Testing

Network automation mistakes are expensive — a bad config push can take down production links. Testing your function blocks before deployment is not optional; it is the single most important step in your development workflow.

The SDK provides three levels of testing:

Level	What it tests	Speed	Devices needed
Standalone	Logic, parameters, results	Fast	None
@fb_test_case	Full execution lifecycle with blocking detection	Fast	None (mock context)
@fb_test_case_with_lab	End-to-end against real devices	Slow	Remote lab

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In This Section

Guide	What you'll learn
Test Suite Setup	pytest configuration, asyncio mode, conftest patterns
Testing Function Blocks	Standalone tests, @fb_test_case, mocking connections
Remote Lab Testing	@fb_test_case_with_lab, lab fixtures, topology provisioning
Testing Plugins and Proxies	Plugin tests, registry isolation, capability verification
Debugging	VSCode setup, common errors, blocking detector, logging

Quick start

For a minimal first test, see Testing Your Function Block in the Getting Started guide.