| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell98 |
Test.Hspec.Expectations
Contents
Description
Introductory documentation: https://github.com/sol/hspec-expectations#readme
- type Expectation = Assertion
- expectationFailure :: String -> Expectation
- shouldBe :: (Show a, Eq a) => a -> a -> Expectation
- shouldSatisfy :: Show a => a -> (a -> Bool) -> Expectation
- shouldContain :: (Show a, Eq a) => [a] -> [a] -> Expectation
- shouldMatchList :: (Show a, Eq a) => [a] -> [a] -> Expectation
- shouldReturn :: (Show a, Eq a) => IO a -> a -> Expectation
- shouldThrow :: Exception e => IO a -> Selector e -> Expectation
- type Selector a = a -> Bool
- anyException :: Selector SomeException
- anyErrorCall :: Selector ErrorCall
- anyIOException :: Selector IOException
- anyArithException :: Selector ArithException
- errorCall :: String -> Selector ErrorCall
Setting expectations
type Expectation = Assertion Source
expectationFailure :: String -> Expectation Source
This is just an alias for HUnit's assertFailure.
shouldBe :: (Show a, Eq a) => a -> a -> Expectation infix 1 Source
actual `shouldBe` expected sets the expectation that actual is equal
to expected (this is just an alias for @?=).
shouldSatisfy :: Show a => a -> (a -> Bool) -> Expectation infix 1 Source
v `shouldSatisfy` p sets the expectation that p v is True.
shouldContain :: (Show a, Eq a) => [a] -> [a] -> Expectation infix 1 Source
list `shouldContain` sublist sets the expectation that sublist is contained,
wholly and intact, anywhere in list.
shouldMatchList :: (Show a, Eq a) => [a] -> [a] -> Expectation infix 1 Source
xs `shouldMatchList` ys sets the expectation that xs has the same
elements that ys has, possibly in another order
shouldReturn :: (Show a, Eq a) => IO a -> a -> Expectation infix 1 Source
action `shouldReturn` expected sets the expectation that action
returns expected.
Expecting exceptions
shouldThrow :: Exception e => IO a -> Selector e -> Expectation infix 1 Source
action `shouldThrow` selector sets the expectation that action throws
an exception. The precise nature of the expected exception is described
with a Selector.
Selecting exceptions
type Selector a = a -> Bool Source
A Selector is a predicate; it can simultaneously constrain the type and
value of an exception.
Predefined type-based selectors
There are predefined selectors for some standard exceptions. Each selector
is just const True with an appropriate type.
Combinators for defining value-based selectors
Some exceptions (most prominently ErrorCall) have no Eq instance.
Selecting a specific value would require pattern matching.
For such exceptions, combinators that construct selectors are provided. Each combinator corresponds to a constructor; it takes the same arguments, and has the same name (but starting with a lower-case letter).