LPS-44476 SearchResultUtil: introduce tests to document current behavior

Hi @brianchandotcom!

This is https://github.com/brianchandotcom/liferay-portal/pull/19135#issuecomment-46107563 with an extra commit bringing it up to the standards introduced by https://github.com/brianchandotcom/liferay-portal/commit/c0cd4ac2ca11030cb026bcd793d341bdfe870ae2 and https://github.com/brianchandotcom/liferay-portal/pull/19595#issue-36805870. The same single, consistent style is now honored across all tests.

Thanks again for your input!!