Mark thread-unsafe test as single-CPU-only

Author: kernc

pandas/tests/sparse/series/test_series.py

@@ -484,6 +484,7 @@ def test_get_get_value(self):
             tm.assert_almost_equal(
                 self.bseries.get_value(10), self.bseries[10])
 
+    @pytest.mark.single
     def test_set_value(self):
 
         idx = self.btseries.index[7]