diff --git a/servant-ruby.cabal b/servant-ruby.cabal
index 83f58d6..781b9c4 100644
--- a/servant-ruby.cabal
+++ b/servant-ruby.cabal
@@ -27,12 +27,26 @@ library
 test-suite doc-test
   type:                exitcode-stdio-1.0
   main-is:             Main.hs
-  hs-source-dirs:      test
+  hs-source-dirs:      test/doc
   build-depends:       base
                      , doctest >= 0.11
                      , QuickCheck >= 2.9
   default-language:    Haskell2010
 
+test-suite golden-test
+  type:                exitcode-stdio-1.0
+  main-is:             Main.hs
+  hs-source-dirs:      test/golden
+  build-depends:       base
+                     , bytestring >= 0.10.8.2
+                     , servant >= 0.9 && < 0.16
+                     , servant-foreign >= 0.9 && < 0.16
+                     , servant-ruby
+                     , tasty >= 0.11.3
+                     , tasty-golden >= 2.3.1.1
+                     , text >= 1.2 && < 1.3
+  default-language:    Haskell2010
+
 source-repository head
   type:     git
   location: https://github.com/joneshf/servant-ruby
diff --git a/src/Servant/Ruby.hs b/src/Servant/Ruby.hs
index 6174255..ec85b09 100644
--- a/src/Servant/Ruby.hs
+++ b/src/Servant/Ruby.hs
@@ -383,7 +383,7 @@ paramToStr :: QueryArg f -> Text
 paramToStr qarg =
   case qarg ^. queryArgType of
     Normal -> key <> "=#{" <> val <> "}"
-    Flag   -> key
+    Flag   -> "#{" <> key <> " ? '" <> key <> "' : ''}"
     List   -> "#{ " <> val <> ".collect { |x| '" <> key <> "[]=' + x.to_s }.join('&') }"
   where
   key = qarg ^. queryArgName.argName._PathSegment
diff --git a/test/Main.hs b/test/doc/Main.hs
similarity index 100%
rename from test/Main.hs
rename to test/doc/Main.hs
diff --git a/test/golden/Main.hs b/test/golden/Main.hs
new file mode 100644
index 0000000..53fe35a
--- /dev/null
+++ b/test/golden/Main.hs
@@ -0,0 +1,48 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TypeOperators #-}
+
+module Main where
+
+import Data.ByteString.Lazy (ByteString)
+import Data.Proxy (Proxy(Proxy))
+import Test.Tasty (defaultMain, testGroup)
+import Test.Tasty.Golden (goldenVsString)
+import Servant.API ((:>), Get, Post, JSON, Capture, Header, ReqBody, QueryParam, QueryParams, QueryFlag)
+import Servant.Ruby (ruby, NameSpace(NameSpace))
+import Data.Text.Lazy.Encoding (encodeUtf8)
+import Data.Text.Lazy (fromStrict)
+import Servant.Foreign (GenerateList, NoContent, Foreign, HasForeign, NoTypes)
+
+main :: IO ()
+main = defaultMain $ testGroup "golden tests"
+  [ goldenVsString "static" "test/golden/expected/static.rb" (test (Proxy :: Proxy StaticApi))
+  , goldenVsString "parameters" "test/golden/expected/parameters.rb" (test (Proxy :: Proxy ParametersApi))
+  , goldenVsString "body" "test/golden/expected/body.rb" (test (Proxy :: Proxy BodyApi))
+  , goldenVsString "header" "test/golden/expected/header.rb" (test (Proxy :: Proxy HeaderApi))
+  , goldenVsString "query param" "test/golden/expected/query_param.rb" (test (Proxy :: Proxy QueryParamApi))
+  , goldenVsString "query params" "test/golden/expected/query_params.rb" (test (Proxy :: Proxy QueryParamsApi))
+  , goldenVsString "query flag" "test/golden/expected/query_flag.rb" (test (Proxy :: Proxy QueryFlagApi))
+  ]
+
+
+type StaticApi = "hello" :> "world" :> Get '[JSON] ()
+
+type ParametersApi = Capture "butterfly" () :> Get '[JSON] ()
+
+type BodyApi = ReqBody '[JSON] () :> Post '[JSON] ()
+
+type HeaderApi = Header "moth" () :> Post '[JSON] ()
+
+type QueryParamApi = QueryParam "spider" () :> Get '[JSON] ()
+
+type QueryParamsApi = QueryParams "spiders" () :> Get '[JSON] ()
+
+type QueryFlagApi = QueryFlag "beetle" :> Get '[JSON] ()
+
+test
+  :: (GenerateList NoContent (Foreign NoContent api), HasForeign NoTypes NoContent api)
+  => Proxy api
+  -> IO ByteString
+test = pure . encodeUtf8 . fromStrict . ruby (NameSpace ["Generated", "V1"] "Things")
