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diff --git a/src/VeriFuzz/Internal/AST.hs b/src/VeriFuzz/Internal/AST.hs
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+{-|
+Module      : VeriFuzz.Internal.AST
+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 VeriFuzz.Internal.AST where
+
+import           Control.Lens
+import           Data.Text    (Text)
+import           VeriFuzz.AST
+
+regDecl :: Identifier -> ModItem
+regDecl = Decl Nothing . Port (Reg False) 1
+
+wireDecl :: Identifier -> ModItem
+wireDecl = Decl Nothing . Port Wire 1
+
+-- | Create an empty module.
+emptyMod :: ModDecl
+emptyMod = ModDecl "" [] [] []
+
+-- | Set a module name for a module declaration.
+setModName :: Text -> ModDecl -> ModDecl
+setModName str = modId .~ 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"
+  []
+  []
+  [ regDecl "a"
+  , regDecl "b"
+  , wireDecl "c"
+  , ModInst "and" "and_gate" [ModConn $ Id "c", ModConn $ Id "a", ModConn $ Id "b"]
+  , Initial $ SeqBlock
+    [ BlockAssign . Assign (RegId "a") Nothing $ Number 1 1
+    , BlockAssign . Assign (RegId "b") Nothing $ Number 1 1
+    -- , TimeCtrl (Delay 1) . Just . SysTaskEnable $ Task "display"
+    --   [ Str "%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 Wire 1
+
+portToExpr :: Port -> Expr
+portToExpr (Port _ _ i) = Id i
+
+modName :: ModDecl -> Text
+modName = view $ modId . getIdentifier