```ruby
# frozen_string_literal: true

module Swagger
  module Docs
    module Generator
      # # Generate JSON file
      #
      # Create a json file for swagger-ui service
      #
      # @!attribute [r] swagger_file
      #   @return [String] the swagger file name with path
      class Generator
        attr_reader :swagger_file

        def initialize
          @file = 'swagger.json'
          @path = '/public'
          @swagger_file = File.join(Dir.pwd, @path, @file)
          @meta = Metadata.new
        end

        def generate_swagger_file
          delete_file_before
          swagger_file = File.new(@swagger_file, 'a+')
          swagger_file.puts(agregate_metadata)
          swagger_file.close
        end

        private

        attr_reader :meta

        def delete_file_before
          File.delete(@swagger_file) if File.exist?(@swagger_file)
        end

        def write_in_swagger_file
          hash = {}
          hash.merge!(@meta.version_swagger)
          hash.merge!(@meta.base_path)
        end

        def agregate_metadata
          case Rails.env
          when 'production' || 'test'
            write_inswagger_file.to_json
          else
            JSON.pretty_generate write_in_swagger_file
          end
        end
      end
    end
  end
end
```

Fix test Rails class exists
user
```ruby
# frozen_string_literal: true

module Swagger
  module Docs
    module Generator
      # # Generate JSON file
      #
      # Create a json file for swagger-ui service
      #
      # @!attribute [r] swagger_file
      #   @return [String] the swagger file name with path
      class Generator
        attr_reader :swagger_file

        def initialize
          @file = 'swagger.json'
          @path = '/public'
          @swagger_file = File.join(Dir.pwd, @path, @file)
          @meta = Metadata.new
        end

        def generate_swagger_file
          delete_file_before
          swagger_file = File.new(@swagger_file, 'a+')
          swagger_file.puts(agregate_metadata)
          swagger_file.close
        end

        private

        attr_reader :meta

        def delete_file_before
          File.delete(@swagger_file) if File.exist?(@swagger_file)
        end

        def write_in_swagger_file
          hash = {}
          hash.merge!(@meta.version_swagger)
          hash.merge!(@meta.base_path)
        end

        def agregate_metadata
          case defined?(Rails) && Rails.env
          when 'production' || 'test'
            write_inswagger_file.to_json
          else
            JSON.pretty_generate write_in_swagger_file
          end
        end
      end
    end
  end
end
```
assistant