add more tests

Author: WolframAlph

Lib/test/test_peepholer.py

@@ -1441,6 +1441,19 @@ def test_fold_constant_intrinsic_list_to_tuple(self):
         ]
         self.cfg_optimization_test(before, after, consts=[], expected_consts=[(1, 2, 3)])
 
+        # no sequence start
+        same = [
+            ('LOAD_SMALL_INT', 1, 0),
+            ('LIST_APPEND', 1, 0),
+            ('LOAD_SMALL_INT', 2, 0),
+            ('LIST_APPEND', 1, 0),
+            ('LOAD_SMALL_INT', 3, 0),
+            ('LIST_APPEND', 1, 0),
+            ('CALL_INTRINSIC_1', INTRINSIC_LIST_TO_TUPLE, 0),
+            ('RETURN_VALUE', None, 0)
+        ]
+        self.cfg_optimization_test(same, same, consts=[])
+
     def test_optimize_if_const_list(self):
         before = [
             ('NOP', None, 0),