Currently the test and the related test library
query_settings_index_hints_tests.js has the following problems:
 - a lot of code duplication
 - non-transparent assertions (what are we testing?)
 - 'non-atomic' tests testing many things at once (see the previous point)
 
Ideas for improvement:
 - separate the tests when possible
   * fallback tests
   * query settings index application tests
   * $natural tests
   * query settings + index hints tests
   * ...
 - introduce view dimension as crossProduct([view, non-view], [view, non-view])
 - use the same name for view and non-view to simplify the test methods
 - consider forcing cacheing single-solution plans in classic