Document about the ways to write unit tests for Bolt apps

I am looking to write unit tests for my Bolt API, which consists of an app with several handlers for events / messages. The handlers are both decorated using the app.event decorator, and make use of the app object to access things like the db connection that has been put on it. For example:

# in main.py
app = App(
    token=APP_TOKEN,
    signing_secret=SIGNING_SECRET,
    process_before_response=True,
    token_verification_enabled=token_verification_enabled,
)
app.db = db

# in api.py:
from .main import app

@app.command("/slashcommand")
def slash_command(ack, respond):
    ack()
    results = app.db.do_query()
    respond(...)

The thing is, I cannot find any framework pointers, or documentation, on how I would write reasonable unit tests for this. Presumably ones where the kwargs like ack and respond are replaced by test doubles. How do I do this?

The page URLs

• https://slack.dev/bolt-python/

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

Start with the Bolt for Python documentation at https://slack.dev/bolt-python/ and review the handler structure shown in main.py and api.py, including app.command, app.event, app.db, ack, and respond. Document a reasonable unit-testing approach for these handlers, including test doubles for the handler arguments and app dependencies, with examples that make the expected behavior clear.