Agent skill

Mockito

A skill your agent uses when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito).

MITAuto-check passedMobile

Install Mockito

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/mockito .claude/skills/mockito && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .claude/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/mockito .agents/skills/mockito && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .agents/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/mockito .cursor/skills/mockito && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .cursor/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/evanca/flutter-ai-rules.git --path skills/mockito

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/mockito .gemini/skills/mockito && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .gemini/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/mockito .github/skills/mockito && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .github/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add evanca/flutter-ai-rules --skill mockito -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install evanca/flutter-ai-rules mockito --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/evanca/flutter-ai-rules.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/mockito .opencode/skills/mockito && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "mockito" agent skill from https://github.com/evanca/flutter-ai-rules/tree/main/skills/mockito into .opencode/skills/mockito/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mockito", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: mockito
GitHub stars: 649
Token cost: ~905 tokens
SKILL.md length: 261 words
Files: 1
Skills in repo: 37
Repo updated: Sep 14, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito).

Works in 9 steps: Mock vs. Fake vs. Real Object → Generating Mocks → Stubbing → …
Generating mocks
SKILL.md covers 1. Mock vs. Fake vs. Real Object, 2. Generating Mocks, 3. Stubbing and 4. Verification, plus 6 more sections
Calls dart

What it does

Mockito is an agent skill from evanca/flutter-ai-rules. Use when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito).

Its SKILL.md is about 910 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Mobile. The repository describes itself as: Flutter AI Skills and Rules for Claude, Codex, Cursor, and Other AI-Powered IDEs. The licence is MIT.

When your agent uses it

Generating mocks
Stubbing methods
Verifying interactions
Capturing arguments

Example prompts

“/mockito”

Workflow steps

9 steps, taken from the step headings in SKILL.md.

Mock vs. Fake vs. Real Object
Generating Mocks
Stubbing
Verification
Argument Matchers
Capturing Arguments
Resetting Mocks
Mocking Function Types
Debugging

What it can do on your machine

Read from SKILL.md and the folder at commit 7b9cce2. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- dart
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mockito loads about 905 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 261 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~40
When it runs · the whole SKILL.md, loaded when a task matches: ~905

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from evanca/flutter-ai-rules at commit 7b9cce2, republished under its MIT licence (© evanca). 261 words, ~905 tokens.

Download SKILL.mdSave it as .claude/skills/mockito/SKILL.md (or your agent's skills folder).

name: mockito
description: Use when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito).
license: MIT

Mockito Skill

This skill defines how to correctly use the mockito package for mocking in Dart and Flutter tests.

1. Mock vs. Fake vs. Real Object

Use	When
Real object	Prefer over mocks when practical.
Fake (`extends Fake`)	Lightweight custom implementation; override only the methods you need. Prefer over mocks when you don't need interaction verification.
Mock (`extends Mock`)	Only when you need to verify interactions (call counts, arguments) or stub dynamic responses.

Data models should not be mocked if they can be constructed with stubbed data.
Only use mocks if your test has verify assertions; otherwise prefer real or fake objects.

2. Generating Mocks

dart

@GenerateMocks([MyClass])
// or for nice mocks (return simple legal values for missing stubs):
@GenerateNiceMocks([MockSpec<MyClass>()])
void main() { ... }

bash

dart run build_runner build

Only annotate files under test/ for mock generation by default.
Use a build.yaml if you need to generate mocks outside of test/.
Never add @override methods or implementations to a class extending Mock.
Never stub responses in a mock's constructor or inside the mock class — always stub in your tests.

3. Stubbing

dart

final mock = MockCat();

// Return a value
when(mock.sound()).thenReturn('Meow');

// Throw an error
when(mock.sound()).thenThrow(Exception('No sound'));

// Calculate response at call time
when(mock.sound()).thenAnswer((_) => computedValue);

// Return values in sequence
when(mock.sound()).thenReturnInOrder(['Meow', 'Purr']);

Always stub methods/getters before using them if you need specific return values.
Missing stub behavior: @GenerateMocks → throws; @GenerateNiceMocks → returns a simple legal value.
Use throwOnMissingStub(mock) to throw on any unstubbed call.

