repo_type_spec fails for undefined method wiki for group

Job #570214960 failed for 8e7b434e:

rspec './spec/lib/gitlab/gl_repository/repo_type_spec.rb[1:2:4:1:3:1]'

   1) Gitlab::GlRepository::RepoType#<Gitlab::GlRepository::RepoType:0x000055a9bf6bdcd0> group wiki behaves like a repo type #repository_for finds the repository for the repo type
      Failure/Error: repository_resolver: -> (container) { container&.wiki&.repository },
      NoMethodError:
        undefined method `wiki' for #<Group id:3094 @group241>
      Shared Example Group: "a repo type" called from ./spec/lib/gitlab/gl_repository/repo_type_spec.rb:74
      # ./vendor/ruby/2.6.0/gems/activemodel-6.0.3/lib/active_model/attribute_methods.rb:432:in `method_missing'
      # ./lib/gitlab/gl_repository.rb:15:in `block in <class:GlRepository>'
      # ./lib/gitlab/gl_repository/repo_type.rb:60:in `repository_for'
      # ./spec/support/shared_examples/lib/gitlab/repo_type_shared_examples.rb:18:in `block (3 levels) in <top (required)>'
      # ./vendor/ruby/2.6.0/gems/rspec-core-3.9.1/lib/rspec/core/example.rb:257:in `instance_exec'
      # ./vendor/ruby/2.6.0/gems/rspec-core-3.9.1/lib/rspec/core/example.rb:257:in `block in run'
      # ./vendor/ruby/2.6.0/gems/rspec-core-3.9.1/lib/rspec/core/example.rb:503:in `block in with_around_and_singleton_context_hooks'
      # ./vendor/ruby/2.6.0/gems/rspec-core-3.9.1/lib/rspec/core/example.rb:460:in `block in with_around_example_hooks'
      # ./vendor/ruby/2.6.0/gems/rspec-core-3.9.1/lib/rspec/core/hooks.rb:472:in `block in run'