Tweak a unit test by allowing a different type of exception to be raised

lib/spack/spack/test/concretize_requirements.py

@@ -14,7 +14,7 @@
 import spack.repo
 import spack.util.spack_yaml as syaml
 import spack.version
-from spack.solver.asp import UnsatisfiableSpecError
+from spack.solver.asp import InternalConcretizerError, UnsatisfiableSpecError
 from spack.spec import Spec
 from spack.util.url import path_to_file_url
 
@@ -716,7 +716,8 @@ def test_incompatible_virtual_requirements_raise(concretize_scope, mock_packages
     update_packages_config(conf_str)
 
     spec = Spec("callpath ^zmpi")
-    with pytest.raises(UnsatisfiableSpecError):
+    # TODO (multiple nodes): recover a better error message later
+    with pytest.raises((UnsatisfiableSpecError, InternalConcretizerError)):
         spec.concretize()