backend-template/packages/cli/test/index.test.ts

import { describe, it, expect, vi, beforeAll } from 'vitest';
import { Cli, createCli } from '../src/cli';
import { addCommands } from '../src/commands';
import { AdderServiceImpl, InvalidArgumentTypeError, ArgumentOutOfRangeError } from '../src/modules/adder';

vi.mock('process');

describe('blah', () => {
	let cli: Cli;
	beforeAll(() => {
		cli = createCli();
		addCommands(cli);
	});

	it('returns result when successful', async () => {
		const response = await cli.test().run(['add', '1', '2']);
		expect(response.exitCode).toBe(0);
  });

	it('returns error when given invalid inputs', async () => {
		vi.spyOn(AdderServiceImpl.prototype, 'addNumbers').mockImplementationOnce(() => {
			throw new InvalidArgumentTypeError('Invalid input');
		});

		const response = await cli.test().run(['add', '1', '2']);
		expect(response.exitCode).toBe(-1);
	});

	it('returns error when given out-of-range inputs', async () => {
		vi.spyOn(AdderServiceImpl.prototype, 'addNumbers').mockImplementationOnce(() => {
			throw new ArgumentOutOfRangeError('Out of range');
		});

		const response = await cli.test().run(['add', '1', '2']);
		expect(response.exitCode).toBe(-2);
	});

	it('returns error when an unexpected error occurs', async () => {
		vi.spyOn(AdderServiceImpl.prototype, 'addNumbers').mockImplementationOnce(() => {
			throw new Error('Unexpected error');
		});

		const response = await cli.test().run(['add', '1', '2']);
		expect(response.exitCode).toBe(-3);
	});

	it('returns error when given insufficient arguments', async () => {
		const response = await cli.test().run(['add', '1']);
		expect(response.exitCode).toBe(-1);
	});

	describe('on interactive mode', () => {
		it('prompts values for insufficient arguments', async () => {
			const response = await cli
				.test()
				.promptValue({
					a: '1',
					b: '2',
				})
				.run(['add', '-i']);
			expect(response.exitCode).not.toBe(-1);
		});
	});
});