Various improvements possible in mocha test cases

[S McDowall]

1 -- There appear to be 3 duplicate tests in test.js
https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L182
https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L239

https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L198
https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L255

https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L219
https://github.com/sjmcdowall/hydra/blob/master/specs/test.js#L276

2 -- Inconsistent use of @description vs. @summary

3 -- No code coverage report appears to be generated. This could be a good thing to see?

[Carlos Justiniano]

Cut and paste no doubt. PR?

[S McDowall]

Fixed by #180