def test_series_intersection_b(self):
# create a series from a single value
idxa = IndexGO(('a', 'b', 'c'))
idxb = IndexGO(('b', 'c', 'd'))
self.assertEqual(idxa.intersection(idxb).values.tolist(), ['b', 'c'])
self.assertEqual(
idxa.union(idxb).values.tolist(), ['a', 'b', 'c', 'd'])
def test_index_union_a(self) -> None:
idx1 = IndexGO(('a', 'b', 'c', 'd', 'e'))
idx1.append('f')
a1 = np.array(['c', 'dd', 'b', 'a'])
idx2 = idx1.union(a1)
self.assertEqual(idx2.values.tolist(),
['a', 'b', 'c', 'd', 'dd', 'e', 'f'])
