svelte-i18n/test/runtime/includes/lookup.test.ts

import { lookup, lookupCache } from '../../../src/runtime/includes/lookup';
import {
  $dictionary,
  addMessages,
} from '../../../src/runtime/stores/dictionary';

beforeEach(() => {
  $dictionary.set({});
});

test('returns null if no locale was passed', () => {
  expect(lookup('message.id', undefined)).toBeUndefined();
  expect(lookup('message.id', null)).toBeUndefined();
});

test('gets a shallow message of a locale dictionary', () => {
  addMessages('en', { field: 'name' });

  expect(lookup('field', 'en')).toBe('name');
});

test('gets a deep message of a locale dictionary', () => {
  addMessages('en', { deep: { field: 'lastname' } });
  expect(lookup('deep.field', 'en')).toBe('lastname');
});

test('gets a message from the fallback dictionary', () => {
  addMessages('en', { field: 'name' });

  expect(lookup('field', 'en-US')).toBe('name');
});

test('gets an array', () => {
  addMessages('en', {
    careers: [
      {
        role: 'Role 1',
        description: 'Description 1',
      },
      {
        role: 'Role 2',
        description: 'Description 2',
      },
    ],
  });

  expect(lookup('careers', 'en-US')).toMatchInlineSnapshot(`
    Array [
      Object {
        "description": "Description 1",
        "role": "Role 1",
      },
      Object {
        "description": "Description 2",
        "role": "Role 2",
      },
    ]
  `);
});

test('caches found messages by locale', () => {
  addMessages('en', { field: 'name' });
  addMessages('pt', { field: 'nome' });

  lookup('field', 'en-US');
  lookup('field', 'pt');

  expect(lookupCache).toMatchObject({
    'en-US': { field: 'name' },
    pt: { field: 'nome' },
  });
});

test("doesn't cache falsy messages", () => {
  addMessages('en', { field: 'name' });
  addMessages('pt', { field: 'nome' });

  lookup('field_2', 'en-US');
  lookup('field_2', 'pt');

  expect(lookupCache).not.toMatchObject({
    'en-US': { field_2: 'name' },
    pt: { field_2: 'nome' },
  });
});