Local test failure is observed with German Locale

LocalDateTimeStringConverterTest.testChronologyConsistency, top of failure trace

org.junit.ComparisonFailure: expected:<...y, January 12, 60 Sh[ō]wa, 12:34:56 PM> but was:<...y, January 12, 60 Sh[o]wa, 12:34:56 PM>
    at org.junit.Assert.assertEquals(Assert.java:123)
    at org.junit.Assert.assertEquals(Assert.java:145)
    at test.javafx.util.converter.LocalDateTimeStringConverterTest.testChronologyConsistency(LocalDateTimeStringConverterTest.java:160)

It looks like some problem with assumptions of Locale-dependent state.