Temporal Python Testing Strategies

Comprehensive testing approaches for Temporal workflows using pytest, progressive disclosure resources for specific testing scenarios.

When to Use This Skill

• Unit testing workflows - Fast tests with time-skipping

• Integration testing - Workflows with mocked activities

• Replay testing - Validate determinism against production histories

• Local development - Set up Temporal server and pytest

• CI/CD integration - Automated testing pipelines

• Coverage strategies - Achieve ≥80% test coverage

Testing Philosophy

Recommended Approach (Source: docs.temporal.io/develop/python/testing-suite):

• Write majority as integration tests

• Use pytest with async fixtures

• Time-skipping enables fast feedback (month-long workflows → seconds)

• Mock activities to isolate workflow logic

• Validate determinism with replay testing

Three Test Types:

• Unit: Workflows with time-skipping, activities with ActivityEnvironment

• Integration: Workers with mocked activities

• End-to-end: Full Temporal server with real activities (use sparingly)

Available Resources

This skill provides detailed guidance through progressive disclosure. Load specific resources based on your testing needs:

Unit Testing Resources

File: resources/unit-testing.md

When to load: Testing individual workflows or activities in isolation

Contains:

• WorkflowEnvironment with time-skipping

• ActivityEnvironment for activity testing

• Fast execution of long-running workflows

• Manual time advancement patterns

• pytest fixtures and patterns

Integration Testing Resources

File: resources/integration-testing.md

When to load: Testing workflows with mocked external dependencies

Contains:

• Activity mocking strategies

• Error injection patterns

• Multi-activity workflow testing

• Signal and query testing

• Coverage strategies

Replay Testing Resources

File: resources/replay-testing.md

When to load: Validating determinism or deploying workflow changes

Contains:

• Determinism validation

• Production history replay

• CI/CD integration patterns

• Version compatibility testing

Local Development Resources

File: resources/local-setup.md

When to load: Setting up development environment

Contains:

• Docker Compose configuration

• pytest setup and configuration

• Coverage tool integration

• Development workflow

Quick Start Guide

Basic Workflow Test

import pytest

from temporalio.testing import WorkflowEnvironment

from temporalio.worker import Worker

@pytest.fixture

async def workflow_env():

    env = await WorkflowEnvironment.start_time_skipping()

    yield env

    await env.shutdown()

@pytest.mark.asyncio

async def test_workflow(workflow_env):

    async with Worker(

        workflow_env.client,

        task_queue="test-queue",

        workflows=[YourWorkflow],

        activities=[your_activity],

    ):

        result = await workflow_env.client.execute_workflow(

            YourWorkflow.run,

            args,

            id="test-wf-id",

            task_queue="test-queue",

        )

        assert result == expected

Basic Activity Test

from temporalio.testing import ActivityEnvironment

async def test_activity():

    env = ActivityEnvironment()

    result = await env.run(your_activity, "test-input")

    assert result == expected_output

Coverage Targets

Recommended Coverage (Source: docs.temporal.io best practices):

• Workflows: ≥80% logic coverage

• Activities: ≥80% logic coverage

• Integration: Critical paths with mocked activities

• Replay: All workflow versions before deployment

Key Testing Principles

• Time-Skipping - Month-long workflows test in seconds

• Mock Activities - Isolate workflow logic from external dependencies

• Replay Testing - Validate determinism before deployment

• High Coverage - ≥80% target for production workflows

• Fast Feedback - Unit tests run in milliseconds

How to Use Resources

Load specific resource when needed:

• "Show me unit testing patterns" → Load resources/unit-testing.md

• "How do I mock activities?" → Load resources/integration-testing.md

• "Setup local Temporal server" → Load resources/local-setup.md

• "Validate determinism" → Load resources/replay-testing.md

Additional References

• Python SDK Testing: docs.temporal.io/develop/python/testing-suite

• Testing Patterns: github.com/temporalio/temporal/blob/main/docs/development/testing.md

• Python Samples: github.com/temporalio/samples-python