Add test for MVR read-write round-trip

Author: vanous

.gitignore

@@ -9,3 +9,4 @@ devel/
 *whl
 *.mvr
 uv.lock
+mvr-spec

tests/test_read_write_round_trip.py

@@ -0,0 +1,51 @@
+# MIT License
+#
+# Copyright (C) 2025 vanous
+#
+# This file is part of pymvr.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import pytest
+import os
+from pathlib import Path
+
+
+def test_read_write_round_trip(request, pymvr_module):
+    # tests a single file, reading and then exporting
+    # does not pack resources, only the XML
+    # uv run pytest --file-path=/path/to/file.mvr -s -x
+    file_path = request.config.getoption("--file-path")
+
+    if file_path is None:
+        pytest.skip("File path not provided")
+    file_read_path = Path(file_path)
+    if not file_read_path.is_file():
+        pytest.skip("File does not exist")
+    file_read_dir = file_read_path.parent
+    file_read_name = file_read_path.stem
+    file_write_path = Path(file_read_dir, f"{file_read_name}_exported.mvr")
+
+    with pymvr_module.GeneralSceneDescription(file_read_path) as mvr_read:
+        mvr_writer = pymvr_module.GeneralSceneDescriptionWriter()
+
+        mvr_read.scene.to_xml(parent=mvr_writer.xml_root)
+        mvr_read.user_data.to_xml(parent=mvr_writer.xml_root)
+
+        mvr_writer.write_mvr(file_write_path)

tests/test_with_files.py renamed to tests/test_reading_with_many_files.py

@@ -27,7 +27,7 @@
 from pathlib import Path
 
 
-def test_with_file(request, pymvr_module):
+def test_reading_with_many_files(request, pymvr_module):
     # uv run pytest --file-path=../../gdtfs/ -s
     file_path = request.config.getoption("--file-path")