def test1(self): self.assertEqual(extract_subset_id(None), "None")
def test1(self): self.assertEqual(extract_subset_id(8), "8")
def test3(self): self.assertEqual(extract_subset_id("4"), "4")
def test1(self): self.assertEqual(extract_subset_id("12"), "12")
def test2(self): self.assertEqual(extract_subset_id("41-3"), "41")