test: add tests and questions service tests
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230
tests/services/tests.service.test.ts
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230
tests/services/tests.service.test.ts
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import { describe, it, expect, vi, beforeEach } from 'vitest';
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import { TestsService } from '../../src/services/tests/tests.service.js';
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import {
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createMockDb,
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selectChain,
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selectChainOrdered,
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selectChainWhere,
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insertChain,
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updateChain,
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updateChainReturning,
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} from '../test-utils.js';
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const mockQuestions = [
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{
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questionBankId: 'qb-1',
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type: 'single_choice' as const,
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questionText: 'What is 2+2?',
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options: [{ key: 'a', text: '4' }, { key: 'b', text: '3' }],
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correctAnswer: 'a',
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explanation: 'Basic math',
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},
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];
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describe('TestsService', () => {
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let mockDb: ReturnType<typeof createMockDb>;
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let mockQuestionService: { getQuestionsForTest: ReturnType<typeof vi.fn> };
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let testsService: TestsService;
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beforeEach(() => {
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vi.clearAllMocks();
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mockDb = createMockDb();
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mockQuestionService = {
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getQuestionsForTest: vi.fn().mockResolvedValue(mockQuestions),
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};
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testsService = new TestsService(mockDb as never, mockQuestionService as never);
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});
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describe('createTest', () => {
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it('creates a test with questions from QuestionService', async () => {
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const mockTest = {
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id: 'test-1',
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userId: 'user-1',
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stack: 'js',
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level: 'beginner',
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questionCount: 1,
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mode: 'fixed',
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status: 'in_progress',
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score: null,
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startedAt: new Date(),
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finishedAt: null,
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timeLimitSeconds: null,
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};
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const mockTqRows = [
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{
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id: 'tq-1',
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testId: 'test-1',
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questionBankId: 'qb-1',
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orderNumber: 1,
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type: 'single_choice',
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questionText: 'What is 2+2?',
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options: [{ key: 'a', text: '4' }],
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correctAnswer: 'a',
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explanation: 'Basic math',
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userAnswer: null,
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isCorrect: null,
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answeredAt: null,
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},
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];
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(mockDb.insert as ReturnType<typeof vi.fn>)
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.mockReturnValueOnce(insertChain([mockTest]))
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.mockReturnValueOnce(insertChain([]));
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(mockDb.select as ReturnType<typeof vi.fn>).mockReturnValueOnce(
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selectChainOrdered(mockTqRows)
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);
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const result = await testsService.createTest('user-1', {
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stack: 'js',
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level: 'beginner',
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questionCount: 1,
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});
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expect(result.id).toBe('test-1');
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expect(result.questions).toHaveLength(1);
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expect(mockQuestionService.getQuestionsForTest).toHaveBeenCalledWith(
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'user-1',
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'js',
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'beginner',
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1
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);
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});
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it('throws when questionCount is out of range', async () => {
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await expect(
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testsService.createTest('user-1', {
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stack: 'js',
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level: 'beginner',
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questionCount: 0,
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})
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).rejects.toMatchObject({ code: 'BAD_REQUEST' });
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await expect(
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testsService.createTest('user-1', {
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stack: 'js',
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level: 'beginner',
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questionCount: 51,
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})
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).rejects.toMatchObject({ code: 'BAD_REQUEST' });
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});
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});
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describe('answerQuestion', () => {
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it('returns updated question snapshot when answer is correct', async () => {
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const mockTest = { id: 't-1', userId: 'user-1', status: 'in_progress' };
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const mockTq = {
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id: 'tq-1',
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testId: 't-1',
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correctAnswer: 'a',
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userAnswer: null,
