diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,4 @@
+import Distribution.Simple
+
+main :: IO ()
+main = defaultMain
diff --git a/Test/Chuchu.hs b/Test/Chuchu.hs
new file mode 100644
--- /dev/null
+++ b/Test/Chuchu.hs
@@ -0,0 +1,186 @@
+-- |
+-- Module      :  Test.Chuchu
+-- Copyright   :  (c) Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com> 2012
+-- License     :  Apache 2.0 (see the file LICENSE)
+--
+-- Maintainer  :  Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+-- Stability   :  unstable
+-- Portability :  non-portable (DeriveDataTypeable)
+--
+-- Chuchu is a system similar to Ruby's Cucumber for Behaviour Driven
+-- Development.  It works with a language similar to Cucumber's Gherkin, which
+-- is parsed using package abacate.
+--
+-- This module provides the main function for a test file based on Behaviour
+-- Driven Development for Haskell.
+--
+-- Example for a Stack calculator:
+--
+-- @calculator.feature@:
+--
+-- @
+--Feature: Division
+--  In order to avoid silly mistakes
+--  Cashiers must be able to calculate a fraction
+--
+--  Scenario: Regular numbers
+--    Given that I have entered 3 into the calculator
+--    And that I have entered 2 into the calculator
+--    When I press divide
+--    Then the result should be 1.5 on the screen
+-- @
+--
+-- @calculator.hs@:
+--
+-- @
+--import Control.Applicative
+--import Control.Monad.IO.Class
+--import Control.Monad.Trans.State
+--import Test.Chuchu
+--import Test.HUnit
+--
+--type CalculatorT m = StateT \[Double\] m
+--
+--enterNumber :: Monad m => Double -> CalculatorT m ()
+--enterNumber = modify . (:)
+--
+--getDisplay :: Monad m => CalculatorT m Double
+--getDisplay
+--  = do
+--    ns <- get
+--    return $ head $ ns ++ [0]
+--
+--divide :: Monad m => CalculatorT m ()
+--divide = do
+--  (n1:n2:ns) <- get
+--  put $ (n2 / n1) : ns
+--
+--defs :: Chuchu (CalculatorT IO)
+--defs
+--  = do
+--    Given
+--      ("that I have entered " *> number <* " into the calculator")
+--      enterNumber
+--    When "I press divide" $ const divide
+--    Then ("the result should be " *> number <* " on the screen")
+--      $ \\n
+--        -> do
+--          d <- getDisplay
+--          liftIO $ d \@?= n
+--
+--main :: IO ()
+--main = chuchuMain defs (\`evalStateT\` [])
+-- @
+
+module
+  Test.Chuchu
+  (chuchuMain, module Test.Chuchu.Types, module Test.Chuchu.Parser)
+  where
+
+-- base
+import Control.Applicative
+import Control.Monad
+import System.Environment
+import System.Exit
+import System.IO
+
+-- transformers
+import Control.Monad.IO.Class
+import Control.Monad.Trans.Class
+import Control.Monad.Trans.Reader
+
+-- parsec
+import Text.Parsec
+import Text.Parsec.Text
+
+-- cmdargs
+import System.Console.CmdArgs
+
+-- abacate
+import Language.Abacate hiding (StepKeyword (..))
+
+-- chuchu
+import Test.Chuchu.Types
+import Test.Chuchu.Parser
+
+-- | The main function for the test file.  It expects the @.feature@ file as the
+-- first parameter on the command line.  If you want to use it inside a library,
+-- consider using 'withArgs'.
