This replaces usage of `should` by `expect` according to the following
deprecation warning.
Using `should` from rspec-expectations' old `:should` syntax without
explicitly enabling the syntax is deprecated. Use the new `:expect`
syntax or explicitly enable `:should` with
`config.expect_with(:rspec) { |c| c.syntax = :should }`
instead.
Change-Id: Ifaac60ea93a5f854cd70929d7f3f5308a9b9911e
2f27c84684