Pytest Plugin¶

The Sift Python client ships a pytest plugin that turns a pytest run into a TestReport in Sift. Each test function becomes a TestStep, measurements are presented as rows under that step, and failures propagate up through nested substeps to the report itself.

Quick start¶

Install the client and pytest:

pip install sift-stack-py pytest

The default sift_client fixture reads its connection details from the environment:

SIFT_API_KEY="..."
SIFT_GRPC_URI="..."
SIFT_REST_URI="..."

Find these on the Sift Manage page, where you can also generate an API key. Set them in your shell or CI secret store. For local dev, pip install pytest-dotenv and drop the same values in a .env next to your tests — it loads them automatically, no code required.

Register the plugin with a single pytest_plugins declaration in your top-level conftest.py:

conftest.py

pytest_plugins = ["sift_client.pytest_plugin"]

Write a test. The step fixture is autouse, so any test becomes a step on the report. Take it as an argument when you want to record a measurement:

test_battery.py

def test_battery_voltage(step):
    step.measure(
        name="battery_voltage",
        value=4.97,
        bounds={"min": 4.8, "max": 5.2},
        unit="V",
    )
    step.fail_if_measurements_failed()

Run it:

pytest

A TestReport shows up in Sift once the session finishes.

Fail at the end, not per measurement

step.measure(...) returns a pass/fail boolean and never raises, so a failing measurement marks the step failed without aborting the test. Take every measurement first, then call step.fail_if_measurements_failed() once at the end, so every measurement still lands in the report even when one fails. It fails the test via pytest.fail (no assertion noise in error_info), and unlike asserting on an individual step.measure(...) call it does not short-circuit on the first failure and skip every measurement after it.

Sensible defaults¶

With nothing but the conftest.py above, you get:

Full step tree. Every Python package, test module, test class, and parametrize axis above a test becomes a parent step, so the report mirrors your test layout.
Online mode. The plugin pings Sift at session start and streams create/update calls to your tenant during the run.
Git metadata. Repo, branch, and commit are captured on the report automatically.

Everything is on by default and individually overridable. See Configuration & Defaults for the full audit of every knob, marker, flag, and fixture.

Running modes¶

The plugin runs in one of three modes, picked at invocation.

Mode	How to select	Contacts Sift	When to use
Online	default (no flag)	Yes, during the run	Default choice
Offline	`--sift-offline`	No; records to a log file for later replay	Environments without Sift access.
Disabled	`--sift-disabled`	No	Local dev. Bounds still evaluate and return a real pass/fail.

Online mode pings Sift once at session start and aborts if Sift is unreachable or the credentials are invalid, so a misconfigured job fails immediately instead of silently producing no report. During the run, every create and update is appended to a JSONL log file. A background worker uploads new entries to Sift incrementally. If the connection drops mid-test, the test keeps running and the log keeps writing locally. The remaining entries can be uploaded afterward by running import-test-result-log, which the plugin prints on exit.

See Running Modes for the log-file and replay pipeline, overriding the connection check, and replaying a saved log.

Report structure¶

The report tree mirrors your test layout: packages, modules, classes, and parametrize axes nest automatically, and you can open arbitrary substeps inside a test. See Report Structure for the layout-to-tree mapping, measurement variants, and report metadata.

Pass/fail outcomes¶

Every pytest outcome (pass, assertion failure, exception, skip, xfail, hard exit) maps to a TestStatus, and failures roll up to the parent steps and the report. See Pass/Fail Behavior.

Try the runnable demo¶

The Pytest Plugin Quickstart walks through a self-contained demo project that exercises every layer of the step tree, with instructions to run it with or without a Sift tenant.