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22 lines
596 B
Python
22 lines
596 B
Python
import pytest # type: ignore
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from typing import Callable, TypeVar
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from monads import Applicative
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from .fixtures import monad
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T = TypeVar("T")
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S = TypeVar("S")
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def test_fmap_using_ap(monad) -> None:
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f: Callable[[int], int] = lambda x: x + 1
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m: Applicative[int] = monad.pure(3)
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assert m.map(f) == m.apply(monad.pure(f))
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def test_apply_and_operator(monad) -> None:
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subtract: Callable[[int], Callable[[int], int]] = lambda x: lambda y: x - y
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ten = monad.pure(10)
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six = monad.pure(6)
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functor = ten.map(subtract)
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assert six.apply(functor) == subtract * ten & six
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