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FastTest Agent

Create a Regression Suite

Vibe Shield explores your app, generates tests for every flow it finds, and saves them as a reusable suite. On subsequent runs, it re-executes the suite and reports regressions.

Prerequisites

  • FastTest Agent installed (Quick Start)
  • Cloud auth completed (setup tool) — required for persistent suites

Generate Your First Suite

  1. Run Vibe Shield

    Vibe shield my app at http://localhost:3000

    On the first run, FastTest performs a breadth-first exploration of your app — discovering pages, forms, and flows — then generates test cases for each.

  2. Watch the exploration

    Your AI assistant navigates through your app, building a map of pages and interactions. It then generates and executes tests:

    ✓ login flow           4/4
    ✓ checkout             6/6
    ✓ profile settings     3/3
    ✓ search               5/5
    ✓ … 8 more passed
    

    18/18 PASSED · suite saved · CI ready

  3. Suite is auto-saved

    The suite is saved to the cloud with the name Vibe Shield: localhost:3000 (derived from your app’s URL). Test cases include steps, assertions, and intent descriptions.

Check for Regressions

After making code changes, run Vibe Shield again:

Vibe shield my app at http://localhost:3000

This time, FastTest detects the existing suite and re-runs it as a regression check. The report shows:

  • Regressions — tests that previously passed but now fail
  • Fixes — tests that previously failed but now pass
  • Healed — selectors that broke but were auto-repaired
  • Unchanged — tests that still pass

Set Up Environments

Configure an environment so you never have to pass a URL:

Set up a “dev” environment for my project at http://localhost:3000

Then just say:

Vibe shield my app

FastTest resolves the URL from your environment config.

Customize Your Suite

Add individual tests to an existing suite:

Save a test called “admin can delete users” to the Vibe Shield suite

Test cases are upserted by name — existing tests are updated, new ones are added, unmentioned tests are kept.

Next Steps