TST: xfail for GH pandas-dev#18480

Author: toobaz

pandas/tests/series/test_constructors.py

@@ -658,6 +658,16 @@ def test_constructor_tuple_of_tuples(self):
         s = Series(data)
         assert tuple(s) == data
 
+    @pytest.mark.xfail(reason='GH 18480 (Series initialization from dict with '
+                              'NaN keys')
+    def test_constructor_dict_of_tuples(self):
+        data = {(1, 2): 3,
+                (None, 5): 6}
+        result = Series(data).sort_values()
+        expected = Series([3, 6],
+                          index=MultiIndex.from_tuples([(1, 2), (None, 5)]))
+        tm.assert_series_equal(result, expected)
+
     def test_constructor_set(self):
         values = set([1, 2, 3, 4, 5])
         pytest.raises(TypeError, Series, values)