ENH: Test for xml (de)serialization.

tests/test_xmlparsing.py

@@ -5,6 +5,8 @@
 #
 # Copyright (C) 2018 Research Group Biomedical Physics,
 # Max-Planck-Institute for Dynamics and Self-Organization Göttingen
+# Copyright (C) 2023 Indiscale GmbH <info@indiscale.com>
+# Copyright (C) 2023 Daniel Hornung <d.hornung@indiscale.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
@@ -25,9 +27,20 @@
 
 @author: tf
 """
+
+import os
+import warnings
+
+import caosdb as db
 import pytest
 
 
+def teardown_function(function):
+    d = db.execute_query("FIND Test*")
+    if len(d) > 0:
+        d.delete()
+
+
 @pytest.mark.local_server
 def test_parse_xml():
     from lxml import etree
@@ -120,3 +133,27 @@ def test_parse_xml():
         assert isinstance(msg, Message)
         assert_equal(msg.type.lower(), tmp_msg_type.lower())
         assert_equal(msg.body, tmp_msg_body)
+
+
+def test_container_xml(tmp_path):
+    """Test if after writing to xml, the result can be read without problems.
+
+For issue 89: https://gitlab.com/caosdb/caosdb-pylib/-/issues/89
+"""
+    with warnings.catch_warnings():
+
+        # Create XML with container with one RecordType.
+        db.RecordType(name="TestRT").insert()
+        cont = db.execute_query("FIND RecordType TestRT")
+        xml_file = os.path.join(tmp_path, "tmp.xml")
+        with open(xml_file, "w", encoding="utf-8") as opened:
+            opened.write(str(cont))
+
+        # Read from file again.
+        with open(xml_file, "r", encoding="utf-8") as opened:
+            xml_str = opened.read()
+        cont_restored = db.Container.from_xml(xml_str)
+
+        # Test if the serialization and deserialization worked.
+        assert cont[0].id == cont_restored[0].id
+        assert cont[0].name == cont_restored[0].name