4. Verification

dart

verify(mock.sound());                  // called at least once
verifyNever(mock.eat(any));            // never called
verify(mock.sound()).called(2);        // called exactly twice

Async:

dart

await untilCalled(mock.sound());       // wait for the interaction

5. Argument Matchers

dart

// Flexible stubbing
when(mock.eat(any)).thenReturn(true);
when(mock.eat(argThat(isNotNull))).thenReturn(true);

// Named arguments
when(mock.fetch(any, headers: any)).thenReturn(response);

Do not use null as an argument adjacent to an argument matcher.
For named arguments, use any or argThat as values, not as argument names.

6. Capturing Arguments

dart

final captured = verify(mock.eat(captureAny)).captured;
print(captured.last); // last captured argument

Use captureThat for conditional capturing.

7. Resetting Mocks

dart

reset(mock);                  // clear all stubs AND interactions
clearInteractions(mock);      // clear only recorded interactions

8. Mocking Function Types

To mock a function type (e.g., a callback), define an abstract class with the required signature and generate mocks for it:

dart

abstract class Callback {
  void call(String value);
}

@GenerateMocks([Callback])

9. Debugging

dart

logInvocations([mock1, mock2]); // print all collected invocations

References

Mockito GitHub Repository

Files

Just SKILL.md in skills/mockito of evanca/flutter-ai-rules.

Open the folder on GitHubat commit 7b9cce2

Compare with similar skills

Mockito next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Mockito compared with similar skills
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Kortix Brandkortix-ai/suna	20k	—	~4k	Automated safety check: Pass	Custom licence	yesterday
Ip As LogoKartikLabhshetwar/better-shot	2.4k	1 repos	~4.3k	Automated safety check: Pass	MIT	7 days ago
Compose Multiplatform Patternsmonta-app/ocpp-emulator	180	5 repos	~2k	Automated safety check: Pass	Apache-2.0	7 days ago

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Questions about Mockito

What does Mockito do?

A skill your agent uses when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito). Mockito is an agent skill from evanca/flutter-ai-rules. Use when generating mocks, stubbing methods, verifying interactions, capturing arguments, or choosing between mocks, fakes, and real objects (Mockito).

When should I use Mockito?

Mockito fits situations like: generating mocks; stubbing methods; verifying interactions; capturing arguments.

How do I install Mockito in Claude Code?

Run `npx skills add evanca/flutter-ai-rules --skill mockito -a claude-code`. Or copy the skill folder (skills/mockito in evanca/flutter-ai-rules) into .claude/skills/mockito in your project. Claude Code loads it when a task matches its description.

How do I install Mockito in Codex?

Run `npx skills add evanca/flutter-ai-rules --skill mockito -a codex`. Or copy the skill folder (skills/mockito in evanca/flutter-ai-rules) into .agents/skills/mockito in your project. Codex loads it when a task matches its description.

Can I use Mockito in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add evanca/flutter-ai-rules --skill mockito -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mockito, .gemini/skills/mockito, .github/skills/mockito and .opencode/skills/mockito in your project.

What does Mockito need to run?

Going by SKILL.md and its folder, Mockito needs the command-line tools its instructions call (dart).

Does Mockito access the network?

SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.

Is Mockito safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Mockito use?

Mockito is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mockito use?

About 905 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Mockito?

Skills that share tags, products or a category with Mockito: React Native Best Practices (vercel-labs/openreview, 1.7k stars), Swiftui Pro (twostraws/SwiftUI-Agent-Skill, 5.1k stars), Kortix Brand (kortix-ai/suna, 20k stars) and Ip As Logo (KartikLabhshetwar/better-shot, 2.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mockito?

evanca (a GitHub user) maintains it in evanca/flutter-ai-rules, which has 649 GitHub stars. The repository holds 37 skills in this directory. The repository was last updated on September 14, 2026.

Source: evanca/flutter-ai-rules on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Mockito

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Mockito Skill

1. Mock vs. Fake vs. Real Object

2. Generating Mocks

3. Stubbing

4. Verification

5. Argument Matchers

6. Capturing Arguments

7. Resetting Mocks

8. Mocking Function Types

9. Debugging

References

Files

Compare with similar skills

Similar skills

More from evanca/flutter-ai-rules

Related

Questions about Mockito