@Test
    @SuppressWarnings("PMD.JUnitTestsShouldIncludeAssert") // is done in called test method
    public void simple() throws Exception {
        final Date d = FORMATTER.parse("2022-04-06");
        assertSingle(c -> c.setHidden(d), dd -> dd.setMinMaxDate(d, d), true);
    }
This class tests the Date filters, using HIDDEN filter as an example
main/src/androidTest/java/cgeo/geocaching/filters/DateRangeGeocacheFilterTest.java