Gradual typing of story steps
In order to speed up prototyping and development of a story suite, the structure of your YAML data specified in preconditions, parameters and step arguments need not be specified in advance.
All data that is parsed without a validator is parsed either as a dict, list or string, as per the StrictYAML spec.
When your story suite matures and the structure of your story files has solidified, you can specify validators that fail fast when YAML snippets with an invalid structure are used.
Create files: given: files created: preconditionfile.txt: some text steps: - Create file: details: file name: step1.txt content: some other text
from hitchstory import BaseEngine, GivenDefinition, GivenProperty class Engine(BaseEngine): given_definition = GivenDefinition( files_created=GivenProperty(), ) def set_up(self): for filename, contents in self.given['files_created'].items(): with open(filename, 'w') as handle: handle.write(contents) def create_file(self, details): with open(details['file name'], 'w') as handle: handle.write(details['content'])
from hitchstory import StoryCollection from pathquery import pathquery from engine import Engine
StoryCollection(pathquery(".").ext("story"), Engine()).named("Create files").play()
RUNNING Create files in /path/to/example.story ... SUCCESS in 0.1 seconds.
File preconditionfile.txt should now contain:
File step1.txt should now contain:
some other text
Page automatically generated from gradual-typing.story.