1_sprockets.gemfile.lock b/gemfiles/rails_7_1_sprockets.gemfile.lock
new file mode 100644
index 0000000..fb1cb6a
--- /dev/null
+++ b/gemfiles/rails_7_1_sprockets.gemfile.lock
@@ -0,0 +1,214 @@
+PATH
+  remote: ..
+  specs:
+    dartsass-rails (0.5.0)
+      railties (>= 6.0.0)
+      sass-embedded (~> 1.63)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (7.1.2)
+      actionpack (= 7.1.2)
+      activesupport (= 7.1.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+      zeitwerk (~> 2.6)
+    actionmailbox (7.1.2)
+      actionpack (= 7.1.2)
+      activejob (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      mail (>= 2.7.1)
+      net-imap
+      net-pop
+      net-smtp
+    actionmailer (7.1.2)
+      actionpack (= 7.1.2)
+      actionview (= 7.1.2)
+      activejob (= 7.1.2)
+      activesupport (= 7.1.2)
+      mail (~> 2.5, >= 2.5.4)
+      net-imap
+      net-pop
+      net-smtp
+      rails-dom-testing (~> 2.2)
+    actionpack (7.1.2)
+      actionview (= 7.1.2)
+      activesupport (= 7.1.2)
+      nokogiri (>= 1.8.5)
+      racc
+      rack (>= 2.2.4)
+      rack-session (>= 1.0.1)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    actiontext (7.1.2)
+      actionpack (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      globalid (>= 0.6.0)
+      nokogiri (>= 1.8.5)
+    actionview (7.1.2)
+      activesupport (= 7.1.2)
+      builder (~> 3.1)
+      erubi (~> 1.11)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    activejob (7.1.2)
+      activesupport (= 7.1.2)
+      globalid (>= 0.3.6)
+    activemodel (7.1.2)
+      activesupport (= 7.1.2)
+    activerecord (7.1.2)
+      activemodel (= 7.1.2)
+      activesupport (= 7.1.2)
+      timeout (>= 0.4.0)
+    activestorage (7.1.2)
+      actionpack (= 7.1.2)
+      activejob (= 7.1.2)
+      activerecord (= 7.1.2)
+      activesupport (= 7.1.2)
+      marcel (~> 1.0)
+    activesupport (7.1.2)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.4)
+    builder (3.2.4)
+    concurrent-ruby (1.2.2)
+    connection_pool (2.4.1)
+    crass (1.0.6)
+    date (3.3.4)
+    debug (1.8.0)
+      irb (>= 1.5.0)
+      reline (>= 0.3.1)
+    drb (2.2.0)
+      ruby2_keywords
+    erubi (1.12.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    google-protobuf (3.25.1-x86_64-linux)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    io-console (0.6.0)
+    irb (1.9.1)
+      rdoc
+      reline (>= 0.3.8)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.2)
+    mini_mime (1.1.5)
+    minitest (5.20.0)
+    mutex_m (0.2.0)
+    net-imap (0.4.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.4.0)
+      net-protocol
+    nio4r (2.7.0)
+    nokogiri (1.15.5-x86_64-linux)
+      racc (~> 1.4)
+    psych (5.1.1.1)
+      stringio
+    racc (1.7.3)
+    rack (3.0.8)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
+    rails (7.1.2)
+      actioncable (= 7.1.2)
+      actionmailbox (= 7.1.2)
+      actionmailer (= 7.1.2)
+      actionpack (= 7.1.2)
+      actiontext (= 7.1.2)
+      actionview (= 7.1.2)
+      activejob (= 7.1.2)
+      activemodel (= 7.1.2)
+      activerecord (= 7.1.2)
+      activestorage (= 7.1.2)
+      activesupport (= 7.1.2)
+      bundler (>= 1.15.0)
+      railties (= 7.1.2)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (7.1.2)
+      actionpack (= 7.1.2)
+      activesupport (= 7.1.2)
+      irb
+      rackup (>= 1.0.0)
+      rake (>= 12.2)
+      thor (~> 1.0, >= 1.2.2)
+      zeitwerk (~> 2.6)
+    rake (13.1.0)
+    rdoc (6.6.0)
+      psych (>= 4.0.0)
+    reline (0.4.1)
+      io-console (~> 0.5)
+    ruby2_keywords (0.0.5)
+    sass-embedded (1.69.5-x86_64-linux-gnu)
+      google-protobuf (~> 3.23)
+    sprockets (4.2.1)
+      concurrent-ruby (~> 1.0)
+      rack (>= 2.2.4, < 4)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.6.9-x86_64-linux)
+    stringio (3.1.0)
+    thor (1.3.0)
+    timeout (0.4.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    webrick (1.8.1)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.6.12)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  dartsass-rails!
