test: add transaction rollback test

test/test_api_rql.py

@@ -141,6 +141,38 @@
         assert isinstance(response[2][0][0], int)
         assert isinstance(response[2][0][1], int)
 
+    def test_rollback_on_error(self):
+        self.login_request()
+        queries = [
+            {
+                "query": "INSERT CWUser U: U login %(login)s, U upassword 'AZJEJAZO'",
+                "params": {"login": "ginger"},
+            },
+            {
+                "query": "SET U in_group G WHERE U eid 'test'",
+                "params": {},
+            },
+        ]
+        response = self.make_rql_request(queries, status=400)
+
+        assert response == {
+            "data": None,
+            "message": "781 (in_group-subject): at least one relation in_group is "
+            "required on CWUser (781)",
+            "title": "ValidationError",
+        }
+
+        # Check user not added, request should be rolled back
+        queries = [
+            {
+                "query": "Any X WHERE X login %(login)s",
+                "params": {"login": "ginger"},
+            },
+        ]
+        response = self.make_rql_request(queries, status=200)
+
+        assert response == [[]]
+
     def test_400_on_invalid_transactions(self):
         queries = [
             {