windows started passing, but linux failing; one quick check to see if…

… logging.info helps:

pyomo/contrib/iis/tests/test_mis.py

@@ -79,24 +79,31 @@ def _test_mis(solver_name):
     opt = pyo.SolverFactory(solver_name)
 
     # This test seems to fail on Windows as it unlinks the tempfile, so live with it
-    try:
+    #    On a Windows machine, we will not use a temp dir and just try to delete the log file
+    if os.name == "nt":
+        print("we have nt")
+        file_name = f"{solver_name}_mis.log"
+        logger = logging.getLogger(f"test_mis_{solver_name}")
+        fh = logging.FileHandler(file_name)
+        fh.setLevel(logging.DEBUG)
+        logger.addHandler(fh)
+
+        mis.compute_infeasibility_explanation(m, opt, logger=logger)
+        _check_output(file_name)
+
+    else:  # not windows
         with TempfileManager.new_context() as tmpmgr:
-            print("start")
             tmp_path = tmpmgr.mkdtemp()
             file_name = os.path.join(tmp_path, f"{solver_name}_mis.log")
             logger = logging.getLogger(f"test_mis_{solver_name}")
-            ###logger.setLevel(logging.INFO)
-            # create file handler which logs even debug messages
+            logger.setlevel(logging.INFO)
             fh = logging.FileHandler(file_name)
             fh.setLevel(logging.DEBUG)
             logger.addHandler(fh)
 
             mis.compute_infeasibility_explanation(m, opt, logger=logger)
             _check_output(file_name)
 
-    except PermissionError:
-        print("PerimssionError allowed for log file during test (Windows)")
-
 
 if __name__ == "__main__":
     unittest.main()