PyDummies

Deterministic test doubles and service emulators for Python 3.13.

• Deterministic: seedable clocks/IDs/RNG
• Drop-in: typing.Protocol interfaces
• Fast: in-memory by default
• Observable: inspect state, counters, mailboxes, queues

Install

pip install -e .
# or build
pipx run build

Optional extras:

pip install .[http]       # ASGI emulator helpers (Starlette)
pip install .[vcr]        # record/replay

Quickstart

from devdummies.core.clock import FakeClock
from devdummies.fakes.mail_memory import InMemoryMailer

clock = FakeClock()
mailer = InMemoryMailer()
mid = mailer.send(to="user@example.com", subject="Welcome", body="Hello")
assert mailer.outbox[-1]["id"] == mid

License

MIT