Run idxml tests only if pyopenms is installed

Author: RalfG

.github/workflows/test.yml

@@ -58,7 +58,11 @@ jobs:
       - name: Install package and its dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install .[dev,idxml]
+          pip install .[dev]
+
+      - name: Install optional dependencies that might not be available
+        continue-on-error: true
+        run: pip install .[idxml]
 
       - name: Test imports
         run: python -c "import psm_utils"

tests/test_io/test_idxml.py

@@ -2,11 +2,15 @@
 
 import hashlib
 
+import pytest
+
 from psm_utils.io.idxml import IdXMLReader, IdXMLWriter
 from psm_utils.io.sage import SageTSVReader
 from psm_utils.peptidoform import Peptidoform
 from psm_utils.psm import PSM
 
+pyopenms = pytest.importorskip("pyopenms")
+
 
 class TestIdXMLReader:
     def test__parse_peptidoform(self):