+chuchuMain :: MonadIO m => Chuchu m -> (m () -> IO ()) -> IO ()
+chuchuMain cc runMIO
+  = do
+    path <- getPath
+    parsed <- parseFile path
+    case parsed of
+      (Right abacate)
+        -> runMIO
+          $ runReaderT
+            (do
+              code <- processAbacate abacate
+              unless code $ liftIO exitFailure)
+          $ runChuchu cc
+      (Left e) -> error $ "Could not parse " ++ path ++ ": " ++ show e
+
+type CM m a = ReaderT (Parser (m ())) m a
+
+processAbacate :: MonadIO m => Abacate -> CM m Bool
+processAbacate feature
+  = do
+    bCode
+      <- case fBackground feature of
+        Nothing -> return True
+        Just background -> processBasicScenario background
+    feCode <- processFeatureElements $ fFeatureElements feature
+    return $ bCode && feCode
+
+processFeatureElements :: MonadIO m => FeatureElements -> CM m Bool
+processFeatureElements featureElements
+  = do
+    codes <- mapM processFeatureElement featureElements
+    return $ and codes
+
+processFeatureElement :: MonadIO m => FeatureElement -> CM m Bool
+processFeatureElement (FESO _)
+  = liftIO (hPutStrLn stderr "Scenario Outlines are not supported yet.")
+    >> return False
+processFeatureElement (FES sc) = processBasicScenario $ scBasicScenario sc
+
+processBasicScenario :: MonadIO m => BasicScenario -> CM m Bool
+processBasicScenario = processSteps . bsSteps
+
+processSteps :: MonadIO m => Steps -> CM m Bool
+processSteps steps
+  = do
+    codes <- mapM processStep steps
+    return $ and codes
+
+processStep :: MonadIO m => Step -> CM m Bool
+processStep step
+  = do
+    cc <- ask
+    case parse cc "processStep" $ stBody step of
+      Left e
+        -> do
+          liftIO
+            $ hPutStrLn stderr
+            $ "The step "
+              ++ show (stBody step)
+              ++ " doesn't match any step definitions I know."
+              ++ show e
+          return False
+      Right m -> lift m >> return True
+
+data Options
+  = Options {file_ :: FilePath}
+    deriving (Eq, Show, Typeable, Data)
+
+getPath :: IO FilePath
+getPath
+  = do
+    progName <- getProgName
+    file_
+      <$> cmdArgs
+        (Options (def &= typ "PATH" &= argPos 0)
+          &= program progName
+          &= details
+            ["Run test scenarios specified on the abacate file at PATH."])
diff --git a/Test/Chuchu/Email.hs b/Test/Chuchu/Email.hs
new file mode 100644
--- /dev/null
+++ b/Test/Chuchu/Email.hs
@@ -0,0 +1,32 @@
+-- |
+-- Module      :  Test.Chuchu.Parsec
+-- Copyright   :  (c) Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com> 2012
+-- License     :  Apache 2.0 (see the file LICENSE)
+--
+-- Maintainer  :  Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+-- Stability   :  unstable
+-- Portability :  portable
+--
+-- This is a very simplified parser for e-mail, which does not follow RFC5322.
+-- Basically, it parses @TEXT\@TEXT@, where TEXT is @alphaNum <|> oneOf
+-- "!#$%&'*+-/=?^_`{|}~."@.  It's loosely based on
+-- <http://porg.es/blog/email-address-validation-simpler-faster-more-correct>.
+module Test.Chuchu.Email (addrSpecSimple) where
+
+-- base
+import Control.Applicative hiding ((<|>), many, optional)
+
+-- parsec
+import Text.Parsec
+import Text.Parsec.Text
+
+-- | Parses a simplified e-mail address and return everything that was parsed as
+-- a simple 'String'.
+addrSpecSimple :: Parser String
+addrSpecSimple = concat <$> sequence [atomWithDot, string "@", atomWithDot]
+
+atomWithDot :: Parser String
+atomWithDot = many1 atomTextWithDot
+
+atomTextWithDot :: Parser Char
+atomTextWithDot = alphaNum <|> oneOf "!#$%&'*+-/=?^_`{|}~."
diff --git a/Test/Chuchu/Parsec.hs b/Test/Chuchu/Parsec.hs
new file mode 100644
--- /dev/null
+++ b/Test/Chuchu/Parsec.hs
@@ -0,0 +1,215 @@
+{-# OPTIONS_GHC -w #-}
+-- |
+-- Module      :  Test.Chuchu.Parsec
+-- Copyright   :  (c) Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com> 2012
+-- License     :  Apache 2.0 (see the file LICENSE)
+--
+-- Maintainer  :  Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+-- Stability   :  unstable
+-- Portability :  portable
+--
+-- This is from the where clause of 'makeTokenParser' with types included and
+-- calls to 'lexeme' removed in the functions where this is noted.
