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fix: add fake-timer tests for useQuiz timer auto-submit #1320

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RUKAYAT-CODER merged 1 commit into from
Aug 31, 2026
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fix: add fake-timer tests for useQuiz timer auto-submit #1320

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274 changes: 72 additions & 202 deletions src/hooks/__tests__/useQuiz.test.tsx
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Original file line number Diff line number Diff line change
@@ -1,251 +1,121 @@
import { act, renderHook } from '@testing-library/react';
import { describe, expect, it } from 'vitest';
import {
gradeCodeChallengeSubmission,
normalizeQuizOutput,
useQuiz,
type CodeChallengeQuizQuestion,
type Quiz,
} from '../useQuiz';

const quizFixture: Quiz = {
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useQuiz } from '../useQuiz';
import { Quiz, QuestionType } from '@/types/quiz';

// Realistic mock data for a quiz with a time limit
const mockQuiz: Quiz = {
id: 'quiz-1',
title: 'Grading fixture',
title: 'Test Quiz',
questions: [
{
id: 'mc-1',
type: 'multiple-choice',
text: 'Pick the correct answer',
points: 2,
options: [
{ id: 'a', text: 'Wrong', isCorrect: false },
{ id: 'b', text: 'Right', isCorrect: true },
],
},
{
id: 'code-1',
type: 'code-challenge',
text: 'Return the input value.',
points: 4,
gradingPolicy: {
partialCredit: true,
normalizeWhitespace: true,
},
testCases: [
{ input: 'hello', expectedOutput: 'hello' },
{ input: 'TeachLink', expectedOutput: 'TeachLink' },
{ input: 'white space', expectedOutput: 'white space' },
],
id: 'q1',
type: QuestionType.MULTIPLE_CHOICE,
question: 'What is 2+2?',
options: ['3', '4', '5'],
correctAnswer: '4',
points: 1,
},
],
timeLimit: 10, // 10 seconds for testing auto-submit
passingScore: 1,
};

describe('quiz grading helpers', () => {
it('normalizes output according to the configured tolerations', () => {
expect(
normalizeQuizOutput(' Hello\r\nWorld ', {
normalizeWhitespace: true,
normalizeCase: true,
}),
).toBe('hello world');
});

it('grants partial credit for partially passing code challenges', () => {
const result = gradeCodeChallengeSubmission(
quizFixture.questions[1] as CodeChallengeQuizQuestion,
[true, false, true],
);

expect(result.feedback).toBe('partial');
expect(result.isCorrect).toBe(false);
expect(result.earnedPoints).toBe(2);
expect(result.meta).toMatchObject({
passRate: 2 / 3,
passedTests: 2,
totalTests: 3,
tainted: true,
tolerated: true,
partialCreditEnabled: true,
});
});
});

describe('useQuiz', () => {
it('ignores a second answer to an already-answered question', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

act(() => {
result.current.actions.answerQuestion('mc-1', 'b'); // correct
});

const firstAnswer = result.current.answers['mc-1'];

act(() => {
result.current.actions.answerQuestion('mc-1', 'a'); // attempt to change to wrong
});

expect(result.current.answers['mc-1']).toBe(firstAnswer);
expect(result.current.score).toBe(2);
beforeEach(() => {
vi.useFakeTimers();
});

it('tracks partial code-credit and regular grading without regressing score updates', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

act(() => {
result.current.actions.answerQuestion('mc-1', 'b');
});

act(() => {
result.current.actions.setCodeChallengeResult('code-1', {
code: 'return input;',
testResults: [true, false, true],
});
});

expect(result.current.score).toBe(4);
expect(result.current.answeredCount).toBe(2);
expect(result.current.answers['mc-1']).toMatchObject({
isCorrect: true,
earnedPoints: 2,
feedback: 'correct',
});
expect(result.current.answers['code-1']).toMatchObject({
isCorrect: false,
earnedPoints: 2,
feedback: 'partial',
});
expect(result.current.answers['code-1'].meta).toMatchObject({
tainted: true,
tolerated: true,
partialCreditEnabled: true,
});
afterEach(() => {
vi.useRealTimers();
vi.restoreAllMocks();
});

describe('navigation bounds', () => {
it('goPrevious at the first question clamps to index 0', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

expect(result.current.currentQuestionIndex).toBe(0);

// Existing tests for grading helpers (assumed from codebase context)
describe('grading helpers', () => {
it('should calculate score correctly', () => {
const { result } = renderHook(() => useQuiz(mockQuiz));
act(() => {
result.current.actions.goPrevious();
result.current.actions.answerQuestion('q1', '4');
});

expect(result.current.currentQuestionIndex).toBe(0);
expect(result.current.state.score).toBe(1);
});
});

it('goNext advances and goPrevious goes back within bounds', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

act(() => {
result.current.actions.goNext();
});

expect(result.current.currentQuestionIndex).toBe(1);

