Temporal Python Testing Strategies

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

Do not use this skill when

• •The task is unrelated to temporal python testing strategies
• •You need a different domain or tool outside this scope

Instructions

• •Clarify goals, constraints, and required inputs.
• •Apply relevant best practices and validate outcomes.
• •Provide actionable steps and verification.
• •If detailed examples are required, open resources/implementation-playbook.md.

Use this skill when

• •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:

1. •Unit: Workflows with time-skipping, activities with ActivityEnvironment
2. •Integration: Workers with mocked activities
3. •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

1. •Time-Skipping - Month-long workflows test in seconds
2. •Mock Activities - Isolate workflow logic from external dependencies
3. •Replay Testing - Validate determinism before deployment
4. •High Coverage - ≥80% target for production workflows
5. •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

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