refactor: remove unused test class setting

unittest_mixins would check that files got created if a test made a
temporary directory, so that we could trim down making temp dirs
needlessly.

But we don't use unittest_mixins any more, so this setting does nothing.
Remove it.

1 files changed, 0 insertions, 4 deletions

diff --git a/tests/test_coverage.py b/tests/test_coverage.py
index 30a8edc5..6cec3dd7 100644
--- a/tests/test_coverage.py
+++ b/tests/test_coverage.py
@@ -1849,10 +1849,6 @@ class ModuleTest(CoverageTest):
 class ReportingTest(CoverageTest):
     """Tests of some reporting behavior."""
 
-    # We don't make any temporary files, but we need an empty directory to run
-    # the tests in.
-    no_files_in_temp_dir = True
-
     def test_no_data_to_report_on_annotate(self):
         # Reporting with no data produces a nice message and no output
         # directory.