diff --git a/test/features/credentials_test.rb b/test/features/credentials_test.rb
index d25435d..3ac9291 100644
--- a/test/features/credentials_test.rb
+++ b/test/features/credentials_test.rb
@@ -1,137 +1,144 @@
 require_relative "../test_helper"
 require_relative "runner_helper"
+require_relative "file_helper"
 
 module Rails::AppEnv::FeaturesTest
   class CredentialsTest < ActiveSupport::TestCase
     include RunnerHelper
+    include FileHelper
 
-    CREDENTIALS_PATH_TEST_CASES = [
-      {
-        name: "is {APP_ENV}.yml.enc when both APP_ENV and RAILS_ENV are present",
+    CREDENTIALS_PATH_TEST_CASES = {
+      "is {APP_ENV}.yml.enc when both APP_ENV and RAILS_ENV are present": {
         expected_path: "config/credentials/foo.yml.enc",
-        app_env: "foo",
-        rails_env: "bar",
-        secret_key_base_dummy: "1",
-        touch_file: "config/credentials/foo.yml.enc"
+        touch_file: "config/credentials/foo.yml.enc",
+        env: {
+          "APP_ENV" => "foo",
+          "RAILS_ENV" => "bar"
+        }
       },
-      {
-        name: "falls back to credentials.yml.enc when {APP_ENV}.yml.enc is absent and both APP_ENV and RAILS_ENV are present",
+      "falls back to credentials.yml.enc when {APP_ENV}.yml.enc is absent and both APP_ENV and RAILS_ENV are present": {
         expected_path: "config/credentials.yml.enc",
-        app_env: "foo",
-        rails_env: "bar",
-        secret_key_base_dummy: "1"
+        env: {
+          "APP_ENV" => "foo",
+          "RAILS_ENV" => "bar"
+        }
       },
-      {
-        name: "is {APP_ENV}.yml.enc when APP_ENV is present but RAILS_ENV is blank",
+      "is {APP_ENV}.yml.enc when APP_ENV is present but RAILS_ENV is blank": {
         expected_path: "config/credentials/foo.yml.enc",
-        app_env: "foo",
-        touch_file: "config/credentials/foo.yml.enc"
+        touch_file: "config/credentials/foo.yml.enc",
+        env: {
+          "APP_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to credentials.yml.enc when {APP_ENV}.yml.enc is absent and APP_ENV is present but RAILS_ENV is blank",
+      "falls back to credentials.yml.enc when {APP_ENV}.yml.enc is absent and APP_ENV is present but RAILS_ENV is blank": {
         expected_path: "config/credentials.yml.enc",
-        app_env: "foo",
-        secret_key_base_dummy: "1"
+        env: {
+          "APP_ENV" => "foo"
+        }
       },
-      {
-        name: "is {RAILS_ENV}.yml.enc when APP_ENV is blank but RAILS_ENV is present",
+      "is {RAILS_ENV}.yml.enc when APP_ENV is blank but RAILS_ENV is present": {
         expected_path: "config/credentials/foo.yml.enc",
-        rails_env: "foo",
-        secret_key_base_dummy: "1",
-        touch_file: "config/credentials/foo.yml.enc"
+        touch_file: "config/credentials/foo.yml.enc",
+        env: {
+          "RAILS_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to credentials.yml.enc when {RAILS_ENV}.yml.enc is absent and when APP_ENV is blank but RAILS_ENV is present",
+      "falls back to credentials.yml.enc when {RAILS_ENV}.yml.enc is absent and when APP_ENV is blank but RAILS_ENV is present": {
         expected_path: "config/credentials.yml.enc",
-        rails_env: "foo",
-        secret_key_base_dummy: "1"
+        env: {
+          "RAILS_ENV" => "foo"
+        }
       },
-      {
-        name: "is {DEFAULT_RAILS_ENV}.yml.enc when both APP_ENV and RAILS_ENV are blank",
+      "is {DEFAULT_RAILS_ENV}.yml.enc when both APP_ENV and RAILS_ENV are blank": {
         expected_path: "config/credentials/#{DEFAULT_RAILS_ENV}.yml.enc",
         touch_file: "config/credentials/#{DEFAULT_RAILS_ENV}.yml.enc"
       },
-      {
-        name: "falls back to credentials.yml.enc when {DEFAULT_RAILS_ENV}.yml.enc is absent and both APP_ENV and RAILS_ENV are blank",
+      "falls back to credentials.yml.enc when {DEFAULT_RAILS_ENV}.yml.enc is absent and both APP_ENV and RAILS_ENV are blank": {
         expected_path: "config/credentials.yml.enc"
       }
-    ]
+    }
 
