def test_safe_wrapped_function_returns_ok() -> None: error: Exception = Exception("oops") @safe def unsafe(x: int) -> int: if x > 5: raise error else: return x + 1 result: Result[int, Exception] = unsafe(5) assert Ok(6) == result
def test_pipeline() -> None: class Frobnicator(object): @classmethod def create(cls, config: dict) -> Result[Frobnicator, str]: return Ok(cls()) def dostuff(self) -> Result[list, str]: return Ok(["a", "b", "c", "d"]) def load_config() -> Result[dict, str]: return Ok({"foo": "bar"}) result: Result[int, str] = ( load_config() >> Frobnicator.create >> Frobnicator.dostuff >> (lambda res: Ok(len(res)))) assert 4 == result.withDefault(0)
def test_map() -> None: result: Result[int, str] = Ok(5) mapped: Result[str, str] = result.map(str) assert "5" == mapped.withDefault("0")
def test_ok_withdefault() -> None: m: Result[int, str] = Ok(5) assert 5 == m.withDefault(0)
def test_apply_err_to_ok() -> None: m: Result[int, str] = Ok(5) f: Result[Callable[[int], int], str] = Err("oops") assert Err("oops") == m.apply(f)
def test_apply_ok_to_ok() -> None: m: Result[int, str] = Ok(5) increment: Callable[[int], int] = lambda x: x + 1 assert Ok(6) == m.apply(Result.pure(increment))
def test_bind_err() -> None: m: Result[int, str] = Err("oops") increment: Callable[[int], Result[int, str]] = lambda x: Ok(x + 1) assert Err("oops") == m.bind(increment)
def test_just_to_result() -> None: assert Ok(3) == Just(3).toResult("oops")
def test_bind_infix() -> None: result: Result[int, str] = Ok(5) incremented: Result[int, str] = result >> (lambda x: Ok(x + 1)) assert 6 == incremented.withDefault(0)
def test_from_just() -> None: m: Maybe[int] = Just(6) result: Result[int, str] = Result.fromMaybe(m, "error") assert Ok(6) == result
def load_config() -> Result[dict, str]: return Ok({"foo": "bar"})
def dostuff(self) -> Result[list, str]: return Ok(["a", "b", "c", "d"])
def create(cls, config: dict) -> Result[Frobnicator, str]: return Ok(cls())
def test_from_ok() -> None: assert Just(3) == Maybe.fromResult(Ok(3))
def test_map_infix() -> None: result: Result[int, str] = Ok(5) mapped: Result[str, str] = result * str assert "5" == mapped.withDefault("0")
def test_map_error_ok() -> None: m: Result[int, str] = Ok(123) assert Ok(123) == m.mapError(len)
def test_ok_to_maybe() -> None: result: Result[int, str] = Ok(6) assert Just(6) == result.toMaybe()
def test_bind_ok() -> None: m: Result[int, str] = Ok(5) increment: Callable[[int], Result[int, str]] = lambda x: Ok(x + 1) assert Ok(6) == m.bind(increment)
def test_ok_to_optional() -> None: assert 2 == Ok(2).toOptional()