How to configure completion match case setting in unit tests?

I'm writting unit tests for code completion features, but when I debugged to MinusculeMatcherImpl#isFirstCharMatching:

if (myOptions == NameUtil.MatchingCaseSensitivity.FIRST_LETTER &&
    (patternIndex == 0 || patternIndex == 1 && isWildcard(0)) &&
    hasCase(patternChar) &&
    Character.isUpperCase(patternChar) != Character.isUpperCase(name.charAt(0))) {
  return false;
}

It seems that Match case setting of Code Completion is set to "First letter only" by default.

It takes me some time to debug but I still don't know how to set it to "None" in my tests.  I will be thankful for any advice.