diff --git a/Rakefile b/Rakefile
index d433a1e..4d87ca7 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,4 +7,16 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/*_test.rb"]
 end
 
-task :default => :test
+task :clear_coverage do
+  rm_rf "coverage"
+end
+
+task :coverage_report do
+  require "simplecov"
+  SimpleCov.collate Dir["coverage/.resultset.json"] do
+    coverage_dir "coverage"
+    enable_coverage :branch
+  end
+end
+
+task :default => [:clear_coverage, :test, :coverage_report]
diff --git a/bin/coverage b/bin/coverage
new file mode 100755
index 0000000..8544511
--- /dev/null
+++ b/bin/coverage
@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+
+require "simplecov"
+
+gem_src = ENV.fetch("COVERAGE_ROOT", File.expand_path("../..", __FILE__))
+
+SimpleCov.start do
+  root gem_src
+  coverage_dir ENV.fetch("COVERAGE_DIR", "coverage")
+  command_name ENV.fetch("COVERAGE_NAME", "acceptance")
+  enable_coverage :branch
+end
+
+$LOAD_PATH.unshift(File.join(gem_src, "lib"))
+
+exe = ARGV.shift
+exe_path = File.join(gem_src, "exe", exe)
+load exe_path
diff --git a/procsd.gemspec b/procsd.gemspec
index 69545b8..fe1cfe9 100644
--- a/procsd.gemspec
+++ b/procsd.gemspec
@@ -30,4 +30,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", ">= 1.16"
   spec.add_development_dependency "rake", ">= 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
+  spec.add_development_dependency "simplecov"
 end
diff --git a/test/acceptance/Dockerfile b/test/acceptance/Dockerfile
index 3761615..456196e 100644
--- a/test/acceptance/Dockerfile
+++ b/test/acceptance/Dockerfile
@@ -9,8 +9,6 @@ RUN apt-get update && apt-get install -y \
     systemd-sysv \
     dbus \
     ruby \
-    ruby-dev \
-    build-essential \
     sudo \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
@@ -29,7 +27,7 @@ RUN useradd -m -s /bin/bash testuser && \
     echo "testuser ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/testuser
 
 # Install gems needed by procsd
-RUN gem install thor dotenv --no-document
+RUN gem install thor dotenv simplecov --no-document
 
 # Create app directory
 RUN mkdir -p /home/testuser/myapp && chown testuser:testuser /home/testuser/myapp
diff --git a/test/acceptance/helper.rb b/test/acceptance/helper.rb
index 94ab610..613c68d 100644
--- a/test/acceptance/helper.rb
+++ b/test/acceptance/helper.rb
@@ -18,7 +18,9 @@ def teardown
   DOCKERFILE_PATH = File.expand_path("Dockerfile", __dir__)
   IMAGE_NAME = "procsd-test"
   GEM_ROOT = File.expand_path("../..", __dir__)
-  GEM_BUILD_DIR = "/tmp/procsd-test-gems"
+  COVERAGE_DIR = File.join(GEM_ROOT, "coverage")
+  CONTAINER_COVERAGE_DIR = "/tmp/coverage"
+  CONTAINER_GEM_SRC = "/gem-src"
 
   class Container
     attr_reader :id, :name
@@ -37,7 +39,7 @@ def start
         "--privileged",
         "--cgroupns=host",
         "-v", "/sys/fs/cgroup:/sys/fs/cgroup:rw",
-        "-v", "#{GEM_BUILD_DIR}:/gem:ro",
+        "-v", "#{GEM_ROOT}:#{CONTAINER_GEM_SRC}:ro",
         IMAGE_NAME
       ]
 
@@ -46,12 +48,13 @@ def start
 
       @id = output.strip
       wait_for_systemd
-      install_gem
+      setup_coverage
       self
     end
 
     def stop
       return unless @id
+      copy_coverage_results
       system("podman", "stop", "-t", "1", @name, out: File::NULL, err: File::NULL)
       system("podman", "rm", "-f", @name, out: File::NULL, err: File::NULL)
       @id = nil
@@ -101,8 +104,27 @@ def list_service_files(pattern)
 
     private
 
-    def install_gem
-      exec_as_root("gem install /gem/procsd-test.gem --local --ignore-dependencies --no-document")
+    def setup_coverage
+      exec_as_root("mkdir -p #{CONTAINER_COVERAGE_DIR}")
+      exec_as_root("chown testuser:testuser #{CONTAINER_COVERAGE_DIR}")
+    end
+
+    def copy_coverage_results
+      require "json"
+      temp_file = "/tmp/procsd-coverage-#{SecureRandom.hex(4)}.json"
+      system("podman", "cp", "#{@name}:#{CONTAINER_COVERAGE_DIR}/.resultset.json", temp_file, out: File::NULL, err: File::NULL)
+
+      container_data = JSON.parse(File.read(temp_file))
+      container_data.each do |_, result|
+        result["coverage"].transform_keys! { |path| path.sub(CONTAINER_GEM_SRC, GEM_ROOT) }
+      end
+
+      FileUtils.mkdir_p(COVERAGE_DIR)
+      resultset_path = File.join(COVERAGE_DIR, ".resultset.json")
+      existing_data = File.exist?(resultset_path) ? JSON.parse(File.read(resultset_path)) : {}
+      File.write(resultset_path, JSON.generate(existing_data.merge(container_data)))
+    ensure
+      FileUtils.rm_f(temp_file) if temp_file
     end
 
     def copy_content_to_container(path, content)
@@ -121,20 +143,11 @@ def image_exists?
     end
 
     def build_image
-      build_gem
       cmd = ["podman", "build", "-t", IMAGE_NAME, "-f", DOCKERFILE_PATH, File.dirname(DOCKERFILE_PATH)]
       output, status = Open3.capture2e(*cmd)
       raise "Failed to build image: #{output}" unless status.success?
     end
 
-    def build_gem
-      FileUtils.mkdir_p(GEM_BUILD_DIR)
-      gem_path = File.join(GEM_BUILD_DIR, "procsd-test.gem")
-      Dir.chdir(GEM_ROOT) do
-        system("gem", "build", "procsd.gemspec", "-o", gem_path, out: File::NULL, err: File::NULL)
-      end
-    end
-
     def wait_for_systemd(timeout: 30)
       start_time = Time.now
       loop do
@@ -191,6 +204,9 @@ def create_procfile(content)
   end
 
   def run_procsd(command)
-    container.exec("procsd #{command}")
+    container.exec(
+      "COVERAGE_ROOT=#{CONTAINER_GEM_SRC} COVERAGE_DIR=#{CONTAINER_COVERAGE_DIR} " \
+      "#{CONTAINER_GEM_SRC}/bin/coverage procsd #{command}"
+    )
   end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 42f1cd1..fd2cc90 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,12 @@
+require "simplecov"
+
+SimpleCov.start do
+  root File.expand_path("../..", __FILE__)
+  coverage_dir "coverage"
+  command_name "unit"
+  enable_coverage :branch
+end
+
 $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "procsd"