Fix ChangeStreamBatchCursorSpecification.groovy

Author: rozza

driver-core/src/test/resources/unified-test-format/valid-pass/poc-command-monitoring.json

@@ -58,6 +58,7 @@
   "tests": [
     {
       "description": "A successful find event with a getmore and the server kills the cursor (<= 4.4)",
+      "comment": "UPDATED final batchSize to 3 as batchSize is no longer calculated see: DRIVERS-1448 ",
       "runOnRequirements": [
         {
           "minServerVersion": "3.1",
@@ -150,7 +151,7 @@
                     ]
                   },
                   "collection": "test",
-                  "batchSize": 1
+                  "batchSize": 3
                 },
                 "commandName": "getMore",
                 "databaseName": "command-monitoring-tests"

driver-core/src/test/unit/com/mongodb/internal/operation/ChangeStreamBatchCursorSpecification.groovy

@@ -21,6 +21,8 @@ import org.bson.BsonDocument
 import org.bson.BsonInt32
 import spock.lang.Specification
 
+import static java.util.Collections.emptyList
+
 class ChangeStreamBatchCursorSpecification extends Specification {
 
     def 'should call the underlying CommandBatchCursor'() {
@@ -49,7 +51,7 @@ class ChangeStreamBatchCursorSpecification extends Specification {
         cursor.next()
 
         then:
-        1 * wrapped.next()
+        1 * wrapped.next() >> emptyList()
         1 * wrapped.getPostBatchResumeToken()
 
         when: