A testing guide for Flutter applications using Clean Architecture and Riverpod, a Flutter state-management library. It covers unit, widget, golden, and integration tests, along with test doubles and coverage reviews.

Use it to write or review tests, test Riverpod providers, create mocks and spies, check coverage, and verify visual layouts.

It helps create tests that show intent, catch regressions, and avoid brittle checks in Flutter code.

testing — Skill by launch52-ai

Install

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.

agentmods

npx agentmods add skills/launch52-ai/flutter-template/testing

Any agent

npx skills add launch52-ai/flutter-template --skill testing

Clone the repo

git clone --depth 1 https://github.com/launch52-ai/flutter-template

Made for: Claude Code, Codex.

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 772 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00050	$0.00772
Opus 5	$0.00025	$0.00386
Sonnet 5	$0.00010	$0.00154
Haiku 4.5	$0.00005	$0.00077

Measured yesterday against content hash 18216fef2d49, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

testing 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.

.claude/skills/testing/SKILL.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Testing - Write & Review Tests

Write high-quality, maintainable tests following Clean Architecture patterns. Every test should clearly express intent and catch regressions without being brittle.

When to Use This Skill

Writing new tests (unit, widget, golden, integration)
Reviewing test code quality
Setting up test infrastructure (helpers, mocks, spies)
Testing Riverpod providers and notifiers
Auditing test coverage

Quick Reference

Test Types

Type	Purpose	When to Use
Unit	Isolated logic	Repositories, services, utils, providers
Widget	UI interactions	Screens, navigation
Golden	Visual regression	Layout, themes
Integration	Real implementations	Storage, cache, API flows

Naming Conventions

Type	Pattern	Example
File	`{component}_test.dart`	`auth_repository_impl_test.dart`
Test	`test_{subject}_{scenario}_{expected}`	`test_signIn_withValidCredentials_returnsAuthResult`
Factory	`any{Type}()`	`anyEmail()`, `anyUserProfile()`
SUT	`makeSUT()`	Creates System Under Test

Commands

# Run all tests
flutter test

# Run with coverage
flutter test --coverage

# Run specific type
flutter test test/unit/
flutter test test/widget/

# Audit test coverage
dart run .claude/skills/testing/scripts/check.dart

# Generate missing test files
dart run .claude/skills/testing/scripts/check.dart --generate

# Update golden files
flutter test --update-goldens test/golden/

Workflow

1. Create Test File

Mirror source path: test/unit/features/{feature}/data/repositories/{name}_test.dart

2. Write Tests Using Patterns

See patterns-guide.md for:

makeSUT() - Factory for System Under Test
Spy Pattern - Track method calls
Arrange-Act-Assert - Clear structure
Disposal Testing - Verify cleanup
Inbox Checklist - Infrastructure testing

3. Verify Coverage

Read the full file on GitHub · 118 lines

Files

What ships with it

14 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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 · 118 lines · 50 tokens per session scan A 18216fef2d49

Subscribe to this mod's changes

testing is a skill published in the GitHub repository launch52-ai/flutter-template (2 stars, last pushed 6mo ago), licensed MIT. It adds 50 tokens to every session and 772 once invoked, about $0.0003 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 2026-08-31.

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