@Test public void nemesisAddressesAreValid() { // Arrange: final Block block = this.loadNemesisBlock(); // Act: final Set<Address> allAddresses = block .getTransactions() .stream() .flatMap(t -> t.getAccounts().stream().map(Account::getAddress)) .collect(Collectors.toSet()); // Assert: for (final Address address : allAddresses) { Assert.assertThat(address.toString(), address.isValid(), IsEqual.equalTo(true)); } }