Add unit test for findPossibleValues method of Concept Class

I am adding a unit test for previously un-tested method findPossibleValues from Concept class, However the assertion I use to test fails.

Based on my understanding, this assertion should not fail.

see here in my local fork the unit test in question: ConceptTest class method findPossibleValues_shouldReturnListOfConceptsFromMatchingResults

https://github.com/astorga2/openmrs-core/commit/77c9a1f4f1bcff53f1fd37b43102d19067d628f5

the output message I get is:
Failed tests:
ConceptTest.findPossibleValues_shouldReturnListOfConceptsFromMatchingResults:12
01 expected:<[1]> but was:<[]>