Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/networkx/readwrite/tests/test_yaml.py

@@ -0,0 +1,50 @@
+"""
+    Unit tests for yaml.
+"""
+
+import os
+import tempfile
+import pytest
+
+yaml = pytest.importorskip("yaml")
+
+import networkx as nx
+from networkx.testing import assert_edges_equal, assert_nodes_equal
+
+
+class TestYaml:
+    @classmethod
+    def setup_class(cls):
+        cls.build_graphs()
+
+    @classmethod
+    def build_graphs(cls):
+        cls.G = nx.Graph(name="test")
+        e = [("a", "b"), ("b", "c"), ("c", "d"), ("d", "e"), ("e", "f"), ("a", "f")]
+        cls.G.add_edges_from(e)
+        cls.G.add_node("g")
+
+        cls.DG = nx.DiGraph(cls.G)
+
+        cls.MG = nx.MultiGraph()
+        cls.MG.add_weighted_edges_from([(1, 2, 5), (1, 2, 5), (1, 2, 1), (3, 3, 42)])
+
+    def assert_equal(self, G, data=False):
+        (fd, fname) = tempfile.mkstemp()
+        nx.write_yaml(G, fname)
+        Gin = nx.read_yaml(fname)
+
+        assert_nodes_equal(list(G), list(Gin))
+        assert_edges_equal(G.edges(data=data), Gin.edges(data=data))
+
+        os.close(fd)
+        os.unlink(fname)
+
+    def testUndirected(self):
+        self.assert_equal(self.G, data=False)
+
+    def testDirected(self):
+        self.assert_equal(self.DG, data=False)
+
+    def testMultiGraph(self):
+        self.assert_equal(self.MG, data=True)