diff --git a/.gitignore b/.gitignore
index afec83b..8618e82 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 /gemfiles/.bundle/config
 
 /_misc/
+/coverage/
 /spec/dummy/db/*.sqlite3*
 /spec/dummy/log/
 /spec/dummy/storage/
diff --git a/Gemfile b/Gemfile
index ef8f360..969a73c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,7 @@ if ENV['DEVEL'] == '1'
 
   gem 'activeadmin', ENV.fetch('ACTIVEADMIN_VERSION')
   gem 'activeadmin_dynamic_fields', path: './'
+  gem 'appraisal', '~> 2.4'
 
   if rails_ver.start_with?('7.0')
     gem 'concurrent-ruby', '1.3.4'
@@ -31,6 +32,7 @@ gem 'cuprite'
 gem 'rspec_junit_formatter'
 gem 'rspec-rails'
 gem 'rspec-retry'
+gem 'simplecov', require: false
 
 # Linters
 gem 'fasterer'
diff --git a/gemfiles/rails61_activeadmin.gemfile b/gemfiles/rails61_activeadmin.gemfile
index 4965457..060f9da 100644
--- a/gemfiles/rails61_activeadmin.gemfile
+++ b/gemfiles/rails61_activeadmin.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 6.1.0"
+gem "activeadmin"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3", "~> 1.7.0"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,9 +25,4 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin"
-gem "rails", "~> 6.1.0"
 gem "nokogiri", "~> 1.17.2"
-gem "sqlite3", "~> 1.7.0"
-
-gemspec path: "../"
diff --git a/gemfiles/rails61_activeadmin29.gemfile b/gemfiles/rails61_activeadmin29.gemfile
index 82bc1e0..0eae714 100644
--- a/gemfiles/rails61_activeadmin29.gemfile
+++ b/gemfiles/rails61_activeadmin29.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 6.1.0"
+gem "activeadmin", "~> 2.9.0"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3", "~> 1.7.0"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,9 +25,4 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin", "~> 2.9.0"
-gem "rails", "~> 6.1.0"
 gem "nokogiri", "~> 1.17.2"
-gem "sqlite3", "~> 1.7.0"
-
-gemspec path: "../"
diff --git a/gemfiles/rails70_activeadmin.gemfile b/gemfiles/rails70_activeadmin.gemfile
index 3d1d12e..ba8b80b 100644
--- a/gemfiles/rails70_activeadmin.gemfile
+++ b/gemfiles/rails70_activeadmin.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 7.0.0"
+gem "activeadmin"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3", "~> 1.7.0"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,9 +25,4 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin"
-gem "rails", "~> 7.0.0"
 gem "nokogiri", "~> 1.17.2"
-gem "sqlite3", "~> 1.7.0"
-
-gemspec path: "../"
diff --git a/gemfiles/rails70_activeadmin.gemfile.lock b/gemfiles/rails70_activeadmin.gemfile.lock
index 40fc86e..cea0736 100644
--- a/gemfiles/rails70_activeadmin.gemfile.lock
+++ b/gemfiles/rails70_activeadmin.gemfile.lock
@@ -112,6 +112,7 @@ GEM
       ferrum (~> 0.13.0)
     date (3.3.3)
     diff-lcs (1.5.0)
+    docile (1.4.1)
     erubi (1.12.0)
     fasterer (0.10.1)
       colorize (~> 0.7)
@@ -167,6 +168,7 @@ GEM
     matrix (0.4.2)
     method_source (1.0.0)
     mini_mime (1.1.5)
+    mini_portile2 (2.8.8)
     minitest (5.20.0)
     mutex_m (0.3.0)
     net-imap (0.3.7)
@@ -179,7 +181,8 @@ GEM
     net-smtp (0.3.3)
       net-protocol
     nio4r (2.5.9)
-    nokogiri (1.17.2-x86_64-linux)
+    nokogiri (1.17.2)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.23.0)
     parser (3.2.2.3)
@@ -295,6 +298,12 @@ GEM
     sassc (2.4.0)
       ffi (~> 1.9)
     sexp_processor (4.17.0)
+    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)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -302,7 +311,8 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    sqlite3 (1.7.3-x86_64-linux)
+    sqlite3 (1.7.3)
+      mini_portile2 (~> 2.8.0)
     thor (1.2.2)
     timeout (0.4.0)
     tzinfo (2.0.6)
@@ -341,6 +351,7 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   sassc
+  simplecov
   sprockets-rails
   sqlite3 (~> 1.7.0)
 
