class_docstr: Tests for :func:`networkx.algorithms.min_edge_cover`
class_docstr_tok: ["Tests","for",":","func",":","`","networkx.algorithms.min_edge_cover","`"]
code: def test_graph_with_isolated_v(self):
      G = nx.Graph()
      G.add_node(1)
      with pytest.raises(
          nx.NetworkXException,
          match="Graph has a node with no edge incident on it, so no edge cover exists.",
      ):
          nx.min_edge_cover(G)
  
file_path: networkx/networkx/algorithms/tests/test_covering.py
imports: import pytest
  import networkx
label_desc: Use image node_id 3 for calling the TestMinEdgeCover obj's underlying member method code with example usage: obj.test_graph_with_isolated_v() without return types