X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/e401b6bb1e1c0ed534bba59d9dc908caf7ba898c..1a20c4d4874f912822f6a42cb61816330a4f6508:/tests/test_blackd.py

diff --git a/tests/test_blackd.py b/tests/test_blackd.py
index 37431fc..511bd86 100644
--- a/tests/test_blackd.py
+++ b/tests/test_blackd.py
@@ -1,23 +1,37 @@
 import re
+from typing import TYPE_CHECKING, Any, Callable, TypeVar
 from unittest.mock import patch
 
-from click.testing import CliRunner
 import pytest
+from click.testing import CliRunner
 
-from tests.util import read_data, DETERMINISTIC_HEADER
+from tests.util import DETERMINISTIC_HEADER, read_data
 
 try:
-    import blackd
-    from aiohttp.test_utils import AioHTTPTestCase, unittest_run_loop
     from aiohttp import web
-except ImportError:
-    has_blackd_deps = False
+    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:
-    has_blackd_deps = True
+    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):
+class BlackDTestCase(AioHTTPTestCase):  # type: ignore[misc]
     def test_blackd_main(self) -> None:
         with patch("blackd.web.run_app"):
             result = CliRunner().invoke(blackd.main, [])
@@ -69,7 +83,9 @@ class BlackDTestCase(AioHTTPTestCase):
     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}
+                "/",
+                data=b"what",
+                headers={blackd.PYTHON_VARIANT_HEADER: header_value},
             )
             self.assertEqual(response.status, expected_status)
 
@@ -88,7 +104,7 @@ class BlackDTestCase(AioHTTPTestCase):
 
     @unittest_run_loop
     async def test_blackd_pyi(self) -> None:
-        source, expected = read_data("stub.pyi")
+        source, expected = read_data("miscellaneous", "stub.pyi")
         response = await self.client.post(
             "/", data=source, headers={blackd.PYTHON_VARIANT_HEADER: "pyi"}
         )
@@ -101,8 +117,8 @@ class BlackDTestCase(AioHTTPTestCase):
             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("blackd_diff.py")
-        expected, _ = read_data("blackd_diff.diff")
+        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"}
@@ -155,10 +171,19 @@ class BlackDTestCase(AioHTTPTestCase):
     @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"}
+            "/",
+            data=b'print("hello")\n',
+            headers={blackd.LINE_LENGTH_HEADER: "NaN"},
         )
         self.assertEqual(response.status, 400)
 
+    @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("/")