这些示例演示了如何构建从程序输出（测试中快照测试）自身重写的故事情节。这可以通过以下方式完成

self.current_step.rewrite("argument").to("new output")

代码示例

example.story

Append text to file:
  steps:
    - Run: echo hello >> mytext.txt
    - Run: echo hello >> mytext.txt
    - Run: echo hello >> mytext.txt

  variations:
    Output text to:
      following steps:
        - Run and get output:
            command: cat mytext.txt
            will output: old value

engine.py

from hitchstory import BaseEngine

class Engine(BaseEngine):
    def __init__(self, rewrite=True):
        self._rewrite = rewrite

    def run(self, command):
        pass

    def run_and_get_output(self, command, will_output):
        if self._rewrite:
            self.current_step.rewrite("will_output").to("hello\nhello")

带有代码

from hitchstory import StoryCollection
from pathlib import Path
from engine import Engine

当使用 rewrite=True 时，故事将被重写

StoryCollection(Path(".").glob("*.story"), Engine(rewrite=True)).ordered_by_name().play()

将输出

RUNNING Append text to file in /path/to/working/example.story ... SUCCESS in 0.1 seconds.
RUNNING Append text to file/Output text to in /path/to/working/example.story ... SUCCESS in 0.1 seconds.

文件 example.story 现在应包含

Append text to file:
  steps:
  - Run: echo hello >> mytext.txt
  - Run: echo hello >> mytext.txt
  - Run: echo hello >> mytext.txt

  variations:
    Output text to:
      following steps:
      - Run and get output:
          command: cat mytext.txt
          will output: |-
            hello
            hello

当使用 rewrite=False 时，故事将保持不变。

StoryCollection(Path(".").glob("*.story"), Engine(rewrite=False)).ordered_by_name().play()

将输出

RUNNING Append text to file in /path/to/working/example.story ... SUCCESS in 0.1 seconds.
RUNNING Append text to file/Output text to in /path/to/working/example.story ... SUCCESS in 0.1 seconds.

然后 example 故事将保持不变。

可执行规范

从 rewrite-story.story storytests 自动生成的文档。