temporal-python-testing

• 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

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)

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

Basic Workflow Test

```python

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

```python

from temporalio.testing import ActivityEnvironment

async def test_activity():

env = ActivityEnvironment()

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

assert result == expected_output

```

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

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

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

• 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