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import type { MockInstance } from 'vitest';
import { describe, expect, it, vi } from 'vitest';
import { Faker, faker, generateMersenne32Randomizer } from '../src';
import { FakerError } from '../src/errors/faker-error';
import { keys } from '../src/internal/keys';
describe('faker', () => {
it('should not log anything on startup', async () => {
const spies: MockInstance[] = keys(console)
.filter((key) => typeof console[key] === 'function')
.map((methodName) => vi.spyOn(console, methodName));
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore: Types may or may not exist, depending on whether the project was built first.
const file: unknown = await import('..');
expect(file).toBeDefined();
new Faker({ locale: { metadata: { title: '' } } });
for (const spy of spies) {
expect(spy).not.toHaveBeenCalled();
spy.mockRestore();
}
});
describe('getMetadata()', () => {
it('should return metadata for the locale', () => {
expect(faker.getMetadata()).toBeDefined();
expect(faker.getMetadata().title).toBeTypeOf('string');
// Not all properties are tested here, see locale-imports.spec.ts for full tests
});
});
describe('rawDefinitions', () => {
it('locale rawDefinition accessibility', () => {
// Metadata
expect(faker.rawDefinitions.metadata?.title).toBeDefined();
// Standard modules
expect(faker.rawDefinitions.location?.city_name).toBeDefined();
// Non-existing module
expect(faker.rawDefinitions.missing).toBeUndefined();
// Non-existing definition in a non-existing module
expect(faker.rawDefinitions.missing?.missing).toBeUndefined();
// Non-existing definition in an existing module
expect(faker.rawDefinitions.location?.missing).toBeUndefined();
});
});
describe('definitions', () => {
it('locale definition accessibility', () => {
// Metadata
expect(faker.definitions.metadata.title).toBeDefined();
// Standard modules
expect(faker.definitions.location.city_name).toBeDefined();
// Non-existing module
expect(faker.definitions.missing).toBeDefined();
// Non-existing definition in a non-existing module
expect(() => faker.definitions.missing?.missing).toThrow();
// Non-existing definition in an existing module
expect(() => faker.definitions.location.missing).toThrow();
});
});
describe('constructor()', () => {
describe('locale', () => {
it('should throw error if no locales passed', () => {
expect(() => new Faker({ locale: [] })).toThrow(
new FakerError(
'The locale option must contain at least one locale definition.'
)
);
});
});
describe('randomizer', () => {
it('should be possible to provide a custom Randomizer', () => {
const customFaker = new Faker({
locale: {},
randomizer: {
next: () => 0,
seed: () => void 0,
},
});
expect(customFaker.number.int()).toBe(0);
expect(customFaker.number.int()).toBe(0);
expect(customFaker.number.int()).toBe(0);
});
});
describe('seed', () => {
it('should be possible to provide an initial seed', () => {
const customFaker = new Faker({
locale: {},
seed: 12345,
});
expect(customFaker.number.int()).toBe(8373237378417847);
expect(customFaker.number.int()).toBe(2849657659447330);
expect(customFaker.number.int()).toBe(1656593383470774);
customFaker.seed(12345);
expect(customFaker.number.int()).toBe(8373237378417847);
expect(customFaker.number.int()).toBe(2849657659447330);
expect(customFaker.number.int()).toBe(1656593383470774);
});
});
describe('randomizer+seed', () => {
it('should take apply both the randomizer and seed', () => {
const customFaker = new Faker({
locale: {},
randomizer: generateMersenne32Randomizer(67890),
seed: 12345,
});
expect(customFaker.number.int()).toBe(8373237322874880);
expect(customFaker.number.int()).toBe(8017800868134912);
expect(customFaker.number.int()).toBe(2849657711493120);
customFaker.seed(12345); // Retry with the expected seed
expect(customFaker.number.int()).toBe(8373237322874880);
expect(customFaker.number.int()).toBe(8017800868134912);
expect(customFaker.number.int()).toBe(2849657711493120);
});
});
});
// This is only here for coverage
// The actual test is in mersenne.spec.ts
describe('seed()', () => {
it('seed()', () => {
const seed = faker.seed();
expect(seed).toBeDefined();
expect(seed).toBeTypeOf('number');
});
it('should reset the sequence when calling `seed`', () => {
const seed = faker.seed();
const num1 = faker.number.int();
const newSeed = faker.seed(seed);
const num2 = faker.number.int();
expect(num1).toBe(num2);
expect(newSeed).toBe(seed);
const num3 = faker.number.int();
expect(num1).not.toBe(num3);
});
it('seed(number)', () => {
faker.seed(1);
const actual = faker.animal.cat();
expect(actual).toBe('Korat');
});
it('seed(number[])', () => {
faker.seed([1, 2, 3]);
const actual = faker.animal.cat();
expect(actual).toBe('Oriental');
});
});
describe('defaultRefDate', () => {
it('should be a defined', () => {
expect(faker.defaultRefDate).toBeDefined();
});
it('should be a date in the very recent past', () => {
const start = Date.now();
const refDate = faker.defaultRefDate().getTime();
const end = Date.now();
expect(refDate).toBeGreaterThanOrEqual(start);
expect(refDate).toBeLessThanOrEqual(end);
});
});
});
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