+--
+-- Copyright 1999-2000, Daan Leijen; 2007, Paolo Martini. All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions are met:
+--
+-- * Redistributions of source code must retain the above copyright notice,
+--   this list of conditions and the following disclaimer.
+--
+-- * Redistributions in binary form must reproduce the above copyright
+--   notice, this list of conditions and the following disclaimer in the
+--   documentation and/or other materials provided with the distribution.
+--
+-- This software is provided by the copyright holders "as is" and any express or
+-- implied warranties, including, but not limited to, the implied warranties of
+-- merchantability and fitness for a particular purpose are disclaimed. In no
+-- event shall the copyright holders be liable for any direct, indirect,
+-- incidental, special, exemplary, or consequential damages (including, but not
+-- limited to, procurement of substitute goods or services; loss of use, data,
+-- or profits; or business interruption) however caused and on any theory of
+-- liability, whether in contract, strict liability, or tort (including
+-- negligence or otherwise) arising in any way out of the use of this software,
+-- even if advised of the possibility of such damage.
+
+
+module Test.Chuchu.Parsec (stringLiteral, natFloat, int) where
+
+-- base
+import Data.Char
+
+-- parsec
+import Text.Parsec
+import Text.Parsec.Text
+
+{-# ANN module ("HLint: ignore" :: String) #-}
+-- | 'lexeme' removed.
+stringLiteral :: Parser String
+stringLiteral   = do{ str <- between (char '"')
+                                     (char '"' <?> "end of string")
+                                     (many stringChar)
+                    ; return (foldr (maybe id (:)) "" str)
+                    }
+                  <?> "literal string"
+
+stringChar :: Parser (Maybe Char)
+stringChar      =   do{ c <- stringLetter; return (Just c) }
+                <|> stringEscape
+                <?> "string character"
+
+
+stringLetter :: Parser Char
+stringLetter    = satisfy (\c -> (c /= '"') && (c /= '\\') && (c > '\026'))
+
+stringEscape :: Parser (Maybe Char)
+stringEscape    = do{ char '\\'
+                    ;     do{ escapeGap  ; return Nothing }
+                      <|> do{ escapeEmpty; return Nothing }
+                      <|> do{ esc <- escapeCode; return (Just esc) }
+                    }
+
+escapeEmpty :: Parser Char
+escapeEmpty     = char '&'
+
+
+escapeGap :: Parser Char
+escapeGap       = do{ many1 space
+                    ; char '\\' <?> "end of string gap"
+                    }
+
+escapeCode :: Parser Char
+escapeCode      = charEsc <|> charNum <|> charAscii <|> charControl
+                <?> "escape code"
+
+charControl :: Parser Char
+charControl     = do{ char '^'
+                    ; code <- upper
+                    ; return (toEnum (fromEnum code - fromEnum 'A'))
+                    }
+
+charNum :: Parser Char
+charNum         = do{ code <- decimal
+                              <|> do{ char 'o'; number 8 octDigit }
+                              <|> do{ char 'x'; number 16 hexDigit }
+                    ; return (toEnum (fromInteger code))
+                    }
+
+charEsc :: Parser Char
+charEsc         = choice (map parseEsc escMap)
+                where
+                  parseEsc (c,code)     = do{ char c; return code }
+
+charAscii :: Parser Char
+charAscii       = choice (map parseAscii asciiMap)
+                where
+                  parseAscii (asc,code) = try (do{ string asc; return code })
+
+
+-- escape code tables
+escMap          = zip ("abfnrtv\\\"\'") ("\a\b\f\n\r\t\v\\\"\'")
+asciiMap        = zip (ascii3codes ++ ascii2codes) (ascii3 ++ ascii2)
+
+ascii2codes     = ["BS","HT","LF","VT","FF","CR","SO","SI","EM",
+                   "FS","GS","RS","US","SP"]
+ascii3codes     = ["NUL","SOH","STX","ETX","EOT","ENQ","ACK","BEL",
