Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/vladolaru/claude-code-plugins/e2e-testing-patternsnpx skills add vladolaru/claude-code-plugins --skill e2e-testing-patternsgit clone --depth 1 https://github.com/vladolaru/claude-code-pluginsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vladolaru/claude-code-plugins/e2e-testing-patterns)<a href="https://agentmods.dev/skills/vladolaru/claude-code-plugins/e2e-testing-patterns"><img src="https://agentmods.dev/badge/skills/vladolaru/claude-code-plugins/e2e-testing-patterns.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00043 | $0.00934 |
| Opus 5 | $0.00022 | $0.00467 |
| Sonnet 5 | $0.00009 | $0.00187 |
| Haiku 4.5 | $0.00004 | $0.00093 |
Grade A, and why
e2e-testing-patterns scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Directory
Resolve SKILL_DIR to the absolute directory containing this SKILL.md, as
shown by the current host, before using any bundled path below.
Before a shell command uses $SKILL_DIR, assign it in that command or replace
it with the resolved path. It is not a host-exported environment variable.
E2E Testing Patterns
Playwright end-to-end testing patterns. For shared test quality principles (philosophy, smells, mocking decisions), see testing-patterns.
Reference Routing
| Need | Reference File | Sections to Read |
|---|---|---|
| Playwright + E2E patterns | $SKILL_DIR/../testing-patterns/references/playwright-patterns.md |
Full file (~461L, manageable) |
| Behavior vs implementation | $SKILL_DIR/../testing-patterns/references/test-philosophy.md |
## The Fundamental Shift + ## Four Core Principles |
| Flaky/brittle tests | $SKILL_DIR/../testing-patterns/references/test-smells.md |
## The Six Major Test Smells (relevant subsection) |
| Mock usage decisions | $SKILL_DIR/../testing-patterns/references/mocking-strategies.md |
## The Mocking Decision Framework |
| Test layer strategy | $SKILL_DIR/../testing-patterns/references/test-layers.md |
## The Three Layers + ## Choosing the Right Layer |
How to read sections: Grep for heading to find line number, Read with offset+limit.
Locator Priority (Best to Worst)
page.getByRole('button', { name: 'Submit' })— accessible, resilientpage.getByLabel('Email')— form elementspage.getByText('Welcome')— visible contentpage.getByTestId('checkout-form')— explicit test hookspage.locator('.class')/#id— last resort, fragile
E2E Quick Reference
| Use | Instead Of | Why |
|---|---|---|
await expect(locator).toBeVisible() |
page.waitForTimeout(2000) |
Auto-waits, deterministic |
page.getByRole() |
page.locator('.btn') |
Resilient to CSS changes |
| Page Object Model | Inline selectors | Reusable, single source of truth |
page.route() for external APIs |
Real HTTP calls | Fast, deterministic, no rate limits |
| Config-based URLs | http://localhost:8080 |
Works across environments |
toHaveScreenshot({ maxDiffPixelRatio: 0.01 }) |
toMatchSnapshot() |
Tolerates rendering differences |
test.describe() grouping |
Flat test structure | Logical organization |
await before all assertions |
Missing await |
Playwright assertions are async |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 71 lines · 43 tokens per session scan A cc6ba37ad9ec
e2e-testing-patterns is a skill published in the GitHub repository vladolaru/claude-code-plugins (8 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 934 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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