private void assertSingle(final Action1<Geocache> cacheSetter, final Action1<DifficultyGeocacheFilter> filterSetter, final Boolean expectedResult) {
        GeocacheFilterTestUtils.testSingle(GeocacheFilterType.DIFFICULTY, cacheSetter, filterSetter, expectedResult);
    }
This class tests the number range filters, using DIFFICULTY filter as an example
main/src/androidTest/java/cgeo/geocaching/filters/NumberRangeGeocacheFilterTest.java