[Rails5] `xhr` and `xml_http_request` are deprecated
DEPRECATION WARNING: `xhr` and `xml_http_request` are deprecated and will be removed in Rails 5.1.
Switch to e.g. `post :create, params: { comment: { body: 'Honey bunny' } }, xhr: true`.
% find spec -name '*_spec.rb' | xargs grep -r 'xhr :'
spec/controllers/groups/group_members_controller_spec.rb: xhr :put, :update, group_member: { access_level: value },
spec/controllers/groups/group_members_controller_spec.rb: xhr :delete, :destroy, group_id: group, id: member
spec/controllers/projects/issues_controller_spec.rb: xhr :get,
spec/controllers/projects/project_members_controller_spec.rb: xhr :put, :update, project_member: { access_level: value },
spec/controllers/projects/project_members_controller_spec.rb: xhr :delete, :destroy, namespace_id: project.namespace,
spec/controllers/projects/merge_requests_controller_spec.rb: xhr :post, :merge, params: base_params
spec/controllers/projects/merge_requests_controller_spec.rb: xhr :post, :remove_wip,
spec/controllers/projects/merge_requests_controller_spec.rb: xhr :post, :cancel_merge_when_pipeline_succeeds,
spec/controllers/projects/refs_controller_spec.rb: xhr :get,