Test.Hspec.NeedEnv

Synopsis:

module Synopsis (main,spec) where

import Control.Applicative ((<$>), (<*>))
import Test.Hspec (Spec, SpecWith, hspec, before, describe, it, shouldBe)
import Test.Hspec.NeedEnv (EnvMode(Need), needEnv, needEnvRead)

main :: IO ()
main = hspec spec

-- | Read environment variables for parameters necessary for testing.
getEnvs :: IO (String, Int)
getEnvs = (,)
          <$> needEnv mode "TEST_USER_NAME"
          <*> needEnvRead mode "TEST_SEED"
  where
    mode = Need

spec :: Spec
spec = before getEnvs $ specWithUserAndSeed
       -- ^ Use 'before' and similar functions to write 'SpecWith'
       -- that takes parameters.

-- | Test spec that depends on the environment variables.
specWithUserAndSeed :: SpecWith (String, Int)
specWithUserAndSeed = describe "funcUnderTest" $ do
  it "should do something" $ \(user_name, seed) -> do
    funcUnderTest user_name seed `shouldBe` "SOMETHING"

funcUnderTest :: String -> Int -> String
funcUnderTest = undefined

This module exports needEnv and other similar functions that read environment variables in hspec tests. They are useful to write tests that depend on some external entities, e.g. Web servers, database servers and random number generators.

Basics

data EnvMode

How to treat missing environment variable.

Constructors

Need

If the environment variable is not set, the test fails.

Want

If the environment variable is not set, the test gets pending.

Instances

Bounded EnvMode

Defined in Test.Hspec.NeedEnv

Methods

minBound :: EnvMode

maxBound :: EnvMode

Enum EnvMode

Defined in Test.Hspec.NeedEnv

Methods

succ :: EnvMode -> EnvMode

pred :: EnvMode -> EnvMode

toEnum :: Int -> EnvMode

fromEnum :: EnvMode -> Int

enumFrom :: EnvMode -> [EnvMode]

enumFromThen :: EnvMode -> EnvMode -> [EnvMode]

enumFromTo :: EnvMode -> EnvMode -> [EnvMode]

enumFromThenTo :: EnvMode -> EnvMode -> EnvMode -> [EnvMode]

Show EnvMode

Defined in Test.Hspec.NeedEnv

Methods

showsPrec :: Int -> EnvMode -> ShowS

show :: EnvMode -> String

showList :: [EnvMode] -> ShowS

Eq EnvMode

Defined in Test.Hspec.NeedEnv

Methods

(==) :: EnvMode -> EnvMode -> Bool

(/=) :: EnvMode -> EnvMode -> Bool

Ord EnvMode

Defined in Test.Hspec.NeedEnv

Methods

compare :: EnvMode -> EnvMode -> Ordering

(<) :: EnvMode -> EnvMode -> Bool

(<=) :: EnvMode -> EnvMode -> Bool

(>) :: EnvMode -> EnvMode -> Bool

(>=) :: EnvMode -> EnvMode -> Bool

max :: EnvMode -> EnvMode -> EnvMode

min :: EnvMode -> EnvMode -> EnvMode

needEnv

Arguments

:: EnvMode

-> String

name of the environment variable

-> IO String

value of the environment variable

Get value of the specified environment variable. If the environment variable is not set, it executes the action specified by the EnvMode.

needEnvParse

Arguments

:: EnvMode

-> (String -> Either String a)

the parser of the environment variable

-> String

-> IO a

Get environment variable by needEnv, and parse the value. If it fails to parse, the test fails.

needEnvRead :: Read a => EnvMode -> String -> IO a

Parse the environment variable with Read class.

Utilities

needEnvHostPort

Arguments

:: EnvMode

-> String

prefix of environment variables

-> IO (String, Int)

Get the pair of hostname and port number from environment variables.

It reads environment variables (prefix ++ "_HOST") and (prefix ++ "_PORT").