Add autotest on issue 5501 (#3980)

test_regression/helpers/meshlib_helpers.py

@@ -46,6 +46,11 @@ def compare_meshes_similarity(mesh1: mrmeshpy.Mesh, mesh2: mrmeshpy.Mesh,
     :param verts_thresh: vertices difference threshold
     :param skip_volume: skip volume check - for open meshes
     """
+    if isinstance(mesh1, str) or isinstance(mesh1, Path):
+        mesh1 = mrmeshpy.loadMesh(str(mesh1))
+    if isinstance(mesh2, str) or isinstance(mesh2, Path):
+        mesh2 = mrmeshpy.loadMesh(str(mesh2))
+
     with check:
         #  check on meshes relative Hausdorff distance
         rhsdr = relative_hausdorff(mesh1, mesh2)

test_regression/test_issues/test_issue_5501.py

@@ -0,0 +1,32 @@
+import io
+from pathlib import Path
+
+import meshlib.mrmeshpy as mm
+import pytest
+from constants import test_files_path
+from helpers.meshlib_helpers import compare_meshes_similarity
+
+
+@pytest.mark.smoke
+@pytest.mark.bindingsV3
+def test_issue_5501_read(tmp_path):
+    input_folder = Path(test_files_path) / "issues" / "5501"
+    in_file = input_folder / "input.ctm"
+    with open(in_file, "rb") as file_handler:
+        buf = io.BytesIO(file_handler.read())
+        mrmesh = mm.loadMesh(buf, "*.ctm")
+        mm.saveMesh(mrmesh, tmp_path / "out_read.ctm")
+    compare_meshes_similarity(in_file,  tmp_path / "out_read.ctm")
+
+@pytest.mark.smoke
+@pytest.mark.bindingsV3
+def test_issue_2899_write(tmp_path):
+    input_folder = Path(test_files_path) / "issues" / "5501"
+    in_file = input_folder / "input.ctm"
+    mrmesh = mm.loadMesh(in_file)
+    with io.BytesIO() as byte_stream:
+        mm.saveMesh(mrmesh, out=byte_stream, extension="*.ctm")
+        with open(tmp_path / "out_write.ctm", "wb") as f:
+            f.write(byte_stream.getbuffer())
+
+    compare_meshes_similarity(in_file, tmp_path / "out_write.ctm")