如何在python中模拟为特定路径打开的文件？

from unittest.mock import mock_open, patch

def read_file(file_path):
    with open(file_path, 'r') as file:
        return file.read()

def test_read_file():
    file_path = '/path/to/file.txt'
    file_content = 'Hello, World!'

    # 创建一个mock对象，模拟文件的读取操作
    mock = mock_open(read_data=file_content)

    # 使用patch装饰器将open函数替换为mock对象
    with patch('builtins.open', mock):
        content = read_file(file_path)

    assert content == file_content

test_read_file()