diff --git a/gemfiles/rails71_activeadmin.gemfile b/gemfiles/rails71_activeadmin.gemfile
index 1bc5560..f066c10 100644
--- a/gemfiles/rails71_activeadmin.gemfile
+++ b/gemfiles/rails71_activeadmin.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 7.1.0"
+gem "activeadmin"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,8 +25,3 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin"
-gem "rails", "~> 7.1.0"
-gem "sqlite3"
-
-gemspec path: "../"
diff --git a/gemfiles/rails71_activeadmin.gemfile.lock b/gemfiles/rails71_activeadmin.gemfile.lock
index cbdd232..815869e 100644
--- a/gemfiles/rails71_activeadmin.gemfile.lock
+++ b/gemfiles/rails71_activeadmin.gemfile.lock
@@ -127,6 +127,7 @@ GEM
       ferrum (~> 0.15.0)
     date (3.4.1)
     diff-lcs (1.6.0)
+    docile (1.4.1)
     drb (2.2.1)
     erubi (1.13.1)
     fasterer (0.11.0)
@@ -331,6 +332,12 @@ GEM
       ffi (~> 1.9)
     securerandom (0.4.1)
     sexp_processor (4.17.3)
+    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)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -380,6 +387,7 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   sassc
+  simplecov
   sprockets-rails
   sqlite3
 
diff --git a/gemfiles/rails72_activeadmin.gemfile b/gemfiles/rails72_activeadmin.gemfile
index c2a6ff0..5b0b42c 100644
--- a/gemfiles/rails72_activeadmin.gemfile
+++ b/gemfiles/rails72_activeadmin.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 7.2.0"
+gem "activeadmin"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,8 +25,3 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin"
-gem "rails", "~> 7.2.0"
-gem "sqlite3"
-
-gemspec path: "../"
diff --git a/gemfiles/rails72_activeadmin.gemfile.lock b/gemfiles/rails72_activeadmin.gemfile.lock
index 7017685..4605510 100644
--- a/gemfiles/rails72_activeadmin.gemfile.lock
+++ b/gemfiles/rails72_activeadmin.gemfile.lock
@@ -121,6 +121,7 @@ GEM
       ferrum (~> 0.15.0)
     date (3.4.1)
     diff-lcs (1.6.0)
+    docile (1.4.1)
     drb (2.2.1)
     erubi (1.13.1)
     fasterer (0.11.0)
@@ -325,6 +326,12 @@ GEM
       ffi (~> 1.9)
     securerandom (0.4.1)
     sexp_processor (4.17.3)
+    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)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -375,6 +382,7 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   sassc
+  simplecov
   sprockets-rails
   sqlite3
 
diff --git a/gemfiles/rails80_activeadmin.gemfile b/gemfiles/rails80_activeadmin.gemfile
index b4180e1..617a8d5 100644
--- a/gemfiles/rails80_activeadmin.gemfile
+++ b/gemfiles/rails80_activeadmin.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rails", "~> 8.0.0"
+gem "activeadmin"
+gem "activeadmin_dynamic_fields", path: "../"
+gem "appraisal", "~> 2.4"
+gem "sqlite3"
 gem "bigdecimal"
 gem "mutex_m"
 gem "puma"
@@ -12,6 +17,7 @@ gem "cuprite"
 gem "rspec_junit_formatter"
 gem "rspec-rails"
 gem "rspec-retry"
+gem "simplecov", require: false
 gem "fasterer"
 gem "rubocop"
 gem "rubocop-packaging"
@@ -19,8 +25,3 @@ gem "rubocop-performance"
 gem "rubocop-rails"
 gem "rubocop-rspec"
 gem "pry-rails"
-gem "activeadmin"
-gem "rails", "~> 8.0.0"
-gem "sqlite3"
-
-gemspec path: "../"
diff --git a/gemfiles/rails80_activeadmin.gemfile.lock b/gemfiles/rails80_activeadmin.gemfile.lock
index a911266..fa82d05 100644
--- a/gemfiles/rails80_activeadmin.gemfile.lock
+++ b/gemfiles/rails80_activeadmin.gemfile.lock
@@ -121,6 +121,7 @@ GEM
       ferrum (~> 0.15.0)
     date (3.4.1)
     diff-lcs (1.6.0)
+    docile (1.4.1)
     drb (2.2.1)
     erubi (1.13.1)
     fasterer (0.11.0)
@@ -346,6 +347,12 @@ GEM
       ffi (~> 1.9)
     securerandom (0.4.1)
     sexp_processor (4.17.3)
+    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)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -411,6 +418,7 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   sassc
+  simplecov
   sprockets-rails
   sqlite3
 
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 6e5f09d..1968752 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -4,6 +4,9 @@
 
 ENV['RAILS_ENV'] = 'test'
 
+require 'simplecov'
+SimpleCov.start 'rails'
+
 require File.expand_path('dummy/config/environment.rb', __dir__)
 
 abort('The Rails environment is running in production mode!') if Rails.env.production?