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diff --git a/src/Test/VeriFuzz/Verilog/Helpers.hs b/src/Test/VeriFuzz/Verilog/Helpers.hs
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+{-|
+Module      : Test.VeriFuzz.VeriFuzz.Helpers
+Description : Defaults and common functions.
+Copyright   : (c) 2018-2019, Yann Herklotz Grave
+License     : BSD-3
+Maintainer  : ymherklotz [at] gmail [dot] com
+Stability   : experimental
+Portability : POSIX
+
+Defaults and common functions.
+-}
+
+module Test.VeriFuzz.VeriFuzz.Helpers where
+
+import           Control.Lens
+import           Data.Text                 (Text)
+import qualified Data.Text
+import           Test.VeriFuzz.Verilog.AST
+
+regDecl :: Text -> ModItem
+regDecl = Decl . Port (Reg False) . Identifier
+
+wireDecl :: Text -> ModItem
+wireDecl = Decl . Port (PortNet Wire) . Identifier
+
+modConn :: Text -> ModConn
+modConn = ModConn . PrimExpr . PrimId . Identifier
+
+-- | Create a number expression which will be stored in a primary expression.
+numExpr :: Int -> Int -> Expression
+numExpr = ((PrimExpr . PrimNum) .) . Number
+
+-- | Create an empty module.
+emptyMod :: ModDecl
+emptyMod = ModDecl "" Nothing [] []
+
+-- | Set a module name for a module declaration.
+setModName :: Text -> ModDecl -> ModDecl
+setModName str = moduleId .~ Identifier str
+
+-- | Add a input port to the module declaration.
+addModPort :: Port -> ModDecl -> ModDecl
+addModPort port = modInPorts %~ (:) port
+
+addDescription :: Description -> VerilogSrc -> VerilogSrc
+addDescription desc = getVerilogSrc %~ (:) desc
+
+testBench :: ModDecl
+testBench =
+  ModDecl "main" Nothing []
+  [ regDecl "a"
+  , regDecl "b"
+  , wireDecl "c"
+  , ModInst "and" "and_gate"
+    [ modConn "c"
+    , modConn "a"
+    , modConn "b"
+    ]
+  , Initial $ SeqBlock
+    [ BlockAssign . Assign (RegId "a") Nothing . PrimExpr . PrimNum $ Number 1 1
+    , BlockAssign . Assign (RegId "b") Nothing . PrimExpr . PrimNum $ Number 1 1
+    -- , TimeCtrl (Delay 1) . Just . SysTaskEnable $ Task "display"
+    --   [ ExprStr "%d & %d = %d"
+    --   , PrimExpr $ PrimId "a"
+    --   , PrimExpr $ PrimId "b"
+    --   , PrimExpr $ PrimId "c"
+    --   ]
+    -- , SysTaskEnable $ Task "finish" []
+    ]
+  ]
+
+addTestBench :: VerilogSrc -> VerilogSrc
+addTestBench = addDescription $ Description testBench
+
+defaultPort :: Identifier -> Port
+defaultPort = Port (PortNet Wire) 1