+                   "DLE","DC1","DC2","DC3","DC4","NAK","SYN","ETB",
+                   "CAN","SUB","ESC","DEL"]
+
+ascii2          = ['\BS','\HT','\LF','\VT','\FF','\CR','\SO','\SI',
+                   '\EM','\FS','\GS','\RS','\US','\SP']
+ascii3          = ['\NUL','\SOH','\STX','\ETX','\EOT','\ENQ','\ACK',
+                   '\BEL','\DLE','\DC1','\DC2','\DC3','\DC4','\NAK',
+                   '\SYN','\ETB','\CAN','\SUB','\ESC','\DEL']
+
+
+natFloat :: Parser (Either Integer Double)
+natFloat        = do{ char '0'
+                    ; zeroNumFloat
+                    }
+                  <|> decimalFloat
+
+zeroNumFloat :: Parser (Either Integer Double)
+zeroNumFloat    =  do{ n <- hexadecimal <|> octal
+                     ; return (Left n)
+                     }
+                <|> decimalFloat
+                <|> fractFloat 0
+                <|> return (Left 0)
+
+decimalFloat :: Parser (Either Integer Double)
+decimalFloat    = do{ n <- decimal
+                    ; option (Left n)
+                             (fractFloat n)
+                    }
+
+fractFloat :: Integer -> Parser (Either Integer Double)
+fractFloat n    = do{ f <- fractExponent n
+                    ; return (Right f)
+                    }
+
+fractExponent :: Integer -> Parser Double
+fractExponent n = do{ fract <- fraction
+                    ; expo  <- option 1.0 exponent'
+                    ; return ((fromInteger n + fract)*expo)
+                    }
+                <|>
+                  do{ expo <- exponent'
+                    ; return ((fromInteger n)*expo)
+                    }
+fraction :: Parser Double
+fraction        = do{ char '.'
+                    ; digits <- many1 digit <?> "fraction"
+                    ; return (foldr op 0.0 digits)
+                    }
+                  <?> "fraction"
+                where
+                  op d f    = (f + fromIntegral (digitToInt d))/10.0
+
+exponent' :: Parser Double
+exponent'       = do{ oneOf "eE"
+                    ; f <- sign
+                    ; e <- decimal <?> "exponent"
+                    ; return (power (f e))
+                    }
+                  <?> "exponent"
+                where
+                   power e  | e < 0      = 1.0/power(-e)
+                            | otherwise  = fromInteger (10^e)
+
+-- | 'lexeme' removed.
+int :: Parser Integer
+int             = do{ f <- sign
+                    ; n <- nat
+                    ; return (f n)
+                    }
+
+sign :: Num a => Parser (a -> a)
+sign            =   (char '-' >> return negate)
+                <|> (char '+' >> return id)
+                <|> return id
+
+nat :: Parser Integer
+nat             = zeroNumber <|> decimal
+
+zeroNumber :: Parser Integer
+zeroNumber      = do{ char '0'
+                    ; hexadecimal <|> octal <|> decimal <|> return 0
+                    }
+                  <?> ""
+
+decimal :: Parser Integer
+decimal         = number 10 digit
+
+hexadecimal :: Parser Integer
+hexadecimal     = do{ oneOf "xX"; number 16 hexDigit }
+
+octal :: Parser Integer
+octal           = do{ oneOf "oO"; number 8 octDigit  }
+
+number base baseDigit
+    = do{ digits <- many1 baseDigit
+        ; let n = foldl (\x d -> base*x + toInteger (digitToInt d)) 0 digits
+        ; seq n (return n)
+        }
diff --git a/Test/Chuchu/Parser.hs b/Test/Chuchu/Parser.hs
new file mode 100644
--- /dev/null
+++ b/Test/Chuchu/Parser.hs
@@ -0,0 +1,56 @@
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+-- |
+-- Module      :  Test.Chuchu.Parser
+-- Copyright   :  (c) Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com> 2012
+-- License     :  Apache 2.0 (see the file LICENSE)
+--
+-- Maintainer  :  Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+-- Stability   :  unstable
+-- Portability :  non-portable (TypeSynonymInstances, FlexibleInstances)
+--
+-- This modules provides some utility parsers for creating step rules.
