tests: Order the 'attributes' object keys, for less noisy diffs
tests: Order the 'attributes' object keys, for less noisy diffs

Change-Id: I0e5a320860c1fd2c3d528e192fe1ff951dae3d1a

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui