React Native Testing

What it does

When your agent uses it

• Fixing React Native component tests
• : test files for React Native components
• Mentions of testing library
• Component tests

Example prompts

• “testing library”
• “write tests”
• “component tests”
• “/react-native-testing”

Workflow steps

11 steps, taken from the first numbered list in SKILL.md.

1. 1Use screen for queries, not destructuring from render()
2. 2Use getByRole first with { name: '...' } option
3. 3Use queryBy* ONLY for .not.toBeOnTheScreen() checks
4. 4Use findBy* for async elements, NOT waitFor + getBy*
5. 5Never put side-effects in waitFor (no fireEvent/userEvent inside)
6. 6One assertion per waitFor
7. 7Never pass empty callbacks to waitFor
8. 8Don't wrap in act() - render, fireEvent, userEvent handle it
9. 9Don't call cleanup() - automatic after each test
10. 10Prefer ARIA props (role, aria-label, aria-disabled) over legacy accessibility* props
11. 11Use RNTL matchers over raw prop assertions

What it can do on your machine

Read from SKILL.md and the folder at commit 61e6e7d. 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

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  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

React Native Testing loads about 1.8k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 134 tokens; SKILL.md has 474 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~134

When it runs · the whole SKILL.md, loaded when a task matches

~1.8k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~13k

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

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 callstackincubator/agent-skills at commit 61e6e7d, republished under its MIT licence (© callstackincubator). 474 words, ~1,826 tokens.

name

react-native-testing

description

Write tests using React Native Testing Library (RNTL) v13 and v14 (`@testing-library/react-native`). Use when writing, reviewing, or fixing React Native component tests. Covers: render, screen, queries (getBy/getAllBy/queryBy/findBy), Jest matchers, userEvent, fireEvent, waitFor, and async patterns. Supports v13 (React 18, sync render) and v14 (React 19+, async render). Triggers on: test files for React Native components, RNTL imports, mentions of "testing library", "write tests", "component tests", or "RNTL".

const user = userEvent.setup();
await user.press(element); // full press sequence
await user.longPress(element, { duration: 800 }); // long press
await user.type(textInput, 'Hello'); // char-by-char typing
await user.clear(textInput); // clear TextInput
await user.paste(textInput, 'pasted text'); // paste into TextInput
await user.scrollTo(scrollView, { y: 100 }); // scroll

fireEvent.press(element);
fireEvent.changeText(textInput, 'new text');
fireEvent(element, 'blur');

// Correct: action first, then wait for result
fireEvent.press(button);
await waitFor(() => {
  expect(screen.getByText('Result')).toBeOnTheScreen();
});

// Better: use findBy* instead
fireEvent.press(button);
expect(await screen.findByText('Result')).toBeOnTheScreen();

jest.useFakeTimers();

test('with fake timers', async () => {
  const user = userEvent.setup();
  render(<Component />);
  await user.press(screen.getByRole('button'));
  // ...
});

function renderWithProviders(ui: React.ReactElement) {
  return render(ui, {
    wrapper: ({ children }) => (
      <ThemeProvider>
        <AuthProvider>{children}</AuthProvider>
      </ThemeProvider>
    ),
  });
}

© callstackincubator, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in plugins/vendored/.agents/skills/react-native-testing of callstackincubator/agent-skills.

• SKILL.md
• references/anti-patterns.md
• references/api-reference-v13.md
• references/api-reference-v14.md

Open the folder on GitHubat commit 61e6e7d