+module Test.Chuchu.Parser (number, int, text, wildcard, email) where
+
+-- base
+import Control.Applicative hiding ((<|>))
+import Control.Monad
+import GHC.Exts
+
+-- parsec
+import Text.Parsec
+import Text.Parsec.Text
+
+-- chuchu
+import qualified Test.Chuchu.Parsec as P
+import Test.Chuchu.Email
+
+instance IsString (Parser a) where
+  fromString s = void (string s) >> return undefined
+
+-- | Parses a floating point number, with the same syntax as accepted by
+-- Haskell.
+number :: Parser Double
+number = nofToDouble <$> P.natFloat
+
+nofToDouble :: Either Integer Double -> Double
+nofToDouble (Left i) = fromInteger i
+nofToDouble (Right d) = d
+
+-- | Parses an integer.
+int :: Parser Integer
+int = P.int
+
+-- | Parses a quoted string, with the same syntax as accepted by Haskell.
+text :: Parser String
+text = P.stringLiteral
+
+-- | Parses anything until the string passed as parameter, and also the string.
+wildcard :: String -> Parser ()
+wildcard = void . manyTill anyChar . string
+
+-- | Parses a simplified e-mail address and return everything that was parsed as
+-- a simple 'String'.  This is a very simplified parser for e-mail, which does
+-- not follow RFC5322. Basically, it parses @TEXT\@TEXT@, where TEXT is
+-- @alphaNum \<|> oneOf \"!#$%&\'*+-\/=?^_\`{|}~.\"@.
+email :: Parser String
+email = addrSpecSimple
diff --git a/Test/Chuchu/Types.hs b/Test/Chuchu/Types.hs
new file mode 100644
--- /dev/null
+++ b/Test/Chuchu/Types.hs
@@ -0,0 +1,54 @@
+-- |
+-- Module      :  Test.Chuchu.Types
+-- Copyright   :  (c) Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com> 2012
+-- License     :  Apache 2.0 (see the file LICENSE)
+--
+-- Maintainer  :  Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+-- Stability   :  unstable
+-- Portability :  non-portable (GADTs)
+module
+  Test.Chuchu.Types
+  (Chuchu, ChuchuM (Given, When, Then, And, But), runChuchu)
+  where
+
+-- base
+import Control.Applicative hiding ((<|>))
+
+-- parsec
+import Text.Parsec
+import Text.Parsec.Text
+
+-- | The most command use case where the return value of the Monad is ignored.
+type Chuchu m  = ChuchuM m ()
+
+-- | The Monad on which the step rules are constructed.  'Given', 'When',
+-- 'Then', 'And' and 'But' are interpreted in the same way by the program.  All
+-- of them receive a parser and an action to run if the parser finishes
+-- correctly.
+data ChuchuM m a where
+  Given :: Parser a -> (a -> m ()) -> ChuchuM m ()
+  When :: Parser a -> (a -> m ()) -> ChuchuM m ()
+  Then :: Parser a -> (a -> m ()) -> ChuchuM m ()
+  And :: Parser a -> (a -> m ()) -> ChuchuM m ()
+  But :: Parser a -> (a -> m ()) -> ChuchuM m ()
+  Nil :: ChuchuM m a
+  Cons :: ChuchuM m b -> ChuchuM m a -> ChuchuM m a
+
+instance Monad (ChuchuM m) where
+  return _ = Nil
+  step >>= k = Cons step $ k undefined
+
+-- | Converts the Monad into a single 'Parser' that executes the specified
+-- action if the parser is executed correctly.  It includes an 'eof' on the
+-- parser of each step to avoid it from accepting prefixes of the desired rule.