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questionBankId: 'qb-1',
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orderNumber: 1,
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type: 'single_choice',
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questionText: 'Q?',
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options: [{ key: 'a', text: 'A' }],
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explanation: 'exp',
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};
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const updatedTq = { ...mockTq, userAnswer: 'a', isCorrect: true, answeredAt: new Date() };
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(mockDb.select as ReturnType<typeof vi.fn>)
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.mockReturnValueOnce(selectChain([mockTest]))
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.mockReturnValueOnce(selectChain([mockTq]));
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(mockDb.update as ReturnType<typeof vi.fn>).mockReturnValueOnce(
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updateChainReturning([updatedTq])
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);
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const result = await testsService.answerQuestion('user-1', 't-1', 'tq-1', 'a');
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expect(result.isCorrect).toBe(true);
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expect(result.userAnswer).toBe('a');
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});
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it('throws when test not found', async () => {
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(mockDb.select as ReturnType<typeof vi.fn>).mockReturnValueOnce(selectChain([]));
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await expect(
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testsService.answerQuestion('user-1', 'bad-id', 'tq-1', 'a')
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).rejects.toMatchObject({ code: 'NOT_FOUND' });
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});
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it('throws when test is already finished', async () => {
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(mockDb.select as ReturnType<typeof vi.fn>).mockReturnValueOnce(
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selectChain([{ id: 't-1', userId: 'user-1', status: 'completed' }])
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);
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await expect(
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testsService.answerQuestion('user-1', 't-1', 'tq-1', 'a')
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).rejects.toMatchObject({ code: 'TEST_ALREADY_FINISHED' });
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});
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});
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describe('finishTest', () => {
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it('throws when there are unanswered questions', async () => {
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const mockTest = { id: 't-1', userId: 'user-1', status: 'in_progress', stack: 'js', level: 'beginner' };
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const mockQuestionsWithUnanswered = [
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{ id: 'tq-1', testId: 't-1', userAnswer: 'a', isCorrect: true },
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{ id: 'tq-2', testId: 't-1', userAnswer: null, isCorrect: null },
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];
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(mockDb.select as ReturnType<typeof vi.fn>)
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.mockReturnValueOnce(selectChain([mockTest]))
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.mockReturnValueOnce(selectChainWhere(mockQuestionsWithUnanswered));
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await expect(
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testsService.finishTest('user-1', 't-1')
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).rejects.toMatchObject({ code: 'NO_ANSWERS' });
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});
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});
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describe('getById', () => {
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it('returns null when test not found', async () => {
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(mockDb.select as ReturnType<typeof vi.fn>).mockReturnValueOnce(selectChain([]));
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const result = await testsService.getById('user-1', 'bad-id');
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expect(result).toBeNull();
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});
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it('returns test with questions when found', async () => {
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const mockTest = {
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id: 't-1',
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userId: 'user-1',
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stack: 'js',
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level: 'beginner',
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questionCount: 2,
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mode: 'fixed',
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status: 'in_progress',
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score: null,
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startedAt: new Date(),
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finishedAt: null,
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timeLimitSeconds: null,
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};
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const mockTqRows = [
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{ id: 'tq-1', testId: 't-1', orderNumber: 1, questionBankId: 'qb-1', type: 'single_choice', questionText: 'Q1', options: [], correctAnswer: 'a', explanation: 'e', userAnswer: null, isCorrect: null, answeredAt: null },
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];
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(mockDb.select as ReturnType<typeof vi.fn>)
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.mockReturnValueOnce(selectChain([mockTest]))
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.mockReturnValueOnce(selectChainOrdered(mockTqRows));
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const result = await testsService.getById('user-1', 't-1');
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expect(result).not.toBeNull();
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expect(result!.id).toBe('t-1');
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expect(result!.questions).toHaveLength(1);
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});
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});
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describe('getHistory', () => {
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it('returns paginated test history', async () => {
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const mockTests = [
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{ id: 't-1', userId: 'user-1', stack: 'js', level: 'beginner', questionCount: 1, mode: 'fixed', status: 'completed', score: 100, startedAt: new Date(), finishedAt: new Date(), timeLimitSeconds: null },
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];
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const mockTqRows = [];
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(mockDb.select as ReturnType<typeof vi.fn>)
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.mockReturnValueOnce(selectChainOrdered(mockTests))
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.mockReturnValueOnce(selectChainOrdered(mockTqRows));
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const result = await testsService.getHistory('user-1', { limit: 10, offset: 0 });
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expect(result.tests).toHaveLength(1);
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expect(result.total).toBe(1);
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});
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});
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});
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