diff --git a/tests/100_extras2.py b/tests/100_extras2.py
deleted file mode 100644
index 659e03f2..00000000
--- a/tests/100_extras2.py
+++ /dev/null
@@ -1,94 +0,0 @@
-''' 
-========= src/common/algorithm.c =========
-'''
-
-# 该函数的return false没有被覆盖
-# bool c11__stable_sort(void* ptr_,
-#                       int length,
-#                       int elem_size,
-#                       int (*f_lt)(const void* a, const void* b, void* extra),
-#                       void* extra) {
-#     // merge sort
-#     char *ptr = ptr_, *tmp = PK_MALLOC(length * elem_size);
-#     for(int seg = 1; seg < length; seg *= 2) {
-#         for(char* a = ptr; a < ptr + (length - seg) * elem_size; a += 2 * seg * elem_size) {
-#             char *b = a + seg * elem_size, *a_end = b, *b_end = b + seg * elem_size;
-#             if(b_end > ptr + length * elem_size) b_end = ptr + length * elem_size;
-#             bool ok = _stable_sort_merge(a, a_end, b, b_end, tmp, elem_size, f_lt, extra);
-#             if(!ok) {
-#                 PK_FREE(tmp);
-# ---->           return false;  
-#             }
-#             memcpy(a, tmp, b_end - a);
-#         }
-#     }
-#     PK_FREE(tmp);
-#     return true;
-# }
-
-
-# 调查得知只要触发bool ok = pk_stack_binaryop(vm, __lt__, __gt__)的return false即可
-# bool pk_stack_binaryop(VM* self, py_Name op, py_Name rop) {
-#     // [a, b]
-#     py_Ref magic = py_tpfindmagic(SECOND()->type, op);
-#     if(magic) {
-#         bool ok = py_call(magic, 2, SECOND());
-# ---->   if(!ok) return false;
-#         if(self->last_retval.type != tp_NotImplementedType) return true;
-#     }
-#     // try reverse operation
-#     if(rop) {
-#         // [a, b] -> [b, a]
-#         py_TValue tmp = *TOP();
-#         *TOP() = *SECOND();
-#         *SECOND() = tmp;
-#         magic = py_tpfindmagic(SECOND()->type, rop);
-#         if(magic) {
-#             bool ok = py_call(magic, 2, SECOND());
-# ---->       if(!ok) return false;
-#             if(self->last_retval.type != tp_NotImplementedType) return true;
-#         }
-#     }
-#     // eq/ne op never fails
-#     bool res = py_isidentical(SECOND(), TOP());
-#     if(op == __eq__) {
-#         py_newbool(py_retval(), res);
-#         return true;
-#     }
-#     if(op == __ne__) {
-#         py_newbool(py_retval(), !res);
-#         return true;
-#     }
-
-#     py_Type lhs_t = rop ? TOP()->type : SECOND()->type;
-#     py_Type rhs_t = rop ? SECOND()->type : TOP()->type;
-#     return TypeError("unsupported operand type(s) for '%s': '%t' and '%t'",
-#                      pk_op2str(op),
-#                      lhs_t,
-#                      rhs_t);
-# }
-
-# 
-# 调查得知只要触发bool ok = py_call(py_tpfindmagic(SECOND()->type, __lt__/__gt__), 2, SECOND())的return false即可
-# bool py_call(py_Ref f, int argc, py_Ref argv) {
-#     if(f->type == tp_nativefunc) {
-#         return py_callcfunc(f->_cfunc, argc, argv);
-#     } else {
-#         py_push(f);
-#         py_pushnil();
-#         for(int i = 0; i < argc; i++)
-#             py_push(py_offset(argv, i));
-#         bool ok = py_vectorcall(argc, 0);
-#         return ok;
-#     }
-# }
-
-class A():
-    def __lt__(self, other:int=1):
-        return True
-
-
-try:
-    [A(), 1111].sort()
-except TypeError:
-    pass
\ No newline at end of file