eslint-plugin-aaa-comments
v1.0.5
Published
ESLint plugin for enforcing AAA comments.
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eslint-plugin-aaa-comments
This plugin provide rule for enforcing AAA (Arrange Act Assert) comments or enforces you to organize your it
cases into 3 sections without enforcing comments in unit tests.
For the motivation refer to Making Better Unit Tests: part 1, the AAA pattern.
Installation
# inside your project's working tree
npm install eslint-plugin-aaa-comments --save-dev
Config - Legacy (.eslintrc
)
All rules are off by default. Configuring manually:
{
"rules": {
"aaa-comments/enforce-aaa-comments": "error"
// etc...
},
},
Config - Flat (eslint.config.js
)
All rules are off by default. However, you may configure them manually in your eslint.config.(js|cjs|mjs)
.
import js from '@eslint/js';
export default [
js.configs.recommended,
{
files: ['**/*.{js,mjs,cjs}'],
languageOptions: {
ecmaVersion: 'latest',
sourceType: 'module',
},
rules: {
'aaa-comments/enforce-aaa-comments': 'error',
},
},
];
Rules
The package consists of only one single rule
aaa-comments/enforce-aaa-comments
Enforces you to write AAA (Arrange Act Assert) comments in unit tests. How the rule works:
- Find every
it
function - Find the second argument of the function which is usually a function
- Within that function calculates how many line breaks does it have
Based on the number of line breaks it
callback have:
- If 0 and single statement – passes
- If 0 and more than one statements – fails
- If 1 or 2 line breaks – passes
- If 3 line breaks – requires you to have AAA comments
Examples
Here's passing examples:
it('works', async () => {
const result = await client.invalidate({ userId: Random.int(1000000) });
assert.strictEqual(result.isSuccess, true);
});
it('works', async () => {
const foo = 'bar';
const result = await client.invalidate({ userId: Random.int(1000000) });
assert.strictEqual(result.isSuccess, true);
});
it('works', async () => {
// Arrange
const foo = 'bar';
// Act
const result = await client.invalidate({ userId: Random.int(1000000) });
const result2 = await client.invalidate({ userId: Random.int(1000001) });
// Assert
assert.strictEqual(result.isSuccess, true);
});
Here's examples which are not passing:
it('works', async () => {
const result = await client.invalidate({ userId: Random.int(1000000) });
assert.strictEqual(result.isSuccess, true);
});
it('works', async () => {
const foo = 'bar';
const result = await client.invalidate({ userId: Random.int(1000000) });
const result2 = await client.invalidate({ userId: Random.int(1000001) });
assert.strictEqual(result.isSuccess, true);
});