diff --git a/test/golden/expected/body.rb b/test/golden/expected/body.rb
new file mode 100644
index 0000000..883f0c5
--- /dev/null
+++ b/test/golden/expected/body.rb
@@ -0,0 +1,31 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def post_uri()
+        URI("#{@origin}")
+      end
+
+      def post(body:)
+        req = Net::HTTP::Post.new(post_uri())
+        req["Content-Type"] = "application/json"
+
+        @http.request(req, body)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/header.rb b/test/golden/expected/header.rb
new file mode 100644
index 0000000..9885e43
--- /dev/null
+++ b/test/golden/expected/header.rb
@@ -0,0 +1,31 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def post_uri()
+        URI("#{@origin}")
+      end
+
+      def post(moth:)
+        req = Net::HTTP::Post.new(post_uri())
+        req["moth"] = moth
+
+        @http.request(req)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/parameters.rb b/test/golden/expected/parameters.rb
new file mode 100644
index 0000000..f586457
--- /dev/null
+++ b/test/golden/expected/parameters.rb
@@ -0,0 +1,34 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def get_by_butterfly_uri(butterfly)
+        butterfly = if butterfly.kind_of?(Array) then butterfly.join(',') else butterfly end
+
+        URI("#{@origin}/#{butterfly}")
+      end
+
+      def get_by_butterfly(butterfly)
+        butterfly = if butterfly.kind_of?(Array) then butterfly.join(',') else butterfly end
+
+        req = Net::HTTP::Get.new(get_by_butterfly_uri(butterfly))
+
+        @http.request(req)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/query_flag.rb b/test/golden/expected/query_flag.rb
new file mode 100644
index 0000000..da39b9b
--- /dev/null
+++ b/test/golden/expected/query_flag.rb
@@ -0,0 +1,30 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def get_uri(beetle)
+        URI("#{@origin}?#{beetle ? 'beetle' : ''}")
+      end
+
+      def get(beetle)
+        req = Net::HTTP::Get.new(get_uri(beetle))
+
+        @http.request(req)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/query_param.rb b/test/golden/expected/query_param.rb
new file mode 100644
index 0000000..39524cf
--- /dev/null
+++ b/test/golden/expected/query_param.rb
@@ -0,0 +1,30 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def get_uri(spider)
+        URI("#{@origin}?spider=#{spider}")
+      end
+
+      def get(spider)
+        req = Net::HTTP::Get.new(get_uri(spider))
+
+        @http.request(req)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/query_params.rb b/test/golden/expected/query_params.rb
new file mode 100644
index 0000000..6e1d8d5
--- /dev/null
+++ b/test/golden/expected/query_params.rb
@@ -0,0 +1,30 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def get_uri(spiders)
+        URI("#{@origin}?#{ spiders.collect { |x| 'spiders[]=' + x.to_s }.join('&') }")
+      end
+
+      def get(spiders)
+        req = Net::HTTP::Get.new(get_uri(spiders))
+
+        @http.request(req)
+      end
+    end
+  end
+end
diff --git a/test/golden/expected/static.rb b/test/golden/expected/static.rb
new file mode 100644
index 0000000..02f4f0f
--- /dev/null
+++ b/test/golden/expected/static.rb
@@ -0,0 +1,30 @@
+require "json"
+require "net/http"
+require "uri"
+
+module Generated
+  module V1
+    class Things
+      def initialize(origin, timeout = nil)
+        @origin = URI(origin)
+        @http = Net::HTTP.new(@origin.host, @origin.port)
+
+        unless timeout.nil?
+          @http.open_timeout = timeout
+          @http.read_timeout = timeout
+        end
+        @http.use_ssl = @origin.scheme == 'https'
+      end
+
+      def get_hello_world_uri()
+        URI("#{@origin}/hello/world")
+      end
+
+      def get_hello_world()
+        req = Net::HTTP::Get.new(get_hello_world_uri())
+
+        @http.request(req)
+      end
+    end
+  end
+end