PYTHON-2548 Add update description.truncated arrays field (#572)

(cherry picked from commit 4088c1c)

Author: prashantmital

test/change_streams/change-streams-errors.json renamed to test/change_streams/legacy/change-streams-errors.json

@@ -0,0 +1,116 @@
+{
+  "description": "change-streams",
+  "schemaVersion": "1.0",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0"
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "database0"
+      }
+    },
+    {
+      "collection": {
+        "id": "collection0",
+        "database": "database0",
+        "collectionName": "collection0"
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "collection0",
+      "databaseName": "database0",
+      "documents": []
+    }
+  ],
+  "tests": [
+    {
+      "description": "Test array truncation",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.7",
+          "topologies": [
+            "replicaset"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 1,
+              "a": 1,
+              "array": [
+                "foo",
+                {
+                  "a": "bar"
+                },
+                1,
+                2,
+                3
+              ]
+            }
+          }
+        },
+        {
+          "name": "createChangeStream",
+          "object": "collection0",
+          "arguments": {
+            "pipeline": []
+          },
+          "saveResultAsEntity": "changeStream0"
+        },
+        {
+          "name": "updateOne",
+          "object": "collection0",
+          "arguments": {
+            "filter": {
+              "_id": 1
+            },
+            "update": [
+              {
+                "$set": {
+                  "array": [
+                    "foo",
+                    {
+                      "a": "bar"
+                    }
+                  ]
+                }
+              }
+            ]
+          }
+        },
+        {
+          "name": "iterateUntilDocumentOrError",
+          "object": "changeStream0",
+          "expectResult": {
+            "operationType": "update",
+            "ns": {
+              "db": "database0",
+              "coll": "collection0"
+            },
+            "updateDescription": {
+              "updatedFields": {},
+              "removedFields": [],
+              "truncatedArrays": [
+                {
+                  "field": "array",
+                  "newSize": 2
+                }
+              ]
+            }
+          }
+        }
+      ]
+    }
+  ]
+}

test/change_streams/change-streams-resume-errorLabels.json renamed to test/change_streams/legacy/change-streams-resume-errorLabels.json

@@ -45,6 +45,7 @@
 from pymongo.write_concern import WriteConcern
 
 from test import client_context, unittest, IntegrationTest
+from test.unified_format import generate_test_classes
 from test.utils import (
     EventListener, WhiteListEventListener, rs_or_single_client, wait_until)
 
@@ -1039,7 +1040,7 @@ def test_read_concern(self):
             pass
 
 
-class TestAllScenarios(unittest.TestCase):
+class TestAllLegacyScenarios(unittest.TestCase):
 
     @classmethod
     @client_context.require_connection
@@ -1122,8 +1123,7 @@ def tearDown(self):
 
 
 _TEST_PATH = os.path.join(
-    os.path.dirname(os.path.realpath(__file__)), 'change_streams'
-)
+    os.path.dirname(os.path.realpath(__file__)), 'change_streams')
 
 
 def camel_to_snake(camel):
@@ -1217,7 +1217,7 @@ def run_scenario(self):
 
 
 def create_tests():
-    for dirpath, _, filenames in os.walk(_TEST_PATH):
+    for dirpath, _, filenames in os.walk(os.path.join(_TEST_PATH, 'legacy')):
         dirname = os.path.split(dirpath)[-1]
 
         for filename in filenames:
@@ -1253,11 +1253,16 @@ def create_tests():
                     str(test['description'].replace(" ", "_")))
 
                 new_test.__name__ = test_name
-                setattr(TestAllScenarios, new_test.__name__, new_test)
+                setattr(TestAllLegacyScenarios, new_test.__name__, new_test)
 
 
 create_tests()
 
 
+globals().update(generate_test_classes(
+    os.path.join(_TEST_PATH, 'unified'),
+    module=__name__,))
+
+
 if __name__ == '__main__':
     unittest.main()