def pytest_addoption(parser):
    parser.addoption( "--ref", action="store", type=str, help='specifies address of reference node')
    parser.addoption( "--test", action="store", type=str, help='specifies address of tested service')
    parser.addoption( "--start", action="store", type=int, default=4900000, help='specifies block range start')
    parser.addoption( "--stop", action="store", type=int, default=4925000, help='specifies block range stop')
