ReddRadar
Agent skill
add-test
Generate unit or E2E test files for existing code
Install this agent skill to your Project
npx add-skill https://github.com/gitkraken/vscode-gitlens/tree/main/.claude/skills/add-test
SKILL.md
/add-test - Generate Tests
Usage
/add-test [type] [target]
type—unit(default) ore2etarget— File path or feature name to test
Unit Test Template
Creates src/path/__tests__/file.test.ts:
import * as assert from 'assert';
import { functionToTest } from '../file.js';
suite('FeatureName Test Suite', () => {
suite('functionName', () => {
test('should handle normal input', () => {
const result = functionToTest('input');
assert.strictEqual(result, 'expected');
});
test('should handle edge case', () => {
const result = functionToTest('');
assert.strictEqual(result, undefined);
});
test('should throw on invalid input', () => {
assert.throws(() => functionToTest(null), /error message/);
});
});
suite('async function', () => {
test('should resolve with data', async () => {
const result = await asyncFunction();
assert.deepStrictEqual(result, { key: 'value' });
});
});
});
When mocking is needed, use sinon:
import * as sinon from 'sinon';
let sandbox: sinon.SinonSandbox;
setup(() => {
sandbox = sinon.createSandbox();
});
teardown(() => {
sandbox.restore();
});
E2E Test Template
Creates tests/e2e/specs/feature.test.ts:
import { test as base, expect, GitFixture, MaxTimeout } from '../baseTest.js';
import { createTmpDir } from '../fixtures/tmpDir.js';
const test = base.extend({
vscodeOptions: [
{
vscodeVersion: process.env.VSCODE_VERSION ?? 'stable',
setup: async () => {
const repoDir = await createTmpDir();
const git = new GitFixture(repoDir);
await git.init();
await git.commit('Initial commit', 'README.md', '# Test');
return repoDir;
},
},
{ scope: 'worker' },
],
});
test.describe('Feature Name', () => {
test.describe.configure({ mode: 'serial' });
test('should display feature correctly', async ({ vscode, page, expect }) => {
await vscode.gitlens.openGitLensSidebar();
await expect(page.getByRole('heading')).toContainText('Expected');
});
});
Instructions
Unit Tests
- Read target file to understand exports
- Create
__tests__/directory if needed - Cover: normal paths, edge cases (empty/null/undefined), error conditions, async operations
- Assertions:
assert.strictEqual(),assert.deepStrictEqual(),assert.ok(),assert.throws()
E2E Tests
- Determine Git state needed (commits, branches, tags)
- Create GitFixture setup
- Cover: UI presence, user interactions, navigation, error states
- Assertions:
expect(locator).toBeVisible(),.toContainText(),.toHaveCount()
GitFixture Methods
await git.init()
await git.commit(message, fileName, content)
await git.branch(name)
await git.checkout(name, create?)
await git.tag(name, { message?, ref? })
await git.stash(message?)
await git.worktree(path, branch)
await git.addRemote(name, url)
await git.merge(branch, message?)
Running Tests
pnpm run test -- --grep "FeatureName" # Unit
pnpm run test:e2e -- tests/e2e/specs/file.test.ts # E2E
For detailed test running patterns, output interpretation, and debugging: see docs/testing.md.
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