tests/test_blackd.py

   1 import re
   2 from unittest.mock import patch
   3
   4 from click.testing import CliRunner
   5 import pytest
   6
   7 from tests.util import read_data, DETERMINISTIC_HEADER
   8
   9 try:
  10     import blackd
  11     from aiohttp.test_utils import AioHTTPTestCase, unittest_run_loop
  12     from aiohttp import web
  13 except ImportError:
  14     has_blackd_deps = False
  15 else:
  16     has_blackd_deps = True
  17
  18
  19 @pytest.mark.blackd
  20 class BlackDTestCase(AioHTTPTestCase):
  21     def test_blackd_main(self) -> None:
  22         with patch("blackd.web.run_app"):
  23             result = CliRunner().invoke(blackd.main, [])
  24             if result.exception is not None:
  25                 raise result.exception
  26             self.assertEqual(result.exit_code, 0)
  27
  28     async def get_application(self) -> web.Application:
  29         return blackd.make_app()
  30
  31     @unittest_run_loop
  32     async def test_blackd_request_needs_formatting(self) -> None:
  33         response = await self.client.post("/", data=b"print('hello world')")
  34         self.assertEqual(response.status, 200)
  35         self.assertEqual(response.charset, "utf8")
  36         self.assertEqual(await response.read(), b'print("hello world")\n')
  37
  38     @unittest_run_loop
  39     async def test_blackd_request_no_change(self) -> None:
  40         response = await self.client.post("/", data=b'print("hello world")\n')
  41         self.assertEqual(response.status, 204)
  42         self.assertEqual(await response.read(), b"")
  43
  44     @unittest_run_loop
  45     async def test_blackd_request_syntax_error(self) -> None:
  46         response = await self.client.post("/", data=b"what even ( is")
  47         self.assertEqual(response.status, 400)
  48         content = await response.text()
  49         self.assertTrue(
  50             content.startswith("Cannot parse"),
  51             msg=f"Expected error to start with 'Cannot parse', got {repr(content)}",
  52         )
  53
  54     @unittest_run_loop
  55     async def test_blackd_unsupported_version(self) -> None:
  56         response = await self.client.post(
  57             "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "2"}
  58         )
  59         self.assertEqual(response.status, 501)
  60
  61     @unittest_run_loop
  62     async def test_blackd_supported_version(self) -> None:
  63         response = await self.client.post(
  64             "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "1"}
  65         )
  66         self.assertEqual(response.status, 200)
  67
  68     @unittest_run_loop
  69     async def test_blackd_invalid_python_variant(self) -> None:
  70         async def check(header_value: str, expected_status: int = 400) -> None:
  71             response = await self.client.post(
  72                 "/", data=b"what", headers={blackd.PYTHON_VARIANT_HEADER: header_value}
  73             )
  74             self.assertEqual(response.status, expected_status)
  75
  76         await check("lol")
  77         await check("ruby3.5")
  78         await check("pyi3.6")
  79         await check("py1.5")
  80         await check("2.8")
  81         await check("py2.8")
  82         await check("3.0")
  83         await check("pypy3.0")
  84         await check("jython3.4")
  85
  86     @unittest_run_loop
  87     async def test_blackd_pyi(self) -> None:
  88         source, expected = read_data("stub.pyi")
  89         response = await self.client.post(
  90             "/", data=source, headers={blackd.PYTHON_VARIANT_HEADER: "pyi"}
  91         )
  92         self.assertEqual(response.status, 200)
  93         self.assertEqual(await response.text(), expected)
  94
  95     @unittest_run_loop
  96     async def test_blackd_diff(self) -> None:
  97         diff_header = re.compile(
  98             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"
  99         )
 100
 101         source, _ = read_data("blackd_diff.py")
 102         expected, _ = read_data("blackd_diff.diff")
 103
 104         response = await self.client.post(
 105             "/", data=source, headers={blackd.DIFF_HEADER: "true"}
 106         )
 107         self.assertEqual(response.status, 200)
 108
 109         actual = await response.text()
 110         actual = diff_header.sub(DETERMINISTIC_HEADER, actual)
 111         self.assertEqual(actual, expected)
 112
 113     @unittest_run_loop
 114     async def test_blackd_python_variant(self) -> None:
 115         code = (
 116             "def f(\n"
 117             "    and_has_a_bunch_of,\n"
 118             "    very_long_arguments_too,\n"
 119             "    and_lots_of_them_as_well_lol,\n"
 120             "    **and_very_long_keyword_arguments\n"
 121             "):\n"
 122             "    pass\n"
 123         )
 124
 125         async def check(header_value: str, expected_status: int) -> None:
 126             response = await self.client.post(
 127                 "/", data=code, headers={blackd.PYTHON_VARIANT_HEADER: header_value}
 128             )
 129             self.assertEqual(
 130                 response.status, expected_status, msg=await response.text()
 131             )
 132
 133         await check("3.6", 200)
 134         await check("py3.6", 200)
 135         await check("3.6,3.7", 200)
 136         await check("3.6,py3.7", 200)
 137         await check("py36,py37", 200)
 138         await check("36", 200)
 139         await check("3.6.4", 200)
 140
 141         await check("2", 204)
 142         await check("2.7", 204)
 143         await check("py2.7", 204)
 144         await check("3.4", 204)
 145         await check("py3.4", 204)
 146         await check("py34,py36", 204)
 147         await check("34", 204)
 148
 149     @unittest_run_loop
 150     async def test_blackd_line_length(self) -> None:
 151         response = await self.client.post(
 152             "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "7"}
 153         )
 154         self.assertEqual(response.status, 200)
 155
 156     @unittest_run_loop
 157     async def test_blackd_invalid_line_length(self) -> None:
 158         response = await self.client.post(
 159             "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "NaN"}
 160         )
 161         self.assertEqual(response.status, 400)
 162
 163     @unittest_run_loop
 164     async def test_blackd_response_black_version_header(self) -> None:
 165         response = await self.client.post("/")
 166         self.assertIsNotNone(response.headers.get(blackd.BLACK_VERSION_HEADER))
 167
 168     @unittest_run_loop
 169     async def test_cors_preflight(self) -> None:
 170         response = await self.client.options(
 171             "/",
 172             headers={
 173                 "Access-Control-Request-Method": "POST",
 174                 "Origin": "*",
 175                 "Access-Control-Request-Headers": "Content-Type",
 176             },
 177         )
 178         self.assertEqual(response.status, 200)
 179         self.assertIsNotNone(response.headers.get("Access-Control-Allow-Origin"))
 180         self.assertIsNotNone(response.headers.get("Access-Control-Allow-Headers"))
 181         self.assertIsNotNone(response.headers.get("Access-Control-Allow-Methods"))
 182
 183     @unittest_run_loop
 184     async def test_cors_headers_present(self) -> None:
 185         response = await self.client.post("/", headers={"Origin": "*"})
 186         self.assertIsNotNone(response.headers.get("Access-Control-Allow-Origin"))
 187         self.assertIsNotNone(response.headers.get("Access-Control-Expose-Headers"))