import re from typing import TYPE_CHECKING, Any, Callable, TypeVar from unittest.mock import patch import pytest from click.testing import CliRunner from tests.util import DETERMINISTIC_HEADER, read_data try: from aiohttp import web from aiohttp.test_utils import AioHTTPTestCase import blackd except ImportError as e: raise RuntimeError("Please install Black with the 'd' extra") from e if TYPE_CHECKING: F = TypeVar("F", bound=Callable[..., Any]) unittest_run_loop: Callable[[F], F] = lambda x: x else: try: from aiohttp.test_utils import unittest_run_loop except ImportError: # unittest_run_loop is unnecessary and a no-op since aiohttp 3.8, and # aiohttp 4 removed it. To maintain compatibility we can make our own # no-op decorator. def unittest_run_loop(func, *args, **kwargs): return func @pytest.mark.blackd class BlackDTestCase(AioHTTPTestCase): # type: ignore[misc] def test_blackd_main(self) -> None: with patch("blackd.web.run_app"): result = CliRunner().invoke(blackd.main, []) if result.exception is not None: raise result.exception self.assertEqual(result.exit_code, 0) async def get_application(self) -> web.Application: return blackd.make_app() @unittest_run_loop async def test_blackd_request_needs_formatting(self) -> None: response = await self.client.post("/", data=b"print('hello world')") self.assertEqual(response.status, 200) self.assertEqual(response.charset, "utf8") self.assertEqual(await response.read(), b'print("hello world")\n') @unittest_run_loop async def test_blackd_request_no_change(self) -> None: response = await self.client.post("/", data=b'print("hello world")\n') self.assertEqual(response.status, 204) self.assertEqual(await response.read(), b"") @unittest_run_loop async def test_blackd_request_syntax_error(self) -> None: response = await self.client.post("/", data=b"what even ( is") self.assertEqual(response.status, 400) content = await response.text() self.assertTrue( content.startswith("Cannot parse"), msg=f"Expected error to start with 'Cannot parse', got {repr(content)}", ) @unittest_run_loop async def test_blackd_unsupported_version(self) -> None: response = await self.client.post( "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "2"} ) self.assertEqual(response.status, 501) @unittest_run_loop async def test_blackd_supported_version(self) -> None: response = await self.client.post( "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "1"} ) self.assertEqual(response.status, 200) @unittest_run_loop async def test_blackd_invalid_python_variant(self) -> None: async def check(header_value: str, expected_status: int = 400) -> None: response = await self.client.post( "/", data=b"what", headers={blackd.PYTHON_VARIANT_HEADER: header_value}, ) self.assertEqual(response.status, expected_status) await check("lol") await check("ruby3.5") await check("pyi3.6") await check("py1.5") await check("2") await check("2.7") await check("py2.7") await check("2.8") await check("py2.8") await check("3.0") await check("pypy3.0") await check("jython3.4") @unittest_run_loop async def test_blackd_pyi(self) -> None: source, expected = read_data("miscellaneous", "stub.pyi") response = await self.client.post( "/", data=source, headers={blackd.PYTHON_VARIANT_HEADER: "pyi"} ) self.assertEqual(response.status, 200) self.assertEqual(await response.text(), expected) @unittest_run_loop async def test_blackd_diff(self) -> None: diff_header = re.compile( r"(In|Out)\t\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d\.\d\d\d\d\d\d \+\d\d\d\d" ) source, _ = read_data("miscellaneous", "blackd_diff") expected, _ = read_data("miscellaneous", "blackd_diff.diff") response = await self.client.post( "/", data=source, headers={blackd.DIFF_HEADER: "true"} ) self.assertEqual(response.status, 200) actual = await response.text() actual = diff_header.sub(DETERMINISTIC_HEADER, actual) self.assertEqual(actual, expected) @unittest_run_loop async def test_blackd_python_variant(self) -> None: code = ( "def f(\n" " and_has_a_bunch_of,\n" " very_long_arguments_too,\n" " and_lots_of_them_as_well_lol,\n" " **and_very_long_keyword_arguments\n" "):\n" " pass\n" ) async def check(header_value: str, expected_status: int) -> None: response = await self.client.post( "/", data=code, headers={blackd.PYTHON_VARIANT_HEADER: header_value} ) self.assertEqual( response.status, expected_status, msg=await response.text() ) await check("3.6", 200) await check("py3.6", 200) await check("3.6,3.7", 200) await check("3.6,py3.7", 200) await check("py36,py37", 200) await check("36", 200) await check("3.6.4", 200) await check("3.4", 204) await check("py3.4", 204) await check("py34,py36", 204) await check("34", 204) @unittest_run_loop async def test_blackd_line_length(self) -> None: response = await self.client.post( "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "7"} ) self.assertEqual(response.status, 200) @unittest_run_loop async def test_blackd_invalid_line_length(self) -> None: response = await self.client.post( "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "NaN"}, ) self.assertEqual(response.status, 400) @unittest_run_loop async def test_blackd_skip_first_source_line(self) -> None: invalid_first_line = b"Header will be skipped\r\ni = [1,2,3]\nj = [1,2,3]\n" expected_result = b"Header will be skipped\r\ni = [1, 2, 3]\nj = [1, 2, 3]\n" response = await self.client.post("/", data=invalid_first_line) self.assertEqual(response.status, 400) response = await self.client.post( "/", data=invalid_first_line, headers={blackd.SKIP_SOURCE_FIRST_LINE: "true"}, ) self.assertEqual(response.status, 200) self.assertEqual(await response.read(), expected_result) @unittest_run_loop async def test_blackd_preview(self) -> None: response = await self.client.post( "/", data=b'print("hello")\n', headers={blackd.PREVIEW: "true"} ) self.assertEqual(response.status, 204) @unittest_run_loop async def test_blackd_response_black_version_header(self) -> None: response = await self.client.post("/") self.assertIsNotNone(response.headers.get(blackd.BLACK_VERSION_HEADER)) @unittest_run_loop async def test_cors_preflight(self) -> None: response = await self.client.options( "/", headers={ "Access-Control-Request-Method": "POST", "Origin": "*", "Access-Control-Request-Headers": "Content-Type", }, ) self.assertEqual(response.status, 200) self.assertIsNotNone(response.headers.get("Access-Control-Allow-Origin")) self.assertIsNotNone(response.headers.get("Access-Control-Allow-Headers")) self.assertIsNotNone(response.headers.get("Access-Control-Allow-Methods")) @unittest_run_loop async def test_cors_headers_present(self) -> None: response = await self.client.post("/", headers={"Origin": "*"}) self.assertIsNotNone(response.headers.get("Access-Control-Allow-Origin")) self.assertIsNotNone(response.headers.get("Access-Control-Expose-Headers")) @unittest_run_loop async def test_preserves_line_endings(self) -> None: for data in (b"c\r\nc\r\n", b"l\nl\n"): # test preserved newlines when reformatted response = await self.client.post("/", data=data + b" ") self.assertEqual(await response.text(), data.decode()) # test 204 when no change response = await self.client.post("/", data=data) self.assertEqual(response.status, 204) @unittest_run_loop async def test_normalizes_line_endings(self) -> None: for data, expected in ((b"c\r\nc\n", "c\r\nc\r\n"), (b"l\nl\r\n", "l\nl\n")): response = await self.client.post("/", data=data) self.assertEqual(await response.text(), expected) self.assertEqual(response.status, 200)