[jboss-jira] [JBoss JIRA] (DROOLS-1760) Enhance test coverage of FEEL built-in functions part 2

Enhance test coverage of FEEL built-in functions part 2 ------------------------------------------------------- Key: DROOLS-1760 URL: https://issues.jboss.org/browse/DROOLS-1760 Project: Drools Issue Type: Enhancement Components: dmn engine Affects Versions: 7.4.0.Final Reporter: Tibor Zimányi Assignee: Tibor Zimányi Fix For: 7.5.0.Final Add unit test coverage for function classes: - SortFunction - SubstringFunction - SumFunction - TimeFunction - TodayFunction - UnionFunction - YearsAndMonthFunction