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from io import BytesIO, StringIO, TextIOWrapper
import isort
class UnseekableTextIOWrapper(TextIOWrapper):
def seek(self, *args, **kwargs):
raise ValueError("underlying stream is not seekable")
class UnreadableStream(StringIO):
def readable(self, *args, **kwargs) -> bool:
return False
def as_stream(text: str) -> UnseekableTextIOWrapper:
return UnseekableTextIOWrapper(BytesIO(text.encode("utf8")))
def isort_test(code: str, expected_output: str = "", **config):
"""Runs isort against the given code snippet and ensures that it
gives consistent output across multiple runs, and if an expected_output
is given - that it matches that.
"""
expected_output = expected_output or code
output = isort.code(code, **config)
assert output == expected_output
assert output == isort.code(output, **config)
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