n4s/src/rules/array/__tests__/lengthEquals.test.ts

typed schema validation version of enforce

import { describe, it, expect } from 'vitest';

import { enforce } from '../../../n4s';

describe('lengthEquals', () => {
  it('pass when length matches exactly', () => {
    expect(enforce.isArray<number>().lengthEquals(2).run([1, 2]).pass).toBe(
      true,
    );
    expect(enforce.isArray<number>().lengthEquals(0).run([]).pass).toBe(true);
    expect(
      enforce.isArray<string>().lengthEquals(3).run(['a', 'b', 'c']).pass,
    ).toBe(true);
  });

  it('fails when length differs', () => {
    expect(enforce.isArray<number>().lengthEquals(1).run([]).pass).toBe(false);
    expect(enforce.isArray<number>().lengthEquals(1).run([1, 2]).pass).toBe(
      false,
    );
    expect(enforce.isArray<string>().lengthEquals(5).run(['a', 'b']).pass).toBe(
      false,
    );
  });
});