ddt.py源码中的mk_test_name函数是用来生成测试用例名字的
参数：name、value、index
name为单元测试中，测试用例的名字。即test_api
value为测试数据。ddt是处理一组测试数据。而这个value就是这一组数据中的每一个测试数据
对value的值是有限制的：要么就是单值变量，要么就是元组或者列表并且要求元组和列表中的数据都是单值变量。如("name","port") 、["name","port"]
index：用例数量
ddt源码中针对index设置了最大值index_len，默认为5，如果用例数大于5，需要修改该值
mk_test_name函数源码：
def mk_test_name(name, value, index=0): """ Generate a new name for a test case. It will take the original test name and append an ordinal index and a string representation of the value, and convert the result into a valid python identifier by replacing extraneous characters with ``_``. We avoid doing str(value) if dealing with non-trivial values. The problem is possible different names with different runs, e.g. different order of dictionary keys (see PYTHONHASHSEED) or dealing with mock objects. Trivial scalar values are passed as is. A "trivial" value is a plain scalar, or a tuple or list consisting only of trivial values. """ # Add zeros before index to keep order index = "{0:0{1}}".format(index + 1, index_len) if not is_trivial(value): return "{0}_{1}".format(name, index)try: value = str(value) except UnicodeEncodeError: # fallback for python2 value = value.encode('ascii', 'backslashreplace') test_name = "{0}_{1}_{2}".format(name, index, value) return re.sub(r'W|^(?=d)', '_', test_name)
修改后（）：
def mk_test_name(name, value, index=0): """ Generate a new name for a test case. It will take the original test name and append an ordinal index and a string representation of the value, and convert the result into a valid python identifier by replacing extraneous characters with ``_``. We avoid doing str(value) if dealing with non-trivial values. The problem is possible different names with different runs, e.g. different order of dictionary keys (see PYTHONHASHSEED) or dealing with mock objects. Trivial scalar values are passed as is. A "trivial" value is a plain scalar, or a tuple or list consisting only of trivial values. """ # Add zeros before index to keep order index = "{0:0{1}}".format(index + 1, index_len) if not is_trivial(value): # 如果不符合value的要求，则直接返回用例名称_下标作为最终测试用例名字。 return "{0}_{1}".format(name, index) # 如果数据是list，则获取字典当中第一个数据作为测试用例名称 if type(value) is list: try: value = value[0] except: return "{0}_{1}".format(name, index) try: value = str(value) except UnicodeEncodeError: # fallback for python2 value = value.encode('ascii', 'backslashreplace') test_name = "{0}_{1}_{2}".format(name, index, value) return re.sub(r'W|^(?=d)', '_', test_name)
修改后执行结果：
