📝e2e-testing.md

AI-Powered E2E Testing: Shift-Left with Playwright CLI

Series Overview

This series is about fixing three very common testing failures in the right order.

API coverage is written as giant bespoke specs instead of data-driven suites.
Test setup is hidden in beforeEach hooks and helper sprawl instead of being local and readable.
UI tests try to carry too much responsibility because the API layer was never made solid first.

The goal is not "use builders everywhere."

The goal is:

direct API coverage for endpoint behavior
fluent builders for setup and seeding
short UI tests that focus on user workflows

The Working Model

Think about the stack in order, not as a buzzword diagram.

Direct API tests cover create, read, update, delete, filtering, auth, boundaries, and negative cases.
Builders sit on top of that coverage and create dependency graphs quickly.
UI tests use those builders so setup stays out of the browser and out of beforeEach.

One-line thesis:

Direct API tests prove behavior. Builders remove setup noise. Short UI tests prove the workflow.

Target Application

We use RealWorld (Conduit) because it has a stable API spec and a familiar set of domains:

users and auth
articles and tags
comments
profiles and follows

That keeps the examples realistic without tying the series to one product codebase.

Series Roadmap

#	Article	Focus
01	Why We're Building a 2-Line E2E Testing Framework	The real problems to fix
02	Installing Playwright and Building Our Test Foundation	API-first Playwright setup
03	The Foundation: TestDefaults & TestDataHelper	Unique data and cleanup primitives
04	Stop Hand-Writing Giant API Specs	Data-driven direct API testing
05	Negative Cases, Boundary Coverage, and bugs.md	How to make failures useful
06	Builders as Seeding: Replace beforeEach Sprawl	Fluent setup for higher-level tests
07	One-Line Cleanup: The destroyWithAllDeps Pattern	Cleanup without hidden mess
08	Expanding Coverage: CommentBuilder & UserBuilder	More setup primitives
09	Page Components: Beyond Simple POM	UI structure
10	Fluent Form Builders: The FormBuilder Pattern	UI interaction layer
11	Inline Data Seeding: The .as() Method	Localize setup to the test
12	Putting It Together: 2-Line E2E Tests That Stay Honest	Short tests with clear intent
13	Maintaining 100% Coverage with AI Agents	Coverage tracking and maintenance

The Directory Shape We Are Building Toward

automation/
  src/
    api/
      domains/
        content/
          posts/
            PostUtils.ts
            PostValidations.ts
            post.types.ts
            index.ts
  tests/
    content/
      posts/
        PostTest.spec.ts
        PostNegativeTest.spec.ts
        Post.json
        PostNegative.json
        bugs.md
  builders/
    PostBuilder.ts
    UserBuilder.ts
    TestDataFactory.ts
  pages/
    components/
    form-builders/

The Shift

Old style:

one huge API spec
duplicated request code
duplicated assertions
setup hidden in hooks
UI tests recreate everything through the browser

New style:

scenario rows in JSON
thin specs
reusable validations
local builder-based seeding
UI tests that stay focused

Start with Why We're Building a 2-Line E2E Testing Framework ->