Extract code from `Namespace#clean_path` for ghost user generation.

1. Create a `Uniquify` class, which generalizes the process of generating unique
   strings, by accepting a function that defines what "uniqueness" means in a
   given context.

2. WIP: Make sure tests for `Namespace` pass, add more if necessary.

3. WIP: Add tests for `Uniquify`

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 00e7927bf90..861d338ef95 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -1513,7 +1513,7 @@ describe User, models: true do
         ghost = User.ghost
 
         expect(ghost).to be_persisted
-        expect(ghost.username).to eq('ghost0')
+        expect(ghost.username).to eq('ghost1')
       end
     end
 
@@ -1523,7 +1523,7 @@ describe User, models: true do
         ghost = User.ghost
 
         expect(ghost).to be_persisted
-        expect(ghost.email).to eq('ghost0@example.com')
+        expect(ghost.email).to eq('ghost1@example.com')
       end
     end
   end