@Test
public void testGetDefaultKeyDirectory() {

    assertTrue(WalletUtils.getDefaultKeyDirectory("Mac OS X")
            .endsWith(String.format("%sLibrary%sEthereum", File.separator, File.separator)));
    assertTrue(WalletUtils.getDefaultKeyDirectory("Windows")
            .endsWith(String.format("%sEthereum", File.separator)));
    assertTrue(WalletUtils.getDefaultKeyDirectory("Linux")
            .endsWith(String.format("%s.ethereum", File.separator)));
}