Spec: move helper function into spec scope

It's better practice to declare helper methods that are dedicated to a specific `describe` or `context` scope inside said scope, instead of declaring the helper functions at the global namespace, otherwise that helper could accidentally shadow another helper of the same name for another spec doing the same.

Author: AliSoftware

spec/ios_lint_localizations_spec.rb

@@ -54,6 +54,34 @@
   end
 
   context 'Linter' do
+    def run_l10n_linter_test(data_file)
+      # Arrange: Prepare test files
+      test_file = File.join(File.dirname(__FILE__), 'test-data', 'translations', "test-lint-ios-#{data_file}.yaml")
+      yml = YAML.load_file(test_file)
+
+      files = yml['test_data']
+      FileUtils.mkdir_p(@test_data_dir)
+      files.each do |lang, content|
+        lproj = File.join(@test_data_dir, "#{lang}.lproj")
+        FileUtils.mkdir_p(lproj)
+        File.write(File.join(lproj, 'Localizable.strings'), content) unless content.nil?
+      end
+
+      # Act
+      # Note: We will install SwiftGen in vendor/swiftgen if it's not already installed yet, and intentionally won't
+      #       remove this after the test ends, so that further executions of the test run faster.
+      #       Only the first execution of the tests might take longer if it needs to install SwiftGen first to be able to run the tests.
+      install_dir = "vendor/swiftgen/#{Fastlane::Helper::Ios::L10nLinterHelper::SWIFTGEN_VERSION}"
+      result = run_described_fastlane_action(
+        install_path: install_dir,
+        input_dir: @test_data_dir,
+        base_lang: 'en'
+      )
+
+      # Assert
+      expect(result).to eq(yml['result'])
+    end
+
     before(:each) do
       @test_data_dir = Dir.mktmpdir('a8c-lint-l10n-tests-data-')
       allow(FastlaneCore::UI).to receive(:abort_with_message!)
@@ -84,31 +112,3 @@
     end
   end
 end
-
-def run_l10n_linter_test(data_file)
-  # Arrange: Prepare test files
-  test_file = File.join(File.dirname(__FILE__), 'test-data', 'translations', "test-lint-ios-#{data_file}.yaml")
-  yml = YAML.load_file(test_file)
-
-  files = yml['test_data']
-  FileUtils.mkdir_p(@test_data_dir)
-  files.each do |lang, content|
-    lproj = File.join(@test_data_dir, "#{lang}.lproj")
-    FileUtils.mkdir_p(lproj)
-    File.write(File.join(lproj, 'Localizable.strings'), content) unless content.nil?
-  end
-
-  # Act
-  # Note: We will install SwiftGen in vendor/swiftgen if it's not already installed yet, and intentionally won't
-  #       remove this after the test ends, so that further executions of the test run faster.
-  #       Only the first execution of the tests might take longer if it needs to install SwiftGen first to be able to run the tests.
-  install_dir = "vendor/swiftgen/#{Fastlane::Helper::Ios::L10nLinterHelper::SWIFTGEN_VERSION}"
-  result = run_described_fastlane_action(
-    install_path: install_dir,
-    input_dir: @test_data_dir,
-    base_lang: 'en'
-  )
-
-  # Assert
-  expect(result).to eq(yml['result'])
-end