bpo-30917: IDLE: Add config.IdleConf unittests (#2691)

Patch by Louie Lu.

Author: mlouielu

Lib/idlelib/config.py

@@ -30,6 +30,7 @@
 import sys
 
 from tkinter.font import Font
+import idlelib
 
 class InvalidConfigType(Exception): pass
 class InvalidConfigSet(Exception): pass
@@ -159,14 +160,15 @@ class IdleConf:
  for config_type in self.config_types:
  (user home dir)/.idlerc/config-{config-type}.cfg
  """
- def __init__(self):
+ def __init__(self, _utest=False):
  self.config_types = ('main', 'highlight', 'keys', 'extensions')
  self.defaultCfg = {}
  self.userCfg = {}
  self.cfg = {} # TODO use to select userCfg vs defaultCfg
- self.CreateConfigHandlers()
- self.LoadCfgFiles()
 
+ if not _utest:
+ self.CreateConfigHandlers()
+ self.LoadCfgFiles()
 
  def CreateConfigHandlers(self):
  "Populate default and user config parser dictionaries."
@@ -215,7 +217,8 @@ def GetUserCfgDir(self):
  except OSError:
  warn = ('\n Warning: unable to create user config directory\n' +
  userDir + '\n Check path and permissions.\n Exiting!\n')
- print(warn, file=sys.stderr)
+ if not idlelib.testing:
+ print(warn, file=sys.stderr)
  raise SystemExit
  # TODO continue without userDIr instead of exit
  return userDir
@@ -463,16 +466,7 @@ def GetExtensions(self, active_only=True,
 
  def RemoveKeyBindNames(self, extnNameList):
  "Return extnNameList with keybinding section names removed."
- # TODO Easier to return filtered copy with list comp
- names = extnNameList
- kbNameIndicies = []
- for name in names:
- if name.endswith(('_bindings', '_cfgBindings')):
- kbNameIndicies.append(names.index(name))
- kbNameIndicies.sort(reverse=True)
- for index in kbNameIndicies: #delete each keybinding section name
- del(names[index])
- return names
+ return [n for n in extnNameList if not n.endswith(('_bindings', '_cfgBindings'))]
 
  def GetExtnNameForEvent(self, virtualEvent):
  """Return the name of the extension binding virtualEvent, or None.