feat: Sprint 2 — test taking + results

Backend:
- Models: TestAttempt, AttemptAnswer (migration 002)
- POST /api/attempts: start attempt, shuffle questions/answers,
  hide is_correct, expose is_multiple for UI hints
- POST /api/attempts/{id}/submit: save answers, calculate score,
  strict matching (selected == correct), return full result
- GET /api/attempts/{id}/result: fetch saved result
- Register attempts router in main.py

Frontend:
- api/attempts.ts: types + API functions
- TestTake page: one question at a time, progress bar, timer
  with auto-submit, back navigation controlled by test setting,
  radio/checkbox based on is_multiple
- AttemptResult page: score, pass/fail, per-question breakdown
  with correct/selected/missed answer highlighting
- App.tsx: add /tests/:testId/take and /attempts/:id/result routes
- TestDetail: add "Пройти тест" button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/attempts.py

@@ -0,0 +1,223 @@
+import random
+from datetime import datetime, timezone
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
+
+from app.database import get_db
+from app.models.attempt import AttemptAnswer, TestAttempt
+from app.models.test import Question, Test
+from app.schemas.attempt import (
+    AttemptResult,
+    AttemptStart,
+    AttemptStarted,
+    AttemptSubmitDto,
+    AnswerForTest,
+    AnswerResult,
+    QuestionForTest,
+    QuestionResult,
+)
+
+router = APIRouter(prefix="/api/attempts", tags=["attempts"])
+
+
+@router.post("", response_model=AttemptStarted, status_code=201)
+async def start_attempt(data: AttemptStart, db: AsyncSession = Depends(get_db)):
+    """Начать попытку прохождения теста. Возвращает вопросы в случайном порядке без правильных ответов."""
+
+    result = await db.execute(
+        select(Test)
+        .options(selectinload(Test.questions).selectinload(Question.answers))
+        .where(Test.id == data.test_id, Test.is_active == True)
+    )
+    test = result.scalar_one_or_none()
+    if not test:
+        raise HTTPException(status_code=404, detail="Тест не найден")
+
+    attempt = TestAttempt(test_id=test.id, status="in_progress")
+    db.add(attempt)
+    await db.commit()
+    await db.refresh(attempt)
+
+    # Перемешиваем вопросы и ответы случайно
+    questions_shuffled = list(test.questions)
+    random.shuffle(questions_shuffled)
+
+    questions_for_test = []
+    for q in questions_shuffled:
+        correct_count = sum(1 for a in q.answers if a.is_correct)
+        answers_shuffled = list(q.answers)
+        random.shuffle(answers_shuffled)
+        questions_for_test.append(
+            QuestionForTest(
+                id=q.id,
+                text=q.text,
+                is_multiple=correct_count > 1,
+                answers=[AnswerForTest(id=a.id, text=a.text) for a in answers_shuffled],
+            )
+        )
+
+    return AttemptStarted(
+        id=attempt.id,
+        test_id=test.id,
+        test_title=test.title,
+        test_description=test.description,
+        started_at=attempt.started_at,
+        time_limit=test.time_limit,
+        allow_navigation_back=test.allow_navigation_back,
+        questions=questions_for_test,
+    )
+
+
+@router.post("/{attempt_id}/submit", response_model=AttemptResult)
+async def submit_attempt(
+    attempt_id: int, data: AttemptSubmitDto, db: AsyncSession = Depends(get_db)
+):
+    """Завершить попытку: сохранить ответы, подсчитать результат."""
+
+    result = await db.execute(
+        select(TestAttempt)
+        .where(TestAttempt.id == attempt_id, TestAttempt.status == "in_progress")
+    )
+    attempt = result.scalar_one_or_none()
+    if not attempt:
+        raise HTTPException(status_code=404, detail="Попытка не найдена или уже завершена")
+
+    # Загружаем тест с вопросами и ответами
+    test_result = await db.execute(
+        select(Test)
+        .options(selectinload(Test.questions).selectinload(Question.answers))
+        .where(Test.id == attempt.test_id)
+    )
+    test = test_result.scalar_one()
+
+    # Сохраняем выбранные ответы
+    submitted = {qa.question_id: set(qa.answer_ids) for qa in data.answers}
+
+    for qa in data.answers:
+        for answer_id in qa.answer_ids:
+            db.add(AttemptAnswer(
+                attempt_id=attempt.id,
+                question_id=qa.question_id,
