def test_shear(self):
        t = TreeNode.read(io.StringIO('((H:1,G:1):2,(R:0.5,M:0.7):3);'))
        obs = str(t.shear(['G', 'M']))
        exp = '(G:3.0,M:3.7);\n'
        self.assertEqual(obs, exp)
fetches the response of a simple xml-based webservice. If node is
dataset/ETHPy150Open biocore/scikit-bio/skbio/tree/tests/test_tree.py/TreeTests.test_shear--crossover with--dataset/ETHPy150Open ckreutzer/python-tvrage/tvrage/feeds.py/_fetch_xml