Caio Lima

It adds tests to cases reported on #2947

We are missing some coverage on class features proposals: 1. Test cases that uses private methods/accessors on prefix & postfix nodes. 2. Tests with partially initialized objects with private fields,...

ICU-20926 Adding test to verify fallback rule of DateIntervalFormat

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##### Checklist - [x] Issue filed: https://unicode-org.atlassian.net/browse/ICU-20926 - [x] Updated PR title and link in previous line to include Issue number - [x] Issue accepted - [x] Tests included -...