import pytest

import networkx as nx


def test_smetric():
    g = nx.Graph()
    g.add_edge(1, 2)
    g.add_edge(2, 3)
    g.add_edge(2, 4)
    g.add_edge(1, 4)
    sm = nx.s_metric(g, normalized=False)
    assert sm == 19.0
#    smNorm = nx.s_metric(g,normalized=True)
#    assert_equal(smNorm, 0.95)


def test_normalized():
    with pytest.raises(nx.NetworkXError):
        sm = nx.s_metric(nx.Graph(), normalized=True)