writing tests for middleware example changed (#2496)
writing tests for middleware example changed (#2496)

* writing tests for middleware example changed, #559

* note about mock impls

* backticks to single quotes

* better first test

* semi

* back ticks around `create`

roth1002/redux,gaearon/redux,gaearon/redux,CompuIves/redux,CompuIves/redux,roth1002/redux