+  debug (>= 1.0.0)
+  rails (~> 7.1.0)
+  sprockets-rails
+  sqlite3
+
+BUNDLED WITH
+   2.2.32
diff --git a/gemfiles/rails_main_propshaft.gemfile b/gemfiles/rails_main_propshaft.gemfile
new file mode 100644
index 0000000..b72b45b
--- /dev/null
+++ b/gemfiles/rails_main_propshaft.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", branch: "main", git: "https://github.com/rails/rails.git"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "propshaft"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_main_sprockets.gemfile b/gemfiles/rails_main_sprockets.gemfile
new file mode 100644
index 0000000..1b35512
--- /dev/null
+++ b/gemfiles/rails_main_sprockets.gemfile
@@ -0,0 +1,11 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal"
+gem "rails", branch: "main", git: "https://github.com/rails/rails.git"
+gem "sqlite3"
+gem "debug", ">= 1.0.0"
+gem "sprockets-rails"
+
+gemspec path: "../"
diff --git a/test/installer_test.rb b/test/installer_test.rb
new file mode 100644
index 0000000..4921f95
--- /dev/null
+++ b/test/installer_test.rb
@@ -0,0 +1,71 @@
+require "test_helper"
+
+class InstallerTest < ActiveSupport::TestCase
+  include RailsAppHelpers
+
+  test "installer" do
+    with_new_rails_app do
+      out, _err = run_command("bin/rails", "dartsass:install")
+
+      assert_match "<DONE>", out
+      assert_equal 0, File.size("app/assets/builds/.keep")
+      assert_match "/app/assets/builds/*\n!/app/assets/builds/.keep", File.read(".gitignore")
+      assert_equal File.read("#{__dir__}/../lib/install/application.scss"), File.read("app/assets/stylesheets/application.scss")
+      assert_equal File.read("#{__dir__}/../lib/install/Procfile.dev"), File.read("Procfile.dev")
+      assert_equal File.read("#{__dir__}/../lib/install/dev"), File.read("bin/dev")
+      assert_equal 0700, File.stat("bin/dev").mode & 0700
+
+      if sprockets?
+        assert_match "//= link_tree ../builds", File.read("app/assets/config/manifest.js")
+        assert_no_match "//= link_directory ../stylesheets .css", File.read("app/assets/config/manifest.js")
+      end
+    end
+  end
+
+  test "installer with missing .gitignore" do
+    with_new_rails_app do
+      FileUtils.rm(".gitignore")
+      out, _err = run_command("bin/rails", "dartsass:install")
+
+      assert_match "<DONE>", out
+      assert_not File.exist?(".gitignore")
+    end
+  end
+
+  test "installer with pre-existing application.scss" do
+    with_new_rails_app do
+      File.write("app/assets/stylesheets/application.scss", "// pre-existing")
+      out, _err = run_command("bin/rails", "dartsass:install")
+
+      assert_match "<DONE>", out
+      assert_equal "// pre-existing", File.read("app/assets/stylesheets/application.scss")
+    end
+  end
+
+  test "installer with pre-existing Procfile" do
+    with_new_rails_app do
+      File.write("Procfile.dev", "pre: existing\n")
+      out, _err = run_command("bin/rails", "dartsass:install")
+
+      assert_match "<DONE>", out
+      assert_equal "pre: existing\ncss: bin/rails dartsass:watch\n", File.read("Procfile.dev")
+    end
+  end
+
+  private
+    def with_new_rails_app(&block)
+      super do
+        # Override `dartsass:build` to check that installation completed and to reduce test run time.
+        File.write("Rakefile", <<~RAKEFILE, mode: "a+")
+          Rake::Task["dartsass:build"].clear
+          namespace :dartsass do
+            task build: :environment do
+              puts "<DONE>"
+            end
+          end
+        RAKEFILE
+
+        block.call
+      end
+    end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
new file mode 100644
index 0000000..a8c6aaa
--- /dev/null
+++ b/test/test_helper.rb
@@ -0,0 +1,78 @@
+# Configure Rails Environment
+ENV["RAILS_ENV"] = "test"
+
+require "fileutils"
+require "rails"
+require "rails/test_help"
+
+module RailsAppHelpers
+  def self.included(base)
+    base.include ActiveSupport::Testing::Isolation
+  end
+
+  private
+    def sprockets?
+      Gem.loaded_specs.key?("sprockets-rails")
+    end
+
+    def propshaft?
+      Gem.loaded_specs.key?("propshaft")
+    end
+
+    def asset_pipeline_option
+      if Rails::VERSION::MAJOR >= 7
+        if propshaft?
+          "--asset-pipeline=propshaft"
+        elsif sprockets?
+          "--asset-pipeline=sprockets"
+        end
+      end
+    end
+
+    def create_new_rails_app(app_dir)
+      require "rails/generators/rails/app/app_generator"
+      Rails::Generators::AppGenerator.start([app_dir, *asset_pipeline_option, "--skip-bundle", "--skip-bootsnap", "--quiet"])
+
+      Dir.chdir(app_dir) do
+        gemfile = File.read("Gemfile")
+
+        gemfile.gsub!(/^gem ["']sassc?-rails["'].*/, "") # for Rails 6.1 and 7.0
+        gemfile.gsub!(/^gem ["']dartsass-rails["'].*/, "")
+        gemfile << %(gem "dartsass-rails", path: #{File.expand_path("..", __dir__).inspect}\n)
+
+        if Rails::VERSION::PRE == "alpha"
+          gemfile.gsub!(/^gem ["']rails["'].*/, "")
+          gemfile << %(gem "rails", path: #{Gem.loaded_specs["rails"].full_gem_path.inspect}\n)
+        end
+
+        File.write("Gemfile", gemfile)
+
+        run_command("bundle", "install")
+      end
+    end
+
+    def with_new_rails_app(&block)
+      require "digest/sha1"
+      variant = [RUBY_VERSION, Gem.loaded_specs["rails"].full_gem_path, asset_pipeline_option]
+      app_name = "app_#{Digest::SHA1.hexdigest(variant.to_s)}"
+      cache_dir = "#{__dir__}/../tmp"
+      FileUtils.mkdir_p(cache_dir)
+
+      Dir.mktmpdir do |tmpdir|
+        if Dir.exist?("#{cache_dir}/#{app_name}")
+          FileUtils.cp_r("#{cache_dir}/#{app_name}", tmpdir)
+        else
+          create_new_rails_app("#{tmpdir}/#{app_name}")
+          FileUtils.cp_r("#{tmpdir}/#{app_name}", cache_dir) # Cache app for future runs.
+        end
+
+        Dir.chdir("#{tmpdir}/#{app_name}", &block)
+      end
+    end
+
+    def run_command(*command)
+      Bundler.with_unbundled_env do
+        capture_subprocess_io { system(*command, exception: true) }
+      end
+    end
+end