### Question:
RegionAddressGenerator { String getRegionPrefix() { return encode(regionPrefix); } RegionAddressGenerator(CountryRegion region); long newAddress(); boolean isAddressFromRegion(long address);  }### Answer:
@Test public void testRegionPrefix() { assertEquals("rohd", rohd.getRegionPrefix()); assertEquals("gblnd", gblnd.getRegionPrefix()); assertEquals("ied", ied.getRegionPrefix()); }