Standardized guide and protocol for authoring robust Whitebox End-to-End tests using the Neural Link Playwright fixture. CRITICAL: Neo.mjs uses Playwright in a highly custom way. Standard Playwright patterns will fail. Triggers: Use this skill before writing, modifying, or executing Playwright End-to-End tests, or if the user asks you to write an E2E test, add end-to-end coverage, or test a component holistically.
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If you are tasked with writing new End-to-End tests for Neo.mjs applications, you MUST immediately use the view_file tool to read and strictly adhere to .agents/skills/whitebox-e2e/references/whitebox-e2e-protocol.md before planning your assertions or writing any test code.
This prevents the creation of brittle, visual-only DOM locator tests by ensuring you utilize the deep-state introspection capabilities of the Neural Link fixture.
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