+runChuchu :: ChuchuM m a -> Parser (m ())
+runChuchu Nil = unexpected "Unknown step"
+runChuchu (Cons cc1 cc2) = runChuchu cc1 <|> runChuchu cc2
+runChuchu (Given p f) = apply p f
+runChuchu (When p f) = apply p f
+runChuchu (Then p f) = apply p f
+runChuchu (And p f) = apply p f
+runChuchu (But p f) = apply p f
+
+apply :: Parser a -> (a -> m ()) -> Parser (m ())
+apply p f = try $ f <$> p <* eof
diff --git a/chuchu.cabal b/chuchu.cabal
new file mode 100644
--- /dev/null
+++ b/chuchu.cabal
@@ -0,0 +1,77 @@
+name: chuchu
+version: 0.0.0.0
+cabal-version: >= 1.8
+build-type: Simple
+license: OtherLicense
+license-file: LICENSE
+copyright: 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+author: Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+maintainer: Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+stability: experimental
+homepage: http://github.com/marcotmarcot/chuchu
+bug-reports: http://github.com/marcotmarcot/chuchu/issues
+synopsis: Behaviour Driven Development for Haskell
+description:
+  Chuchu is a system similar to Ruby's Cucumber for Behaviour Driven
+  Development.  It works with a language similar to Cucumber's Gherkin, which is
+  parsed using package abacate.
+category: Test
+tested-with: GHC ==7.4.2
+extra-source-files:
+  tests/data/environment.feature,
+  tests/data/calculator.feature,
+  tests/data/prefix.feature
+
+library
+  exposed-modules:
+    Test.Chuchu,
+    Test.Chuchu.Types,
+    Test.Chuchu.Parser
+  other-modules:
+    Test.Chuchu.Parsec,
+    Test.Chuchu.Email
+  build-depends:
+    base >= 4 && < 5,
+    text >= 0.11 && < 0.12,
+    transformers >= 0.3 && < 0.4,
+    parsec >= 3.1 && < 3.2,
+    cmdargs >= 0.9 && < 0.10,
+    abacate >= 0.0 && < 0.1
+  extensions: DeriveDataTypeable, TypeSynonymInstances, FlexibleInstances, GADTs
+  ghc-options: -Wall
+
+Test-Suite environment
+  type: exitcode-stdio-1.0
+  main-is: environment.hs
+  hs-source-dirs: tests
+  build-depends:
+    base >= 4 && < 5,
+    unix >= 2.5 && < 2.6,
+    chuchu,
+    HUnit >= 1.2 && < 1.3
+  extensions: OverloadedStrings
+  ghc-options: -Wall
+
+Test-Suite calculator
+  type: exitcode-stdio-1.0
+  main-is: calculator.hs
+  hs-source-dirs: tests
+  build-depends:
+    base >= 4 && < 5,
+    transformers >= 0.3 && < 0.4,
+    chuchu,
+    HUnit >= 1.2 && < 1.3
+  extensions: OverloadedStrings
+  ghc-options: -Wall
+
+Test-Suite prefix
+  type: exitcode-stdio-1.0
+  main-is: prefix.hs
+  hs-source-dirs: tests
+  build-depends:
+    base >= 4 && < 5,
+    transformers >= 0.3 && < 0.4,
+    chuchu,
+    HUnit >= 1.2 && < 1.3
+  extensions: OverloadedStrings
+  ghc-options: -Wall
diff --git a/tests/calculator.hs b/tests/calculator.hs
new file mode 100644
--- /dev/null
+++ b/tests/calculator.hs
@@ -0,0 +1,61 @@
+-- Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+-- base
+import Control.Applicative
+import System.Environment
+
+-- transformers
+import Control.Monad.IO.Class
+import Control.Monad.Trans.State
+
+-- chuchu
+import Test.Chuchu
+
+-- HUnit
+import Test.HUnit
+
+type CalculatorT m = StateT [Double] m
+
+enterNumber :: Monad m => Double -> CalculatorT m ()
+enterNumber = modify . (:)
+
+getDisplay :: Monad m => CalculatorT m Double
+getDisplay
+  = do
+    ns <- get
+    return $ head $ ns ++ [0]
+
+divide :: Monad m => CalculatorT m ()
+divide = do
+  (n1:n2:ns) <- get
+  put $ (n1 / n2) : ns
+
+defs :: Chuchu (CalculatorT IO)
+defs
+  = do
+    Given
+      ("that I have entered " *> number <* " into the calculator")
+      enterNumber
+    When "I press divide" $ const divide
+    Then ("the result should be " *> number <* " on the screen")
+      $ \n
+        -> do
+          d <- getDisplay
+          liftIO $ d @?= n
+
+main :: IO ()
+main
+  = withArgs ["tests/data/calculator.feature"]
+    $ chuchuMain defs (`evalStateT` [])
diff --git a/tests/data/calculator.feature b/tests/data/calculator.feature
new file mode 100644
--- /dev/null
+++ b/tests/data/calculator.feature
@@ -0,0 +1,27 @@
+# Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Of course it needs calc!
