see

tox.ini

@@ -13,4 +13,4 @@ deps =
     pytest
 commands =
     python setup.py --quiet clean develop
-    pytest
+    pytest -s

userpath/interface.py

@@ -81,6 +81,7 @@ def __init__(self, shells=None, all_shells=False, home=None):
             shells = DEFAULT_SHELLS
 
         # De-dup and retain order
+        print(shells)
         deduplicated_shells = set()
         selected_shells = []
         for shell in shells:
@@ -96,16 +97,19 @@ def detect_shell(cls):
         # First, try to see what spawned this process
         shell = get_parent_process_name().lower()
         if shell in SHELLS:
+            print('proc')
             return shell
 
         # Then, search for environment variables that are known to be set by certain shells
         # NOTE: This likely does not work when not directly in the shell
         if 'BASH_VERSION' in os.environ:
+            print('env')
             return 'bash'
 
         # Finally, try global environment
         shell = os.path.basename(os.environ.get('SHELL', '')).lower()
         if shell in SHELLS:
+            print('global')
             return shell
 
     def location_in_new_path(self, location):
@@ -140,7 +144,8 @@ def put(self, location, front=True, app_name=None):
 
                     with open(file, 'w', encoding='utf-8') as f:
                         f.writelines(lines)
-                except Exception:
+                except Exception as e:
+                    print(e)
                     continue
 
         return self.location_in_new_path(location)