def deploy_service_registry_and_set_urls(
    private_keys, web3, contract_manager, service_registry_address
) -> Tuple[ServiceRegistry, List[str]]:
    urls = ["http://foo", "http://boo", "http://coo"]
    c1_client = JSONRPCClient(web3, private_keys[0])
    c1_service_proxy = ServiceRegistry(
        jsonrpc_client=c1_client,
        service_registry_address=service_registry_address,
        contract_manager=contract_manager,
    )
    c2_client = JSONRPCClient(web3, private_keys[1])
    c2_service_proxy = ServiceRegistry(
        jsonrpc_client=c2_client,
        service_registry_address=service_registry_address,
        contract_manager=contract_manager,
    )
    c3_client = JSONRPCClient(web3, private_keys[2])
    c3_service_proxy = ServiceRegistry(
        jsonrpc_client=c3_client,
        service_registry_address=service_registry_address,
        contract_manager=contract_manager,
    )

    # Test that getting a random service for an empty registry returns None
    pfs_address = get_random_service(c1_service_proxy, "latest")
    assert pfs_address is None

    # Test that setting the urls works
    c1_service_proxy.set_url(urls[0])
    c2_service_proxy.set_url(urls[1])
    c3_service_proxy.set_url(urls[2])

    return c1_service_proxy, urls
def _contour(ax, title, elements, values, label='', isa=None):
    from matplotlib.patches import Polygon
    from matplotlib.collections import PatchCollection
    if ax == 0:
        ax = plt.gca()
    ax.set_aspect('equal')
    ax.set_title(title, fontsize=18)
    if isa:
        for se in isa.superelements:
            ax.add_patch(Polygon([n.xy
                                  for nc in se.nodechains
                                  for n in nc.nodes],
                                 color='gray', alpha=0.1, lw=0))
    valid_values = np.logical_not(np.isnan(values))
    patches = np.array([Polygon([v.xy for v in e.vertices])
                       for e in elements])[valid_values]
    # , cmap=matplotlib.cm.jet, alpha=0.4)
    p = PatchCollection(patches, alpha=1.0, match_original=False)
    p.set_array(np.asarray(values)[valid_values])
    ax.add_collection(p)
    cb = plt.colorbar(p)
    for patch in np.array([Polygon([v.xy for v in e.vertices],
                                   fc='white', alpha=1.0)
                           for e in elements])[np.isnan(values)]:
        ax.add_patch(patch)
    if label:
        cb.set_label(label=label, fontsize=18)
    ax.autoscale(enable=True)
    ax.axis('off')