Major fixes and new features

venv/lib/python3.12/site-packages/mypy/test/testfinegrainedcache.py

@@ -0,0 +1,18 @@
+"""Tests for fine-grained incremental checking using the cache.
+
+All of the real code for this lives in testfinegrained.py.
+"""
+
+# We can't "import FineGrainedSuite from ..." because that will cause pytest
+# to collect the non-caching tests when running this file.
+from __future__ import annotations
+
+import mypy.test.testfinegrained
+
+
+class FineGrainedCacheSuite(mypy.test.testfinegrained.FineGrainedSuite):
+    use_cache = True
+    test_name_suffix = "_cached"
+    files = mypy.test.testfinegrained.FineGrainedSuite.files + [
+        "fine-grained-cache-incremental.test"
+    ]