Vendor LoggingFixture

This was removed from fixtures recently [1]. While it has been re-added
[2], the fixture is small enough that we can just vendor it here.

A future change will make fixtures a hard requirement of our test suite,
since that's trivially doable now that we no longer package our tests.

[1] testing-cabal/fixtures#114
[2] testing-cabal/fixtures#122

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

tests/test_fixturesupport.py

@@ -20,10 +20,23 @@
 except ImportError:
     fixtures = None  # type: ignore
 
-try:
-    from fixtures.tests.helpers import LoggingFixture
-except ImportError:
-    LoggingFixture = None
+if fixtures:
+
+    class LoggingFixture(fixtures.Fixture):
+        def __init__(self, suffix: str = "", calls: list[str] | None = None) -> None:
+            super().__init__()
+            if calls is None:
+                calls = []
+            self.calls = calls
+            self.suffix = suffix
+
+        def setUp(self) -> None:
+            super().setUp()
+            self.calls.append("setUp" + self.suffix)
+            self.addCleanup(self.calls.append, "cleanUp" + self.suffix)
+
+        def reset(self) -> None:
+            self.calls.append("reset" + self.suffix)
 
 
 class TestFixtureSupport(TestCase):