def test_all_fake(self): self.assertEqual(list_elements('aa,bb,cc,dd',atomic_symbols),[])
def test_random(self): self.assertEqual(list_elements('h,br,aa,li',atomic_symbols),['h','br','li'])
def test_sulfuric_acid(self): self.assertEqual(list_elements('h,s,o',atomic_symbols),['h','s','o'])
def test_all_fake(self): self.assertEqual(list_elements('aa,bb,cc,dd', atomic_symbols), [])
def test_random(self): self.assertEqual(list_elements('h,br,aa,li', atomic_symbols), ['h', 'br', 'li'])
def test_sulfuric_acid(self): self.assertEqual(list_elements('h,s,o', atomic_symbols), ['h', 's', 'o'])