+@needs_calc
+@nice_feature
+Feature: Division
+  In order to avoid silly mistakes
+  Cashiers must be able to calculate a fraction
+
+  Scenario: Regular numbers
+    Given that I have entered 2 into the calculator
+    # Comment! =)
+    And that I have entered 3 into the calculator
+    When I press divide
+    Then the result should be 1.5 on the screen
diff --git a/tests/data/environment.feature b/tests/data/environment.feature
new file mode 100644
--- /dev/null
+++ b/tests/data/environment.feature
@@ -0,0 +1,26 @@
+# Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+Feature: Environment
+  In order to use the enviroment variables
+  Programmers must be able to write and read environment variables
+
+  Scenario: Write then read
+    When I set the variable as "environment" into the environment
+    # Comment! =)
+    Then the variable should have "environment" on its content
+
+  Scenario: E-mail variables
+    When I set the  as e-mail marcotmarcot@gmail.com into the environment
+    Then the  should have e-mail marcotmarcot@gmail.com on its content
diff --git a/tests/data/prefix.feature b/tests/data/prefix.feature
new file mode 100644
--- /dev/null
+++ b/tests/data/prefix.feature
@@ -0,0 +1,22 @@
+# Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+Feature: Don't match prefixes
+  In order to write scenarios without worrying
+  Programmers must be able to write steps that are prefix of others
+
+  Scenario: Prefixes
+    When I add 1
+    And I add 1 2 times
+    Then the result should be 3
diff --git a/tests/environment.hs b/tests/environment.hs
new file mode 100644
--- /dev/null
+++ b/tests/environment.hs
@@ -0,0 +1,50 @@
+-- Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+-- base
+import Control.Applicative
+import Data.Maybe
+import System.Environment hiding (getEnv)
+
+-- unix
+import System.Posix.Env
+
+-- chuchu
+import Test.Chuchu
+
+-- HUnit
+import Test.HUnit
+
+defs :: Chuchu IO
+defs
+  = do
+    When ("I set the " *> wildcard " as " *> text <* " into the environment")
+      $ \x -> setEnv "environment" x True
+    Then ("the " *> wildcard " should have " *> text <* " on its content")
+      $ \n -> fromJust <$> getEnv "environment" >>= (@?= n)
+    When
+        ("I set the "
+          *> wildcard " as e-mail "
+          *> email
+          <* " into the environment")
+      $ \x -> setEnv "environment" x True
+    Then
+        ("the "
+          *> wildcard " should have e-mail "
+          *> email
+          <* " on its content")
+      $ \n -> fromJust <$> getEnv "environment" >>= (@?= n)
+
+main :: IO ()
+main = withArgs ["tests/data/environment.feature"] $ chuchuMain defs id
diff --git a/tests/prefix.hs b/tests/prefix.hs
new file mode 100644
--- /dev/null
+++ b/tests/prefix.hs
@@ -0,0 +1,42 @@
+-- Copyright 2012 Marco Túlio Pimenta Gontijo <marcotmarcot@gmail.com>
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+-- base
+import Control.Applicative
+import System.Environment
+
+-- transformers
+import Control.Monad.IO.Class
+import Control.Monad.Trans.State
+
+-- chuchu
+import Test.Chuchu
+
+-- HUnit
+import Test.HUnit
+
+type CalculatorT m = StateT Integer m
+
+defs :: Chuchu (CalculatorT IO)
+defs
+  = do
+    When ("I add " *> int) $ \x -> modify (+ x)
+    When ((,) <$ "I add " <*> int <* " " <*> int <* " times")
+      $ \(n, x) -> modify (+ n * x)
+    When ("the result should be " *> int) $ \x -> get >>= liftIO . (@?= x)
+
+main :: IO ()
+main
+  = withArgs ["tests/data/prefix.feature"]
+    $ chuchuMain defs (`evalStateT` 0)
