Fix RSpec "have" deprecation warnings

* Remove redundant assertions (there is no need to check the size of the
  "subject" when another assertion is implicitly validating the size by
  ensuring all of the elements are correct/expected)
* Ensure consistent formatting of test[ing] code
Merge pull request #1 from jzaleski/jwz-fix-test-deprecation-warnings

Fix RSpec "have" deprecation warnings