+                answer_id=answer_id,
+            ))
+
+    # Подсчёт результата
+    correct_count = 0
+    question_results = []
+
+    for question in test.questions:
+        correct_ids = {a.id for a in question.answers if a.is_correct}
+        selected_ids = submitted.get(question.id, set())
+        is_correct = selected_ids == correct_ids
+
+        if is_correct:
+            correct_count += 1
+
+        question_results.append(
+            QuestionResult(
+                id=question.id,
+                text=question.text,
+                is_answered_correctly=is_correct,
+                answers=[
+                    AnswerResult(
+                        id=a.id,
+                        text=a.text,
+                        is_correct=a.is_correct,
+                        is_selected=a.id in selected_ids,
+                    )
+                    for a in question.answers
+                ],
+            )
+        )
+
+    total = len(test.questions)
+    score = round((correct_count / total) * 100, 1) if total > 0 else 0.0
+    passed = score >= test.passing_score
+    finished_at = datetime.now(timezone.utc)
+
+    attempt.finished_at = finished_at
+    attempt.score = score
+    attempt.passed = passed
+    attempt.correct_count = correct_count
+    attempt.total_count = total
+    attempt.status = "finished"
+
+    await db.commit()
+
+    return AttemptResult(
+        id=attempt.id,
+        test_id=test.id,
+        test_title=test.title,
+        started_at=attempt.started_at,
+        finished_at=finished_at,
+        score=score,
+        passed=passed,
+        passing_score=test.passing_score,
+        correct_count=correct_count,
+        total_count=total,
+        questions=question_results,
+    )
+
+
+@router.get("/{attempt_id}/result", response_model=AttemptResult)
+async def get_result(attempt_id: int, db: AsyncSession = Depends(get_db)):
+    """Получить результат завершённой попытки."""
+
+    result = await db.execute(
+        select(TestAttempt)
+        .options(selectinload(TestAttempt.answers).selectinload(AttemptAnswer.answer))
+        .where(TestAttempt.id == attempt_id, TestAttempt.status == "finished")
+    )
+    attempt = result.scalar_one_or_none()
+    if not attempt:
+        raise HTTPException(status_code=404, detail="Результат не найден")
+
+    test_result = await db.execute(
+        select(Test)
+        .options(selectinload(Test.questions).selectinload(Question.answers))
+        .where(Test.id == attempt.test_id)
+    )
+    test = test_result.scalar_one()
+
+    # Восстанавливаем выбранные ответы из БД
+    selected_by_question: dict[int, set[int]] = {}
+    for aa in attempt.answers:
+        selected_by_question.setdefault(aa.question_id, set()).add(aa.answer_id)
+
+    question_results = []
+    for question in test.questions:
+        correct_ids = {a.id for a in question.answers if a.is_correct}
+        selected_ids = selected_by_question.get(question.id, set())
+        question_results.append(
+            QuestionResult(
+                id=question.id,
+                text=question.text,
+                is_answered_correctly=selected_ids == correct_ids,
+                answers=[
+                    AnswerResult(
+                        id=a.id,
+                        text=a.text,
+                        is_correct=a.is_correct,
+                        is_selected=a.id in selected_ids,
+                    )
+                    for a in question.answers
+                ],
+            )
+        )
+
+    return AttemptResult(
+        id=attempt.id,
+        test_id=test.id,
+        test_title=test.title,
+        started_at=attempt.started_at,
+        finished_at=attempt.finished_at,
+        score=attempt.score,
+        passed=attempt.passed,
+        passing_score=test.passing_score,
+        correct_count=attempt.correct_count,
+        total_count=attempt.total_count,
+        questions=question_results,
+    )

backend/app/main.py

@@ -1,7 +1,7 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from app.api import tests
+from app.api import attempts, tests
 
 app = FastAPI(
     title="QA Test App API",
@@ -19,6 +19,7 @@ app.add_middleware(
 )
 
 app.include_router(tests.router)
+app.include_router(attempts.router)
 
