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import type { MockInstance } from 'vitest';
import { describe, expect, it, vi } from 'vitest';
import { generateMersenne32Randomizer, SimpleFaker, simpleFaker } from '../src';
import { keys } from '../src/internal/keys';
describe('simpleFaker', () => {
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));
// Using import() requires types being build but the CI / TS-Check runs without them.
const { simpleFaker: importedSimpleFaker } = await import('..');
expect(importedSimpleFaker).toBeDefined();
expect(new SimpleFaker()).toBeDefined();
for (const spy of spies) {
expect(spy).not.toHaveBeenCalled();
spy.mockRestore();
}
});
describe('constructor()', () => {
describe('randomizer', () => {
it('should be possible to provide a custom Randomizer', () => {
const customFaker = new SimpleFaker({
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 SimpleFaker({
seed: 12345,
});
expect(customFaker.number.int()).toBe(8373237378417847);
expect(customFaker.number.int()).toBe(2849657659447330);
expect(customFaker.number.int()).toBe(1656593383470774);
customFaker.seed(12345); // Retry with the expected seed
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 SimpleFaker({
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 = simpleFaker.seed();
expect(seed).toBeDefined();
expect(seed).toBeTypeOf('number');
});
it('should reset the sequence when calling `seed`', () => {
const seed = simpleFaker.seed();
const num1 = simpleFaker.number.int();
const newSeed = simpleFaker.seed(seed);
const num2 = simpleFaker.number.int();
expect(num1).toBe(num2);
expect(newSeed).toBe(seed);
const num3 = simpleFaker.number.int();
expect(num1).not.toBe(num3);
});
it('seed(number)', () => {
simpleFaker.seed(1);
const actual = simpleFaker.string.uuid();
expect(actual).toMatchInlineSnapshot(
'"6b042125-686a-43e0-8a68-23cf5bee102e"'
);
});
it('seed(number[])', () => {
simpleFaker.seed([1, 2, 3]);
const actual = simpleFaker.string.uuid();
expect(actual).toMatchInlineSnapshot(
'"9e7e0e9f-9e8e-4408-b5b1-8002907d7dd6"'
);
});
});
describe('defaultRefDate', () => {
it('should be a defined', () => {
expect(simpleFaker.defaultRefDate).toBeDefined();
});
it('should be a date in the very recent past', () => {
const start = Date.now();
const refDate = simpleFaker.defaultRefDate().getTime();
const end = Date.now();
expect(refDate).toBeGreaterThanOrEqual(start);
expect(refDate).toBeLessThanOrEqual(end);
});
});
});
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