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import pytest
from uvicorn.importer import ImportFromStringError, import_from_string
def test_invalid_format() -> None:
with pytest.raises(ImportFromStringError) as exc_info:
import_from_string("example:")
expected = 'Import string "example:" must be in format "<module>:<attribute>".'
assert expected in str(exc_info.value)
def test_invalid_module() -> None:
with pytest.raises(ImportFromStringError) as exc_info:
import_from_string("module_does_not_exist:myattr")
expected = 'Could not import module "module_does_not_exist".'
assert expected in str(exc_info.value)
def test_invalid_attr() -> None:
with pytest.raises(ImportFromStringError) as exc_info:
import_from_string("tempfile:attr_does_not_exist")
expected = 'Attribute "attr_does_not_exist" not found in module "tempfile".'
assert expected in str(exc_info.value)
def test_internal_import_error() -> None:
with pytest.raises(ImportError):
import_from_string("tests.importer.raise_import_error:myattr")
def test_valid_import() -> None:
instance = import_from_string("tempfile:TemporaryFile")
from tempfile import TemporaryFile
assert instance == TemporaryFile
def test_no_import_needed() -> None:
from tempfile import TemporaryFile
instance = import_from_string(TemporaryFile)
assert instance == TemporaryFile
def test_circular_import_error() -> None:
with pytest.raises(ImportError) as exc_info:
import_from_string("tests.importer.circular_import_a:bar")
expected = (
"cannot import name 'bar' from partially initialized module "
"'tests.importer.circular_import_a' (most likely due to a circular import)"
)
assert expected in str(exc_info.value)
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