PYTHON-3337 Fix capped collection test on MMAPv1 (#990)

Author: ShaneHarvey

test/unified-test-format/valid-pass/collectionData-createOptions.json

@@ -34,7 +34,7 @@
       "databaseName": "database0",
       "createOptions": {
         "capped": true,
-        "size": 512
+        "size": 4096
       },
       "documents": [
         {
@@ -60,7 +60,7 @@
           },
           "expectResult": {
             "capped": true,
-            "maxSize": 512
+            "maxSize": 4096
           }
         }
       ]

test/unified_format.py

@@ -880,6 +880,10 @@ def maybe_skip_test(self, spec):
         class_name = self.__class__.__name__.lower()
         description = spec["description"].lower()
         if "csot" in class_name:
+            if client_context.storage_engine == "mmapv1":
+                self.skipTest(
+                    "MMAPv1 does not support retryable writes which is required for CSOT tests"
+                )
             if "change" in description or "change" in class_name:
                 self.skipTest("CSOT not implemented for watch()")
             if "cursors" in class_name: