57 lines
2 KiB
Plaintext
57 lines
2 KiB
Plaintext
module Test.Main where
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import Prelude
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import Data.Int (fromString)
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import Data.Maybe (Maybe(..), maybe)
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import Effect (Effect)
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import Effect.Aff (launchAff_)
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import Run (Run, extract)
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import Run.Supply (SUPPLY, generate, ignoreMaybes, localSupply, runSupply)
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import Test.Spec (Spec, describe, it)
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import Test.Spec.Assertions (shouldEqual)
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import Test.Spec.Reporter (consoleReporter)
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import Test.Spec.Runner (runSpec)
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add2 :: forall r. Run (SUPPLY Int r) Int
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add2 = ado
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a <- generate
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b <- generate
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in a + b
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add4 :: forall r. Run (SUPPLY Int r) Int
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add4 = ado
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a <- add2
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b <- add2
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in a + b
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spec :: Spec Unit
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spec = describe "The supply effect" do
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describe "runSupply" do
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it "`generate + generate` should be the sum of the first 2 numbers" do
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let val = extract $ runSupply ((+) 3) 0 add2
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val `shouldEqual` 3 -- 0 + (0 + 3)
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let val' = extract $ runSupply ((+) 3) 4 add2
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val' `shouldEqual` 11 -- 4 + (4 + 3)
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describe "localSupply" do
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it "should allow mapping over the generated values" do
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let val = extract $ runSupply ((+) 1) 0 $ localSupply ((+) 4) add2
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val `shouldEqual` 9 -- (0 + 4) + ((0 + 1) + 4)
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let val' = extract $ runSupply ((+) 1) 4 $ localSupply ((*) (-1)) add2
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val' `shouldEqual` (-9) -- (-1 * 4) + (-1 * (4 + 1))
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describe "ignoreMaybes" do
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it "should work as usual if everything is a Just" do
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let val = extract $ runSupply (map ((+) 3)) (Just 0) $ ignoreMaybes add2
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val `shouldEqual` 3 -- 0 + (0 + 3)
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it "should skip over Nothings" do
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let runner = maybe (Just 2) (const Nothing)
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let val = extract $ runSupply runner Nothing $ ignoreMaybes add2
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val `shouldEqual` 4 -- 2 + 2
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it "should skip over mapped Nothings" do
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let withThrees m = extract $ runSupply ((<>) "3") "" $ localSupply fromString $ ignoreMaybes m
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(withThrees add2) `shouldEqual` 36 -- 3 + 33
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(withThrees add4) `shouldEqual` 3702 -- 3 + 33 + 333 + 333
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main :: Effect Unit
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main = launchAff_ $ runSpec [consoleReporter] spec |