code: def test_invalid_tau1():
      with pytest.raises(
          nx.NetworkXError, match="tau2 must be greater than one"
      ):
          n = 100
          tau1 = 2
          tau2 = 1
          mu = 0.1
          nx.LFR_benchmark_graph(n, tau1, tau2, mu, min_degree=2)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 11 for calling a global function with example usage: test_invalid_tau1() without return types