Add unit test for raw clause parsing

[hanneskaeufler]

This was a bit of fiddling but this exercises the currently uncovered branch as seen here: https://coveralls.io/builds/13692274/source?filename=src%2FCachedBuilder.php#L93

Fixes issue #17

[coveralls]

Coverage increased (+0.7%) to 98.561% when pulling af9d8ea on hanneskaeufler:hk-issue-17 into b7a3cc6 on GeneaLabs:master.

[hanneskaeufler]

Scrutinizer failure looked unrelated, so I force pushed to retrigger.

[mikebronner]

@hanneskaeufler Woohoo! :) Thanks for working on this :) It appears the unit tests are failing. Yea, I restarted Scrutinizer, and it passed. Will wait for them to finish, will then merge. Keep the TDD magic going! :)

[coveralls]

Coverage increased (+0.7%) to 98.561% when pulling 73de75f on hanneskaeufler:hk-issue-17 into b7a3cc6 on GeneaLabs:master.

[hanneskaeufler]

Hehe, my pleasure, love me some testing and I almost got nostalgic about php after a few years of no php work lol 💟

[mikebronner]

@hanneskaeufler Make sure you register for Hactoberfest, and if you do the other 3 issues (each as its own pull request), you will already be eligible for your t-shirt! :)

https://hacktoberfest.digitalocean.com