#prefer-each

#Configuration

import { defineConfig, rstestPlugin } from '@rslint/core';

export default defineConfig([
  rstestPlugin.configs.recommended,
  {
    rules: {
      'rstest/prefer-each': 'error',
    },
  },
]);

#Rule Details

Prefers parameterized Rstest registrations over manually registering tests, suites, or hooks inside a loop. .each keeps related cases together in test output and gives each case a clear title.

Loops used as ordinary test logic are allowed. When a loop registers one test, the diagnostic recommends test.each or it.each; loops that register suites, hooks, or several entries recommend describe.each.

#Incorrect

for (const input of [1, 2, 3]) {
  test(`doubles ${input}`, () => {
    expect(double(input)).toBe(input * 2);
  });
}

#Correct

test.each([1, 2, 3])('doubles %i', (input) => {
  expect(double(input)).toBe(input * 2);
});