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19 lines
448 B
Python
19 lines
448 B
Python
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import pytest # type: ignore
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from typing import Callable, Type, TypeVar
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from monads import Applicative, Functor, Maybe, Result
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T = TypeVar("T")
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S = TypeVar("S")
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@pytest.fixture(scope="module", params=[Maybe, Result])
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def monad(request) -> Type:
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return request.param
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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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