-    KEY_PATH_TEST_CASES = [
-      {
-        name: "is {APP_ENV}.key when both APP_ENV and RAILS_ENV are present",
+    KEY_PATH_TEST_CASES = {
+      "is {APP_ENV}.key when both APP_ENV and RAILS_ENV are present": {
         expected_path: "config/credentials/foo.key",
-        app_env: "foo",
-        rails_env: "bar",
-        secret_key_base_dummy: "1",
-        touch_file: "config/credentials/foo.key"
+        touch_file: "config/credentials/foo.key",
+        env: {
+          "APP_ENV" => "foo",
+          "RAILS_ENV" => "bar"
+        }
       },
-      {
-        name: "falls back to master.key when {APP_ENV}.key is absent and both APP_ENV and RAILS_ENV are present",
+      "falls back to master.key when {APP_ENV}.key is absent and both APP_ENV and RAILS_ENV are present": {
         expected_path: "config/master.key",
-        app_env: "foo",
-        rails_env: "bar",
-        secret_key_base_dummy: "1"
+        env: {
+          "APP_ENV" => "foo",
+          "RAILS_ENV" => "bar"
+        }
       },
-      {
-        name: "is {APP_ENV}.key when APP_ENV is present but RAILS_ENV is blank",
+      "is {APP_ENV}.key when APP_ENV is present but RAILS_ENV is blank": {
         expected_path: "config/credentials/foo.key",
-        app_env: "foo",
-        touch_file: "config/credentials/foo.key"
+        touch_file: "config/credentials/foo.key",
+        env: {
+          "APP_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to master.key when {APP_ENV}.key is absent and APP_ENV is present but RAILS_ENV is blank",
+      "falls back to master.key when {APP_ENV}.key is absent and APP_ENV is present but RAILS_ENV is blank": {
         expected_path: "config/master.key",
-        app_env: "foo"
+        env: {
+          "APP_ENV" => "foo"
+        }
       },
-      {
-        name: "is {RAILS_ENV}.key when APP_ENV is blank but RAILS_ENV is present",
+      "is {RAILS_ENV}.key when APP_ENV is blank but RAILS_ENV is present": {
         expected_path: "config/credentials/foo.key",
-        rails_env: "foo",
         touch_file: "config/credentials/foo.key",
-        secret_key_base_dummy: "1"
+        env: {
+          "RAILS_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to master.key when {RAILS_ENV}.key is absent and when APP_ENV is blank but RAILS_ENV is present",
+      "falls back to master.key when {RAILS_ENV}.key is absent and when APP_ENV is blank but RAILS_ENV is present": {
         expected_path: "config/master.key",
-        rails_env: "foo",
-        secret_key_base_dummy: "1"
+        env: {
+          "RAILS_ENV" => "foo"
+        }
       },
-      {
-        name: "is {DEFAULT_RAILS_ENV}.key when both APP_ENV and RAILS_ENV are blank",
+      "is {DEFAULT_RAILS_ENV}.key when both APP_ENV and RAILS_ENV are blank": {
         expected_path: "config/credentials/#{DEFAULT_RAILS_ENV}.key",
         touch_file: "config/credentials/#{DEFAULT_RAILS_ENV}.key"
       },
-      {
-        name: "falls back to master.key when {DEFAULT_RAILS_ENV}.key is absent and both APP_ENV and RAILS_ENV are blank",
+      "falls back to master.key when {DEFAULT_RAILS_ENV}.key is absent and both APP_ENV and RAILS_ENV are blank": {
         expected_path: "config/master.key"
       }
-    ]
+    }
 
-    CREDENTIALS_PATH_TEST_CASES.each_with_index do |args, i|
+    CREDENTIALS_PATH_TEST_CASES.each_key do |name|
       class_eval <<~RUBY, __FILE__, __LINE__ + 1
-        test "content path #{args[:name]}" do
-          assert_credentials_path(**CREDENTIALS_PATH_TEST_CASES[#{i}])
+        test "content path  #{name}" do
+          assert_credentials_path(**CREDENTIALS_PATH_TEST_CASES[:"#{name}"])
         end
       RUBY
     end
 
-    KEY_PATH_TEST_CASES.each_with_index do |args, i|
+    KEY_PATH_TEST_CASES.each_key do |name|
       class_eval <<~RUBY, __FILE__, __LINE__ + 1
-        test "key path #{args[:name]}" do
-          assert_key_path(**KEY_PATH_TEST_CASES[#{i}])
+        test "key path  #{name}" do
+          assert_key_path(**KEY_PATH_TEST_CASES[:"#{name}"])
         end
       RUBY
     end
 
     private
 
-    def assert_credentials_path(expected_path:, **options)
-      assert_runner Rails.root.join(expected_path), "Rails.configuration.credentials.content_path", **options
+    def assert_credentials_path(expected_path:, touch_file: nil, **options)
+      assert_runner_puts_with_file Rails.root.join(expected_path), "Rails.configuration.credentials.content_path", touch_file, **options
+    end
+
+    def assert_key_path(expected_path:, touch_file: nil, **options)
+      assert_runner_puts_with_file Rails.root.join(expected_path), "Rails.configuration.credentials.key_path", touch_file, **options
     end
 
