make test_config::test_set_gmxrc_environment skippable

Author: orbeckst

tests/test_config.py

@@ -33,7 +33,9 @@ def GMXRC():
     bindir = os.path.dirname(path)
     GMXRC = os.path.join(bindir, "GMXRC")
     if not os.path.exists(GMXRC):
-        raise IOError(errno.ENOENT, "Could not find Gromacs setup file", GMXRC)
+        # return None if GMXRC is not available so that we can skip the test
+        # (needed for test in deployment workflow)
+        return None
     return GMXRC
 
 
@@ -49,6 +51,8 @@ def temp_environ():
 
 def test_set_gmxrc_environment(GMXRC):
     # not threadsafe: function modifies the global process environment
+    if GMXRC is None:
+        pytest.skip("GMXRC not available (GROMACS may still be installed)")
 
     gmx_envvars = (
         "GMXBIN",