Fix failing unit test

gramps/cli/user.py

@@ -58,6 +58,7 @@ class User(user.User):
         user.User.__init__(self, callback, error)
         self.steps = 0;
         self.current_step = 0;
+        self._input = input
 
         def yes(*args): 
             return True
@@ -135,7 +136,7 @@ class User(user.User):
                 n = reject_label)
         print (text, file = self._fileout) # TODO python3 add flush=True
         try:
-            reply = input()
+            reply = self._input()
             return reply == "" or reply == accept_label
         except EOFError:
             return False