python - 如何为 python 提示工具包创建单元测试？

Question

我想为我的命令行界面创建单元测试使用 Python prompt-toolkit ( https://github.com/jonathanslenders/python-prompt-toolkit ) 构建。

• 如何使用提示工具包模拟用户交互？
• 这些单元测试是否有最佳实践？

示例代码:

from os import path
from prompt_toolkit import prompt

def csv():
    csv_path = prompt('\nselect csv> ')
    full_path = path.abspath(csv_path)
    return full_path

Answer 1

你可以 mock提示调用。

应用文件

from prompt_toolkit import prompt

def word():
    result = prompt('type a word')
    return result

test_app_file

import unittest
from app import word
from mock import patch

class TestAnswer(unittest.TestCase):
    def test_yes(self):
        with patch('app.prompt', return_value='Python') as prompt:
            self.assertEqual(word(), 'Python')
            prompt.assert_called_once_with('type a word')

if __name__ == '__main__':
    unittest.main()

请注意，您应该从 app.py 中模拟提示，而不是从 prompt_toolkit 中模拟提示，因为您想拦截来自文件的调用。

根据docstring module :

If you are using this library for retrieving some input from the user (as a pure Python replacement for GNU readline), probably for 90% of the use cases, the :func:.prompt function is all you need.

作为method docstring说:

Get input from the user and return it. This is a wrapper around a lot of prompt_toolkit functionality and can be a replacement for raw_input. (or GNU readline.)

在 Getting started 之后来自项目:

>>> from prompt_toolkit import prompt
>>> answer = prompt('Give me some input: ')
Give me some input: Hello World
>>> print(answer)
'Hello World'
>>> type(answer)
<class 'str'>

由于 prompt 方法返回字符串类型，您可以使用 mock.return_value 来模拟用户与您的应用程序的集成。