import { getRandomPort } from './utils';
describe('getRandomPort', () => {
it('should return a port within the specified range', () => {
const min = 5344;
const max = 5349;
const port = getRandomPort(min, max);
expect(port).toBeGreaterThanOrEqual(min);
expect(port).toBeLessThanOrEqual(max);
});
it('should exclude specified ports', () => {
const min = 5344;
const max = 5349;
const excludePorts = [5344, 5345];
// Mock Math.random to return 0 first (excluded port), then 0.5 (valid port)
const mockRandom = jest.spyOn(Math, 'random');
mockRandom.mockReturnValueOnce(0); // selects 5344, excluded
mockRandom.mockReturnValueOnce(0.5); // selects 5347, valid
const port = getRandomPort(min, max, excludePorts);
expect(port).toBe(5347);
expect(excludePorts).not.toContain(port);
jest.restoreAllMocks();
});
it('should throw an error when no ports are available', () => {
// we will allow ports between 5344 and 5346, but exclude all of them
const min = 5344;
const max = 5346;
const excludePorts = [5344, 5345, 5346];
expect(() => getRandomPort(min, max, excludePorts)).toThrow('No available ports to choose from');
});
it('should always return the only available port', () => {
// we will allow ports between 5344 and 5346, but exclude 5344 and 5345 -> 5346 is the only available port
const min = 5344;
const max = 5346;
const excludePorts = [5344, 5345];
const port = getRandomPort(min, max, excludePorts);
expect(port).toBe(5346);
});
it('should use default min and max when not provided', () => {
const port = getRandomPort();
expect(port).toBeGreaterThanOrEqual(5344);
expect(port).toBeLessThanOrEqual(5349);
});
});
