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test_result_do.py
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from __future__ import annotations
import pytest
from result import Err, Ok, Result, do, do_async
def test_result_do_general() -> None:
def resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
def resy(is_suc: bool) -> Result[bool, int]:
return Ok(True) if is_suc else Err(2)
def _get_output(is_suc1: bool, is_suc2: bool) -> Result[float, int]:
out: Result[float, int] = do(
Ok(len(x) + int(y) + 0.5) for x in resx(is_suc1) for y in resy(is_suc2)
)
return out
assert _get_output(True, True) == Ok(6.5)
assert _get_output(True, False) == Err(2)
assert _get_output(False, True) == Err(1)
assert _get_output(False, False) == Err(1)
def _get_output_return_immediately(
is_suc1: bool, is_suc2: bool
) -> Result[float, int]:
return do(
Ok(len(x) + int(y) + 0.5) for x in resx(is_suc1) for y in resy(is_suc2)
)
assert _get_output_return_immediately(True, True) == Ok(6.5)
@pytest.mark.asyncio
async def test_result_do_general_with_async_values() -> None:
# Asyncio works with regular `do()` as long as you await
# the async calls outside the `do()` expression.
# This causes the generator to be a regular (not async) generator.
async def aget_resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
async def aget_resy(is_suc: bool) -> Result[bool, int]:
return Ok(True) if is_suc else Err(2)
async def _aget_output(is_suc1: bool, is_suc2: bool) -> Result[float, int]:
resx, resy = await aget_resx(is_suc1), await aget_resy(is_suc2)
out: Result[float, int] = do(
Ok(len(x) + int(y) + 0.5) for x in resx for y in resy
)
return out
assert await _aget_output(True, True) == Ok(6.5)
assert await _aget_output(True, False) == Err(2)
assert await _aget_output(False, True) == Err(1)
assert await _aget_output(False, False) == Err(1)
@pytest.mark.asyncio
async def test_result_do_async_one_value() -> None:
"""This is a strange case where Python creates a regular
(non async) generator despite an `await` inside the generator expression.
For convenience, although this works with regular `do()`, we want to support this
with `do_async()` as well."""
async def aget_resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
def get_resz(is_suc: bool) -> Result[float, int]:
return Ok(0.5) if is_suc else Err(3)
assert await do_async(Ok(len(x)) for x in await aget_resx(True)) == Ok(5)
assert await do_async(Ok(len(x)) for x in await aget_resx(False)) == Err(1)
async def _aget_output(is_suc1: bool, is_suc3: bool) -> Result[float, int]:
return await do_async(
Ok(len(x) + z) for x in await aget_resx(is_suc1) for z in get_resz(is_suc3)
)
assert await _aget_output(True, True) == Ok(5.5)
assert await _aget_output(True, False) == Err(3)
assert await _aget_output(False, True) == Err(1)
assert await _aget_output(False, False) == Err(1)
@pytest.mark.asyncio
async def test_result_do_async_general() -> None:
async def aget_resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
async def aget_resy(is_suc: bool) -> Result[bool, int]:
return Ok(True) if is_suc else Err(2)
def get_resz(is_suc: bool) -> Result[float, int]:
return Ok(0.5) if is_suc else Err(3)
async def _aget_output(
is_suc1: bool, is_suc2: bool, is_suc3: bool
) -> Result[float, int]:
out: Result[float, int] = await do_async(
Ok(len(x) + int(y) + z)
for x in await aget_resx(is_suc1)
for y in await aget_resy(is_suc2)
for z in get_resz(is_suc3)
)
return out
assert await _aget_output(True, True, True) == Ok(6.5)
assert await _aget_output(True, False, True) == Err(2)
assert await _aget_output(False, True, True) == Err(1)
assert await _aget_output(False, False, True) == Err(1)
assert await _aget_output(True, True, False) == Err(3)
assert await _aget_output(True, False, False) == Err(2)
assert await _aget_output(False, True, False) == Err(1)
assert await _aget_output(False, False, False) == Err(1)
async def _aget_output_return_immediately(
is_suc1: bool, is_suc2: bool, is_suc3: bool
) -> Result[float, int]:
return await do_async(
Ok(len(x) + int(y) + z)
for x in await aget_resx(is_suc1)
for y in await aget_resy(is_suc2)
for z in get_resz(is_suc3)
)
assert await _aget_output_return_immediately(True, True, True) == Ok(6.5)
@pytest.mark.asyncio
async def test_result_do_async_further_processing() -> None:
async def aget_resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
async def aget_resy(is_suc: bool) -> Result[bool, int]:
return Ok(True) if is_suc else Err(2)
def get_resz(is_suc: bool) -> Result[float, int]:
return Ok(0.5) if is_suc else Err(3)
async def process_xyz(x: str, y: bool, z: float) -> Result[float, int]:
return Ok(len(x) + int(y) + z)
async def _aget_output(
is_suc1: bool, is_suc2: bool, is_suc3: bool
) -> Result[float, int]:
out: Result[float, int] = await do_async(
Ok(w)
for x in await aget_resx(is_suc1)
for y in await aget_resy(is_suc2)
for z in get_resz(is_suc3)
for w in await process_xyz(x, y, z)
)
return out
assert await _aget_output(True, True, True) == Ok(6.5)
assert await _aget_output(True, False, True) == Err(2)
assert await _aget_output(False, True, True) == Err(1)
assert await _aget_output(False, False, True) == Err(1)
assert await _aget_output(True, True, False) == Err(3)
assert await _aget_output(True, False, False) == Err(2)
assert await _aget_output(False, True, False) == Err(1)
assert await _aget_output(False, False, False) == Err(1)
@pytest.mark.asyncio
async def test_result_do_general_with_async_values_inline_error() -> None:
"""
Due to subtle behavior, `do()` works in certain cases involving async
calls but not others. We surface a more helpful error to the user
in cases where it doesn't work indicating to use `do_async()` instead.
Contrast this with `test_result_do_general_with_async_values()`
in which using `do()` works with async functions as long as
their return values are resolved outside the `do()` expression.
"""
async def aget_resx(is_suc: bool) -> Result[str, int]:
return Ok("hello") if is_suc else Err(1)
async def aget_resy(is_suc: bool) -> Result[bool, int]:
return Ok(True) if is_suc else Err(2)
def get_resz(is_suc: bool) -> Result[float, int]:
return Ok(0.5) if is_suc else Err(3)
with pytest.raises(TypeError) as excinfo:
do(
Ok(len(x) + int(y) + z)
for x in await aget_resx(True)
for y in await aget_resy(True)
for z in get_resz(True)
)
assert (
"Got async_generator but expected generator.See the section on do notation in the README."
) in excinfo.value.args[0]
@pytest.mark.asyncio
async def test_result_do_async_swap_order() -> None:
def foo() -> Result[int, str]:
return Ok(1)
async def bar() -> Result[int, str]:
return Ok(2)
result1: Result[int, str] = await do_async(
Ok(x + y)
# x first
for x in foo()
# then y
for y in await bar()
)
result2: Result[int, str] = await do_async(
Ok(x + y)
# y first
for y in await bar()
# then x
for x in foo()
)
assert result1 == result2 == Ok(3)