Expect correct error to be raised

Before, there was not actually a message for `push_code`,
so `raise_unauthorized` would be called with a `nil` argument and the
expectation would be met if any error was raised.

ee/spec/lib/gitlab/git_access_spec.rb

@@ -253,16 +253,16 @@ describe Gitlab::GitAccess do
     let(:actor) { :geo }
 
     it { expect { pull_changes }.not_to raise_error }
-    it { expect { push_changes }.to raise_unauthorized(Gitlab::GitAccess::ERROR_MESSAGES[:push_code]) }
+    it { expect { push_changes }.to raise_unauthorized(Gitlab::GitAccess::ERROR_MESSAGES[:upload]) }
   end
 
   private
 
-  def push_changes(changes = Gitlab::GitAccess::ANY)
+  def push_changes(changes = '_any')
     access.check('git-receive-pack', changes)
   end
 
-  def pull_changes(changes = Gitlab::GitAccess::ANY)
+  def pull_changes(changes = '_any')
     access.check('git-upload-pack', changes)
   end