设置主要功能测试的命令行参数 [英] Setting command line arguments for main function tests
问题描述
我在python中有一个main()函数来获取命令行参数. 我有办法为此功能编写pytest测试并在代码中定义参数吗?
I have a main() function in python that gets command line arguments. Is there a way for me to write pytest tests for this function and define the arguments in the code?
例如
def main():
# argparse code
args, other = arg_parser.parse_known_args()
return args.first_arg
def test_main():
res = main() # call with first_arg = "abc"
assert(res == "abc")
推荐答案
parse_args
采用argv
参数.文档在示例中反复使用了
parse_args
takes a argv
parameter. The docs uses this repeatedly in it's examples
parser = argparse.ArgumentParser()
parser.add_argument('--foo', action='store_true')
parser.add_argument('bar')
parser.parse_known_args(['--foo', '--badger', 'BAR', 'spam'])
字符串列表复制从命令行获取的sys.argv[1:]
.如果参数为None
(或省略),则解析器使用sys.argv[1:]
.
where the string list replicates sys.argv[1:]
that it would get from the commandline. If the argument is None
(or omitted) the parser uses sys.argv[1:]
.
如果
def main(argv=None):
# argparse code
args, other = arg_parser.parse_known_args(argv)
return args.first_arg
您可以使用
main(['foo', '-f','v'])
argparse.py
的unittesting
文件使用这种方法,也可以直接修改sys.argv
.
The unittesting
file for argparse.py
uses both this approach, and your's of modifying sys.argv
directly.
https://docs.python.org/3/library/argparse.html#beyond-sys-argv
https://docs.python.org/3/library/argparse.html#partial-parsing
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