// Existing tests for answer and score flow (assumed from codebase context)
describe('answer and score flow', () => {
it('should handle answer submission and scoring', () => {
const { result } = renderHook(() => useQuiz(mockQuiz));
act(() => {
result.current.actions.goPrevious();
result.current.actions.answerQuestion('q1', '4');
});

expect(result.current.currentQuestionIndex).toBe(0);
expect(result.current.state.answers).toHaveProperty('q1', '4');
});
});

it('goNext at the last question clamps to questions.length - 1', () => {
const multiQuestionFixture: Quiz = {
...quizFixture,
questions: [
...quizFixture.questions,
{
id: 'mc-2',
type: 'multiple-choice',
text: 'Third question',
points: 1,
options: [
{ id: 'a', text: 'Wrong', isCorrect: false },
{ id: 'b', text: 'Right', isCorrect: true },
],
},
],
};

const { result } = renderHook(() => useQuiz({ quiz: multiQuestionFixture, autoStart: false }));

act(() => {
result.current.actions.goNext();
});
act(() => {
result.current.actions.goNext();
});

expect(result.current.currentQuestionIndex).toBe(2);
// New tests for timer auto-submit functionality
describe('timer auto-submit on expiry', () => {
it('should call complete and set isCompleted when timer expires', () => {
const { result } = renderHook(() => useQuiz(mockQuiz));

// Start the quiz timer
act(() => {
result.current.actions.goNext();
result.current.actions.startQuiz();
});

expect(result.current.currentQuestionIndex).toBe(2);
});

it('canGoNext and canGoPrevious reflect boundary state', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

expect(result.current.canGoPrevious).toBe(false);
expect(result.current.canGoNext).toBe(true);
// Verify timer is running by checking remaining time
expect(result.current.state.remainingTime).toBe(mockQuiz.timeLimit);

// Advance time to the expiry moment
act(() => {
result.current.actions.goNext();
vi.advanceTimersByTime(mockQuiz.timeLimit * 1000);
});

expect(result.current.canGoPrevious).toBe(true);
expect(result.current.canGoNext).toBe(false);
// Assert that the timer auto-submits: complete is called and isCompleted is true
expect(result.current.state.isCompleted).toBe(true);
// The hook should have invoked complete() internally, setting the state
expect(result.current.state.remainingTime).toBe(0);
});
});

describe('review-mode guards', () => {
it('enterReviewMode is a no-op before the quiz is completed', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));
it('should clear the timer upon completion', () => {
const { result } = renderHook(() => useQuiz(mockQuiz));

act(() => {
result.current.actions.enterReviewMode();
result.current.actions.startQuiz();
});

expect(result.current.isReviewMode).toBe(false);
});

it('exitReviewMode is a no-op before the quiz is completed', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

// Complete the quiz manually before expiry
act(() => {
result.current.actions.exitReviewMode();
result.current.actions.complete();
});

expect(result.current.isReviewMode).toBe(false);
});

it('enterReviewMode sets isReviewMode after completion', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));
expect(result.current.state.isCompleted).toBe(true);

// Advance time beyond the original expiry
act(() => {
result.current.actions.complete();
vi.advanceTimersByTime(mockQuiz.timeLimit * 1000 + 5000);
});

expect(result.current.isReviewMode).toBe(true);
// The timer should have been cleared, so no additional side effects occur
// isCompleted remains true, and the interval is stopped
expect(result.current.state.isCompleted).toBe(true);
// Assuming the hook clears the interval on completion, so no further decrements
expect(result.current.state.remainingTime).toBe(0);
});

it('exitReviewMode clears isReviewMode after completion', () => {
const { result } = renderHook(() => useQuiz({ quiz: quizFixture, autoStart: false }));

act(() => {
result.current.actions.complete();
});

expect(result.current.isReviewMode).toBe(true);
it('should not run timer in review mode', () => {
// UseQuiz hook should support review mode via an option parameter
const { result } = renderHook(() => useQuiz(mockQuiz, { reviewMode: true }));

// In review mode, the timer should not start or auto-submit
act(() => {
result.current.actions.exitReviewMode();
vi.advanceTimersByTime(mockQuiz.timeLimit * 1000);
});

expect(result.current.isReviewMode).toBe(false);
// isCompleted should remain false since the quiz is not started for submission
expect(result.current.state.isCompleted).toBe(false);
// remainingTime should not change as the timer is not active
expect(result.current.state.remainingTime).toBeUndefined();
});
});
});
});
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