-    def assert_key_path(expected_path:, **options)
-      assert_runner Rails.root.join(expected_path), "Rails.configuration.credentials.key_path", **options
+    def assert_runner_puts_with_file(expected, subject, file_path, **options)
+      with_file(file_path) do
+        assert_runner_puts expected, subject, **options
+      end
     end
   end
 end
diff --git a/test/features/file_helper.rb b/test/features/file_helper.rb
new file mode 100644
index 0000000..e3de1cf
--- /dev/null
+++ b/test/features/file_helper.rb
@@ -0,0 +1,16 @@
+module FileHelper
+  private
+
+  def with_file(path, &block)
+    return block.call nil if path.nil?
+
+    full_path = Rails.root.join path
+
+    FileUtils.mkdir_p File.dirname(full_path)
+    FileUtils.touch full_path
+
+    block.call full_path
+  ensure
+    FileUtils.rm_f full_path unless full_path.nil?
+  end
+end
diff --git a/test/features/info_test.rb b/test/features/info_test.rb
index 8588cb1..1107269 100644
--- a/test/features/info_test.rb
+++ b/test/features/info_test.rb
@@ -5,37 +5,43 @@ module Rails::AppEnv::FeaturesTest
   class InfoTest < ActiveSupport::TestCase
     include RunnerHelper
 
-    TEST_CASES = [
-      {
-        name: "is APP_ENV when both APP_ENV and RAILS_ENV are present",
+    TEST_CASES = {
+      "is APP_ENV when both APP_ENV and RAILS_ENV are present": {
         expected: "foo",
-        app_env: "foo",
-        rails_env: "bar",
-        secret_key_base_dummy: "1"
+        env: {
+          "APP_ENV" => "foo",
+          "RAILS_ENV" => "bar"
+        }
       },
-      {
-        name: "is APP_ENV when APP_ENV is present but RAILS_ENV is blank",
+      "is APP_ENV when APP_ENV is present but RAILS_ENV is blank": {
         expected: "foo",
-        app_env: "foo"
+        env: {
+          "APP_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to RAILS_ENV when APP_ENV is blank but RAILS_ENV is present",
+      "falls back to RAILS_ENV when APP_ENV is blank but RAILS_ENV is present": {
         expected: "foo",
-        rails_env: "foo",
-        secret_key_base_dummy: "1"
+        env: {
+          "RAILS_ENV" => "foo"
+        }
       },
-      {
-        name: "falls back to DEFAULT_RAILS_ENV when both APP_ENV and RAILS_ENV are blank",
+      "falls back to DEFAULT_RAILS_ENV when both APP_ENV and RAILS_ENV are blank": {
         expected: DEFAULT_RAILS_ENV # development
       }
-    ]
+    }
 
-    TEST_CASES.each_with_index do |args, i|
+    TEST_CASES.each_key do |name|
       class_eval <<~RUBY, __FILE__, __LINE__ + 1
-        test "Rails::Info's 'Application environment' #{args[:name]}" do
-          assert_runner args[:expected], 'Rails::Info.properties.value_for("Application environment")', **args
+        test "Rails::Info's 'Application environment' #{name}" do
+          assert_rails_info_property(**TEST_CASES[:"#{name}"])
         end
       RUBY
     end
+
+    private
+
+    def assert_rails_info_property(expected:, **options)
+      assert_runner_puts expected, 'Rails::Info.properties.value_for("Application environment")', **options
+    end
   end
 end
diff --git a/test/features/runner_helper.rb b/test/features/runner_helper.rb
index 085e7a3..6425168 100644
--- a/test/features/runner_helper.rb
+++ b/test/features/runner_helper.rb
@@ -7,31 +7,12 @@ module RunnerHelper
 
   DUMMY_RAILS = File.expand_path "../../dummy/bin/rails", __FILE__
 
-  def assert_runner(expected, subject, app_env: nil, rails_env: nil, secret_key_base_dummy: nil, touch_file: nil, **options)
-    switch_env "APP_ENV", app_env do
-      with_rails_env(rails_env) do
-        switch_env "SECRET_KEY_BASE_DUMMY", secret_key_base_dummy do
-          with_file(touch_file) do
-            stdout, status = Open3.capture2(DUMMY_RAILS, "runner", "puts #{subject}")
+  def assert_runner_puts(expected, subject, env: {})
+    env = env.with_defaults({"APP_ENV" => nil, "RAILS_ENV" => nil, "SECRET_KEY_BASE_DUMMY" => "1"})
 
-            assert_predicate status, :success?
-            assert_equal expected.to_s, stdout.chomp
-          end
-        end
-      end
-    end
-  end
-
-  def with_file(path, &block)
-    return block.call nil if path.nil?
-
-    full_path = Rails.root.join path
-
-    FileUtils.mkdir_p File.dirname(full_path)
-    FileUtils.touch full_path
+    stdout, status = Open3.capture2(env, DUMMY_RAILS, "runner", "puts #{subject}")
 
-    block.call full_path
-  ensure
-    FileUtils.rm_f full_path unless full_path.nil?
+    assert_predicate status, :success?
+    assert_equal expected.to_s, stdout.chomp
   end
 end