 
 @app.get("/api/health")

backend/app/models/attempt.py

@@ -0,0 +1,49 @@
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, Float, ForeignKey, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class TestAttempt(Base):
+    __tablename__ = "test_attempts"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    test_id: Mapped[int] = mapped_column(Integer, ForeignKey("tests.id"), nullable=False)
+    started_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    score: Mapped[float | None] = mapped_column(Float, nullable=True)  # процент 0–100
+    passed: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
+    correct_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    total_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    # in_progress | finished
+    status: Mapped[str] = mapped_column(String(20), default="in_progress", nullable=False)
+
+    test: Mapped["Test"] = relationship("Test")  # type: ignore[name-defined]
+    answers: Mapped[list["AttemptAnswer"]] = relationship(
+        "AttemptAnswer", back_populates="attempt", cascade="all, delete-orphan"
+    )
+
+
+class AttemptAnswer(Base):
+    """Одна запись = один выбранный вариант ответа сотрудника."""
+
+    __tablename__ = "attempt_answers"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    attempt_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("test_attempts.id"), nullable=False
+    )
+    question_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("questions.id"), nullable=False
+    )
+    answer_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("answers.id"), nullable=False
+    )
+
+    attempt: Mapped["TestAttempt"] = relationship("TestAttempt", back_populates="answers")
+    answer: Mapped["Answer"] = relationship("Answer")  # type: ignore[name-defined]

backend/app/schemas/attempt.py

@@ -0,0 +1,89 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+# ── Начало попытки ──────────────────────────────────────────
+
+class AttemptStart(BaseModel):
+    test_id: int
+
+
+class AnswerForTest(BaseModel):
+    """Вариант ответа без поля is_correct — не раскрываем правильные ответы."""
+    id: int
+    text: str
+
+    model_config = {"from_attributes": True}
+
+
+class QuestionForTest(BaseModel):
+    id: int
+    text: str
+    is_multiple: bool  # True = несколько правильных ответов → показываем чекбоксы
+    answers: list[AnswerForTest]  # перемешаны случайно
+
+    model_config = {"from_attributes": True}
+
+
+class AttemptStarted(BaseModel):
+    """Возвращается после старта попытки."""
+    id: int
+    test_id: int
+    test_title: str
+    test_description: Optional[str]
+    started_at: datetime
+    time_limit: Optional[int]          # минуты, из теста
+    allow_navigation_back: bool        # из теста
+    questions: list[QuestionForTest]   # перемешаны случайно
+
+    model_config = {"from_attributes": True}
+
+
+# ── Сдача попытки ────────────────────────────────────────────
+
+class QuestionAnswer(BaseModel):
+    """Ответы сотрудника на один вопрос."""
+    question_id: int
+    answer_ids: list[int]  # выбранные варианты (может быть пустым)
+
+
+class AttemptSubmitDto(BaseModel):
+    answers: list[QuestionAnswer]
+
+
+# ── Результат ────────────────────────────────────────────────
+
+class AnswerResult(BaseModel):
+    id: int
+    text: str
+    is_correct: bool    # правильный ли ответ вообще
+    is_selected: bool   # выбрал ли его сотрудник
+
+    model_config = {"from_attributes": True}
+
+
+class QuestionResult(BaseModel):
+    id: int
+    text: str
+    is_answered_correctly: bool  # вся комбинация ответов верна
+    answers: list[AnswerResult]
+
+    model_config = {"from_attributes": True}
+
+
+class AttemptResult(BaseModel):
+    id: int
+    test_id: int
+    test_title: str
+    started_at: datetime
+    finished_at: datetime
+    score: float         # процент правильных ответов
+    passed: bool         # преодолён ли порог зачёта
+    passing_score: int   # порог из теста
+    correct_count: int
+    total_count: int
+    questions: list[QuestionResult]
+
+    model_config = {"from_attributes": True}