diff --git a/spanner/tests/system/test_system.py b/spanner/tests/system/test_system.py
index 65ee553806ff..858887e78679 100644
--- a/spanner/tests/system/test_system.py
+++ b/spanner/tests/system/test_system.py
@@ -641,7 +641,42 @@ def _generate_insert_statements(self):
 
     @RetryErrors(exception=exceptions.ServerError)
     @RetryErrors(exception=exceptions.Conflict)
-    def test_transaction_execute_sql_w_dml_read_commit(self):
+    def test_transaction_execute_sql_w_dml_read_rollback(self):
+        retry = RetryInstanceState(_has_all_ddl)
+        retry(self._db.reload)()
+
+        session = self._db.session()
+        session.create()
+        self.to_delete.append(session)
+
+        with session.batch() as batch:
+            batch.delete(self.TABLE, self.ALL)
+
+        transaction = session.transaction()
+        transaction.begin()
+
+        rows = list(
+            transaction.read(self.TABLE, self.COLUMNS, self.ALL))
+        self.assertEqual(rows, [])
+
+        for insert_statement in self._generate_insert_statements():
+            result = transaction.execute_sql(insert_statement)
+            list(result)  # iterate to get stats
+            self.assertEqual(result.stats.row_count_exact, 1)
+
+        # Rows inserted via DML *can* be read before commit.
+        during_rows = list(
+            transaction.read(self.TABLE, self.COLUMNS, self.ALL))
+        self._check_rows_data(during_rows)
+
+        transaction.rollback()
+
+        rows = list(session.read(self.TABLE, self.COLUMNS, self.ALL))
+        self._check_rows_data(rows, [])
+
+    @RetryErrors(exception=exceptions.ServerError)
+    @RetryErrors(exception=exceptions.Conflict)
+    def test_transaction_execute_update_read_commit(self):
         retry = RetryInstanceState(_has_all_ddl)
         retry(self._db.reload)()
 
@@ -657,9 +692,8 @@ def test_transaction_execute_sql_w_dml_read_commit(self):
             self.assertEqual(rows, [])
 
             for insert_statement in self._generate_insert_statements():
-                result = transaction.execute_sql(insert_statement)
-                list(result)  # iterate to get stats
-                self.assertEqual(result.stats.row_count_exact, 1)
+                result = transaction.execute_update(insert_statement)
+                self.assertEqual(result.row_count_exact, 1)
 
             # Rows inserted via DML *can* be read before commit.
             during_rows = list(
@@ -671,7 +705,7 @@ def test_transaction_execute_sql_w_dml_read_commit(self):
 
     @RetryErrors(exception=exceptions.ServerError)
     @RetryErrors(exception=exceptions.Conflict)
-    def test_transaction_execute_update_read_commit(self):
+    def test_transaction_execute_update_then_insert_commit(self):
         retry = RetryInstanceState(_has_all_ddl)
         retry(self._db.reload)()
 
@@ -682,18 +716,16 @@ def test_transaction_execute_update_read_commit(self):
         with session.batch() as batch:
             batch.delete(self.TABLE, self.ALL)
 
+        insert_statement = list(self._generate_insert_statements())[0]
+
         with session.transaction() as transaction:
             rows = list(transaction.read(self.TABLE, self.COLUMNS, self.ALL))
             self.assertEqual(rows, [])
 
-            for insert_statement in self._generate_insert_statements():
-                result = transaction.execute_update(insert_statement)
-                self.assertEqual(result.row_count_exact, 1)
+            result = transaction.execute_update(insert_statement)
+            self.assertEqual(result.row_count_exact, 1)
 
-            # Rows inserted via DML *can* be read before commit.
-            during_rows = list(
-                transaction.read(self.TABLE, self.COLUMNS, self.ALL))
-            self._check_rows_data(during_rows)
+            transaction.insert(self.TABLE, self.COLUMNS, self.ROW_DATA[1:])
 
         rows = list(session.read(self.TABLE, self.COLUMNS, self.ALL))
         self._check_rows_data(rows)