@Test
public void testIsValidAddress() {

    assertTrue(isValidAddress(SampleKeys.ADDRESS));
    assertTrue(isValidAddress(SampleKeys.ADDRESS_NO_PREFIX));
    assertFalse(isValidAddress(""));
    assertFalse(isValidAddress(SampleKeys.ADDRESS + 'a'));
    assertFalse(isValidAddress(SampleKeys.ADDRESS.substring(1)));
}