diff --git a/tests/core.py b/tests/core.py
index 330926f..2a3da6d 100644
--- a/tests/core.py
+++ b/tests/core.py
@@ -38,9 +38,9 @@ def validate(self) -> None:
         assert result.rowcount == 4
         row = result.first()
         if self.target.config.get("add_record_metadata", True):
-            assert len(row) == 8
+            assert len(row) == 8, f"Row has unexpected length {len(row)}"
         else:
-            assert len(row) == 2
+            assert len(row) == 2, f"Row has unexpected length {len(row)}"
 
         assert row[1] == '[\n  "apple",\n  "orange",\n  "pear"\n]'
         table_schema = connector.get_table(table)
@@ -85,6 +85,7 @@ def validate(self) -> None:
             "_sdc_batched_at": sct.TIMESTAMP_NTZ,
             "_sdc_received_at": sct.TIMESTAMP_NTZ,
             "_sdc_deleted_at": sct.TIMESTAMP_NTZ,
+            "_sdc_sync_started_at": sct.NUMBER,
             "_sdc_table_version": sct.NUMBER,
             "_sdc_sequence": sct.NUMBER,
         }
@@ -237,9 +238,9 @@ def validate(self) -> None:
             assert result.rowcount == 2
             row = result.first()
             if self.target.config.get("add_record_metadata", True):
-                assert len(row) == 7
+                assert len(row) == 7, f"Row has unexpected length {len(row)}"
             else:
-                assert len(row) == 1
+                assert len(row) == 1, f"Row has unexpected length {len(row)}"
 
             table_schema = connector.get_table(table)
             expected_types = {
@@ -271,9 +272,9 @@ def validate(self) -> None:
         row = result.first()
 
         if self.target.config.get("add_record_metadata", True):
-            assert len(row) == 13
+            assert len(row) == 13, f"Row has unexpected length {len(row)}"
         else:
-            assert len(row) == 7
+            assert len(row) == 7, f"Row has unexpected length {len(row)}"
 
         table_schema = connector.get_table(table)
         expected_types = {
@@ -317,7 +318,7 @@ def validate(self) -> None:
         )
         assert result.rowcount == 2
         row = result.first()
-        assert len(row) == 11
+        assert len(row) == 11, f"Row has unexpected length {len(row)}"
 
 
 class SnowflakeTargetReservedWordsNoKeyProps(TargetFileTestTemplate):
@@ -339,7 +340,7 @@ def validate(self) -> None:
         )
         assert result.rowcount == 1
         row = result.first()
-        assert len(row) == 10
+        assert len(row) == 10, f"Row has unexpected length {len(row)}"
 
 
 class SnowflakeTargetColonsInColName(TargetFileTestTemplate):
@@ -358,7 +359,7 @@ def validate(self) -> None:
         )
         assert result.rowcount == 1
         row = result.first()
-        assert len(row) == 11
+        assert len(row) == 12, f"Row has unexpected length {len(row)}"
         table_schema = connector.get_table(table)
         assert {column.name for column in table_schema.columns} == {
             "FOO::BAR",
@@ -370,6 +371,7 @@ def validate(self) -> None:
             "_sdc_batched_at",
             "_sdc_received_at",
             "_sdc_deleted_at",
+            "_sdc_sync_started_at",
             "_sdc_table_version",
             "_sdc_sequence",
         }
@@ -414,7 +416,7 @@ def validate(self) -> None:
         )
         assert result.rowcount == 1
         row = result.first()
-        assert len(row) == 12
+        assert len(row) == 12, f"Row has unexpected length {len(row)}"
 
 
 class SnowflakeTargetExistingTableAlter(SnowflakeTargetExistingTable):
@@ -466,6 +468,7 @@ def validate(self) -> None:
             "_sdc_batched_at": sct.TIMESTAMP_NTZ,
             "_sdc_received_at": sct.TIMESTAMP_NTZ,
             "_sdc_deleted_at": sct.TIMESTAMP_NTZ,
+            "_sdc_sync_started_at": sct.NUMBER,
             "_sdc_table_version": sct.NUMBER,
             "_sdc_sequence": sct.NUMBER,
         }