WalletUtils { public static String getDefaultKeyDirectory() { return getDefaultKeyDirectory(System.getProperty("os.name")); }  static String generateWalletFile(
            String password, File destinationDirectory); static String generateWalletFile(
            String password, ECKeyPair ecKeyPair, File destinationDirectory); static String generateWalletFile(NEP6Wallet nep6Wallet, File destinationDirectory); static String getWalletFileName(NEP6Wallet nep6Wallet); static String getDefaultKeyDirectory();  }
@Test public void testGetDefaultKeyDirectory() { assertTrue(WalletUtils.getDefaultKeyDirectory("Mac OS X") .endsWith(String.format("%sLibrary%sneow3j", File.separator, File.separator))); assertTrue(WalletUtils.getDefaultKeyDirectory("Windows") .endsWith(String.format("%sneow3j", File.separator))); assertTrue(WalletUtils.getDefaultKeyDirectory("Linux") .endsWith(String.format("%s.neow3j", File.separator))); }