测试脚本的编写 — 软件工程选择题

某待测函数 normalize(s) 的约定是：去除字符串首尾空白，并将其转换为小写。使用 pytest 编写脚本验证输入 " Qa " 得到 "qa"，下列哪项正确？ A. def test_normalize(): assert normalize(" Qa ") == "qa" B. def test_normalize(): assert normalize(" Qa ") = "qa" C. def test_normalize(): assert normalize(" Qa ") == " qa " D. def test_normalize(): normalize(" Qa ") == "qa"