diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c3a91f2..f4dfc48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,10 +6,6 @@ on:
   pull_request:
     branches: [ main ]
 
-env:
-  BUNDLE_WITHOUT: "development"
-  JRUBY_OPTS: "--dev --debug"
-
 jobs:
   test:
     name: "rspec (ruby:${{ matrix.ruby }})"
@@ -40,8 +36,37 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
 
-      - name: RSpec
-        run: scripts/ci-rspec
+      - run: bundle exec rake test
+
+      - name: "Upload coverage results"
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-${{ matrix.ruby }}
+          path: coverage/.resultset.json
+
+  test-coverage:
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby-3.2
+          bundler-cache: true
+
+      - name: "Download coverage results"
+        uses: actions/download-artifact@v3
+        with:
+          path: coverage
+
+      - run: bundle exec rake test:coverage
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   lint:
     runs-on: ubuntu-latest
@@ -54,5 +79,4 @@ jobs:
           ruby-version: ruby-3.2
           bundler-cache: true
 
-      - name: Rubocop
-        run: bundle exec rubocop --format progress --color
+      - run: bundle exec rake lint
diff --git a/.rspec b/.rspec
index c99d2e7..283edea 100644
--- a/.rspec
+++ b/.rspec
@@ -1 +1,2 @@
+--require simplecov
 --require spec_helper
diff --git a/.simplecov b/.simplecov
new file mode 100644
index 0000000..b80209d
--- /dev/null
+++ b/.simplecov
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+SimpleCov.start do
+  gemfile = File.basename(ENV.fetch("BUNDLE_GEMFILE", "Gemfile"), ".gemfile").strip
+  gemfile = nil if gemfile.empty? || gemfile.casecmp?("gems.rb") || gemfile.casecmp?("Gemfile")
+
+  command_name ["#{RUBY_ENGINE}-#{RUBY_ENGINE_VERSION}", gemfile].compact.join("/")
+
+  enable_coverage :branch
+
+  if ENV["CI"]
+    formatter SimpleCov::Formatter::SimpleFormatter
+  else
+    formatter SimpleCov::Formatter::MultiFormatter.new([
+      SimpleCov::Formatter::SimpleFormatter,
+      SimpleCov::Formatter::HTMLFormatter
+    ])
+  end
+
+  add_filter "/demo/"
+  add_filter "/gemfiles/"
+  add_filter "/spec/"
+  add_filter "/vendor/"
+end
diff --git a/Gemfile b/Gemfile
index 690275a..ad09f96 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,7 +16,9 @@ group :test do
 
   gem "rspec"
   gem "rspec-parameterized"
+
   gem "simplecov"
+  gem "simplecov-cobertura"
 
   gem "rubocop", require: false
   gem "rubocop-capybara", require: false
diff --git a/Rakefile b/Rakefile
index ba00716..c5191e6 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,9 +1,46 @@
 # frozen_string_literal: true
 
-require "appraisal"
 require "bundler/gem_tasks"
 
-require "rspec/core/rake_task"
-RSpec::Core::RakeTask.new
+desc "Run tests"
+task :test do
+  rm_rf "coverage"
+  rm_rf "gemfiles"
 
-task default: ENV["APPRAISAL_INITIALIZED"] ? %i[spec] : %i[appraisal rubocop]
+  Bundler.with_unbundled_env do
+    sh "bundle exec appraisal generate"
+
+    # XXX: `bundle exec appraisal install` fails on ruby-3.2
+    Dir["gemfiles/*.gemfile"].each do |gemfile|
+      sh({ "BUNDLE_GEMFILE" => gemfile }, "bundle lock")
+      sh({ "BUNDLE_GEMFILE" => gemfile }, "bundle check") do |ok|
+        sh({ "BUNDLE_GEMFILE" => gemfile }, "bundle install") unless ok
+      end
+    end
+
+    sh "bundle exec appraisal rspec --force-colour"
+  end
+end
+
+namespace :test do
+  desc "Generate test coverage report"
+  task :coverage do
+    require "simplecov"
+
+    SimpleCov.collate Dir["coverage/**/.resultset.json"] do
+      if ENV["CI"]
+        require "simplecov-cobertura"
+        formatter SimpleCov::Formatter::CoberturaFormatter
+      else
+        formatter SimpleCov::Formatter::HTMLFormatter
+      end
+    end
+  end
+end
+
+desc "Lint codebase"
+task :lint do
+  sh "bundle exec rubocop --color"
+end
+
+task default: %i[test lint]
diff --git a/rubocop/layout.yml b/rubocop/layout.yml
index 76bc629..6e5c7f1 100644
--- a/rubocop/layout.yml
+++ b/rubocop/layout.yml
@@ -1,6 +1,14 @@
+Layout/ArgumentAlignment:
+  Enabled: true
+  EnforcedStyle: with_fixed_indentation
+
 Layout/EmptyLinesAroundAttributeAccessor:
   Enabled: true
 
+Layout/FirstArrayElementIndentation:
+  Enabled: true
+  EnforcedStyle: consistent
+
 Layout/FirstHashElementIndentation:
   Enabled: true
   EnforcedStyle: consistent
diff --git a/rubocop/rspec.yml b/rubocop/rspec.yml
index c129a66..182e2e4 100644
--- a/rubocop/rspec.yml
+++ b/rubocop/rspec.yml
@@ -7,3 +7,7 @@ RSpec/MultipleExpectations:
 
 RSpec/NamedSubject:
   Enabled: false
+
+RSpec/BeNil:
+  Enabled: true
+  EnforcedStyle: be
diff --git a/rubocop/style.yml b/rubocop/style.yml
index 18f14c2..3a7e90f 100644
--- a/rubocop/style.yml
+++ b/rubocop/style.yml
@@ -67,7 +67,7 @@ Style/RegexpLiteral:
 
 Style/RescueStandardError:
   Enabled: true
-  EnforcedStyle: implicit
+  EnforcedStyle: explicit
 
 Style/SingleArgumentDig:
   Enabled: true
diff --git a/scripts/ci-rspec b/scripts/ci-rspec
deleted file mode 100755
index 1aedbca..0000000
--- a/scripts/ci-rspec
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-
-set -Eeuxo pipefail
-
-rm -f ./Gemfile.lock
-bundle install
-
-rm -f ./gemfiles/*.gemfile ./gemfiles/*.gemfile.lock
-bundle exec appraisal generate
-
-# XXX: `bundle exec appraisal install` fails on CI with ruby-3.2
-for BUNDLE_GEMFILE in gemfiles/*.gemfile; do
-  export BUNDLE_GEMFILE
-  bundle check || bundle install
-done
-
-bundle exec appraisal rspec
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a005712..4fc3cb1 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require_relative "support/simplecov" if ENV["CI"] || ENV["COVERAGE"]
 require_relative "support/sidekiq"
 
 require "rspec-parameterized"
diff --git a/spec/support/simplecov.rb b/spec/support/simplecov.rb
deleted file mode 100644
index ca4f6f6..0000000
--- a/spec/support/simplecov.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-require "simplecov"
-
-SimpleCov.start do
-  command_name "BUNDLE_GEMFILE=#{ENV.fetch('BUNDLE_GEMFILE')}"
-
-  enable_coverage :branch
-
-  add_filter "/gemfiles/"
-  add_filter "/spec/"
-  add_filter "/vendor/"
-end