Fix writevtk: pass str to write_data fn

pymech/vtksuite.py

@@ -1,4 +1,5 @@
 """Module for converting :class:`pymech.core.HexaData` objects to vtk"""
+import os
 from itertools import product
 from pathlib import Path
 
@@ -188,8 +189,9 @@ def writevtk(fname, data):
     """
     ext = ".vtp"
     fname = Path(fname)
-    if not fname.suffix != ext:
+    if fname.suffix != ext:
+        logger.info(f"Renaming {fname} with extension .vtp")
         fname = fname.with_suffix(ext)
 
     vtk_dataset = exa2vtk(data)
-    write_data(vtk_dataset, fname)
+    write_data(vtk_dataset, os.fspath(fname))

tests/test_vtk.py

@@ -1,4 +1,5 @@
 """Tests experimental vtksuite"""
+from pathlib import Path
 import pytest
 
 try:
@@ -13,11 +14,12 @@
     not TVTK_INSTALLED, reason="Package mayavi / tvtk is not installed "
 )
 @pytest.mark.parametrize("downsample", (True, False))
-def test_writevtk(test_data_dir, downsample):
+def test_writevtk(downsample, test_data_dir, tmpdir):
     from pymech import readnek
     from pymech.vtksuite import writevtk
 
-    fname = f"{test_data_dir}/nek/channel3D_0.f00001"
-    field = readnek(fname)
-    writevtk(fname, field)
-    assert fname.with_suffix(".vtp").exists()
+    in_fname = Path(test_data_dir) / "nek" / "channel3D_0.f00001"
+    out_fname = Path(tmpdir / in_fname.name)
+    field = readnek(in_fname)
+    writevtk(out_fname, field)
+    assert out_fname.with_suffix(".vtp").exists()