Flutter Testing & Quality Agent Skill

Comprehensive Flutter testing and quality assurance guidance covering unit testing, widget testing, integration testing, golden tests…

Context cost
50.8k tokensestimated from the bundle, loaded when it triggers
Bundle
9 files · 203.1 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Comprehensive Flutter testing and quality assurance guidance covering unit testing, widget testing, integration testing, golden tests, debugging techniques, code coverage, test-driven development, mocking strategies, DevTools profiling, and quality metrics. Use when testing Flutter applications, writing unit tests, widget tests, integration tests, debugging issues, improving test coverage, creating golden files, mocking dependencies, profiling performance, or establishing testing strategies.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

fluttermobiletesting

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md17.7 kB · preview
--- name: flutter-core:flutter-testing-quality trigger_phrases: - test Flutter app - write tests - unit test - widget test - integration test - golden test - visual regression - mock dependencies - test coverage - debugging Flutter - DevTools - Flutter debugger - test strategy - TDD - test-driven development - flutter_test - integration_test - mockito - test package - testWidgets - pumpWidget - find.byType - expect - verify - setUp - tearDown - debugging techniques - performance profiling - memory leaks - testing best practices ---
42# Flutter Testing & Quality
43
44A comprehensive guide to testing and quality assurance in Flutter applications. This skill covers the complete testing pyramid from fast unit tests to comprehensive integration tests, along with debugging techniques, profiling strategies, and quality metrics that ensure your Flutter apps are reliable, maintainable, and performant.
45
46## Philosophy: Testing as a First-Class Citizen
47
48Flutter's testing framework is not an afterthought—it's a core part of the development experience. The framework provides excellent testing APIs that make it genuinely pleasant to write tests. Testing in Flutter follows the testing pyramid: many fast unit tests at the base, a moderate number of widget tests in the middle, and fewer but crucial integration tests at the top.
49
50The key insight is that testing isn't just about catching bugs—it's about designing better APIs, improving code architecture, and giving you confidence to refactor and evolve your codebase. Well-tested Flutter apps are easier to maintain, onboard new developers to, and extend with new features.
51
52## Understanding the Testing Pyramid
53
54Flutter supports three types of tests, each serving a distinct purpose in your quality assurance strategy.
55
56### Unit Tests
57
58Unit tests validate individual functions, methods, and classes in isolation. They are the foundation of your testing strategy because they:
59
60- Run extremely fast (thousands can execute in seconds)
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md2,214 words
Files9
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈280
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
50,495
on trigger
The instruction body and 8 supporting files, read only when the skill fires.
25.4%
of a 200k window
Ten skills this size would not fit in the window together.
050k100k150k200k context window

50.8k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

9 files, 203.1 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md17.7 kB
  • examples/mocking-strategies.md23.7 kB
  • examples/test-patterns.md26.4 kB
  • references/debugging.md18.2 kB
  • references/golden-tests.md21.5 kB
  • references/integration-testing.md25.4 kB
  • references/test-coverage.md17.1 kB
  • references/unit-testing.md25.2 kB
  • references/widget-testing.md27.9 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 9 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Flutter Testing & Quality · 50.8k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/flutter-testing-quality/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/flutter-testing-quality" ] && { [ ! -e .claude/skills/flutter-testing-quality ] || { mv .claude/skills/flutter-testing-quality "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/flutter-testing-quality" .claude/skills/ && echo "Installed .claude/skills/flutter-testing-quality"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add aaronbassett/flutter-testing-quality

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/flutter-testing-quality/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/flutter-testing-quality/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/flutter-testing-quality" ] && { [ ! -e ~/.claude/skills/flutter-testing-quality ] || { mv ~/.claude/skills/flutter-testing-quality "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/flutter-testing-quality" ~/.claude/skills/ && echo "Installed ~/.claude/skills/flutter-testing-quality" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/flutter-testing-quality/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as flutter-core:flutter-testing-quality in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, flutter-testing-quality.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referenceaaronbassett/flutter-testing-quality

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

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