@Test
public void testCheckGrpcUrlInvalid() {

    // Test a number of invalid variations
    Assert.assertNotNull(Utils.checkGrpcUrl("http://hyperledger.org:1234"));
    Assert.assertNotNull(Utils.checkGrpcUrl("grpc://hyperledger.org"));
    Assert.assertNotNull("grpc://hyperledger.org:1234/index.html");
}