Pipelinen parannuksia building blockeilla

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+# 6 — QA (qa) — test_main.py
+
+**Malli:** `qwen-coder`
+
+## System Prompt
+
+```
+You are a QA engineer responsible for code review and automated testing.
+
+CODE REVIEW CHECKLIST:
+1. IMPORTS: Every "from X import Y" must match an actual export in file X
+2. NAMES: Pydantic schemas (UserCreate) must not shadow SQLAlchemy models (User)
+3. TYPES: All function parameters have type hints, return types specified
+4. ERRORS: Every db query that can return None has a 404 check
+5. RESOURCES: Database session uses yield+finally pattern (no leaks)
+6. SECURITY: No raw SQL, no hardcoded secrets, inputs validated via Pydantic
+7. ENDPOINTS: All CRUD operations exist (POST/GET/GET-by-id/PUT/DELETE)
+8. MODELS: Pydantic Config has from_attributes=True, uses model_dump() not dict()
+9. COMPLETENESS: No placeholder comments, no "TODO", no "pass" in handlers
+
+WHEN REVIEWING:
+- If all checks pass: respond "LGTM"
+- If issues found: list each as "ISSUE: filename.py: description"
+- Be specific and actionable, not vague
+
+WHEN WRITING TESTS:
+- pytest as the test framework
+- FastAPI TestClient for API endpoint testing
+- SQLAlchemy in-memory SQLite for test database isolation
+- Test all CRUD: create (201), list (200), get by id (200/404), update (200), delete (204)
+- ALWAYS: from fastapi.testclient import TestClient
+```
+
+## Syöte
+
+```
+You are a QA engineer responsible for code review and automated testing.
+
+CODE REVIEW CHECKLIST:
+1. IMPORTS: Every "from X import Y" must match an actual export in file X
+2. NAMES: Pydantic schemas (UserCreate) must not shadow SQLAlchemy models (User)
+3. TYPES: All function parameters have type hints, return types specified
+4. ERRORS: Every db query that can return None has a 404 check
+5. RESOURCES: Database session uses yield+finally pattern (no leaks)
+6. SECURITY: No raw SQL, no hardcoded secrets, inputs validated via Pydantic
+7. ENDPOINTS: All CRUD operations exist (POST/GET/GET-by-id/PUT/DELETE)
+8. MODELS: Pydantic Config has from_attributes=True, uses model_dump() not dict()
+9. COMPLETENESS: No placeholder comments, no "TODO", no "pass" in handlers
+
+WHEN REVIEWING:
+- If all checks pass: respond "LGTM"
+- If issues found: list each as "ISSUE: filename.py: description"
+- Be specific and actionable, not vague
+
+WHEN WRITING TESTS:
+- pytest as the test framework
+- FastAPI TestClient for API endpoint testing
+- SQLAlchemy in-memory SQLite for test database isolation
+- Test all CRUD: create (201), list (200), get by id (200/404), update (200), delete (204)
+- ALWAYS: from fastapi.testclient import TestClient
+
+Write pytest tests for this project:
+
+--- models.py ---
+from sqlalchemy import create_engine, Column, Integer, String, Date, Enum
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+DATABASE_URL = "sqlite:///./todo.db"
+engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+class Todo(Base):
+    __tablename__ = "todos"
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(100), nullable=False)
+    description = Column(String(500))
+    due_date = Column(Date, nullable=False)
+    status = Column(Enum('pending', 'completed'), default='pending')
+
+--- schemas.py ---
+from pydantic import BaseModel
+
+class TodoCreate(BaseModel):
+    title: str
+    description: str | None = None
+    due_date: date
+    status: str = 'pending'
+
+class TodoResponse(TodoCreate):
+    id: int
+
+    class Config:
+        from_attributes = True
+
+--- main.py ---
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+from models import Base, engine, SessionLocal, Todo
+from schemas import TodoCreate, TodoResponse
+
+Base.metadata.create_all(bind=engine)
+app = FastAPI()
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+@app.post("/todos/", response_model=TodoResponse, status_code=201)
+def create_todo(todo: TodoCreate, db: Session = Depends(get_db)):
+    db_todo = Todo(**todo.model_dump())
+    db.add(db_todo)
+    db.commit()
+    db.refresh(db_todo)
+    return db_todo
+
+@app.get("/todos/", response_model=list[TodoResponse])
+def list_todos(status: str | None = None, db: Session = Depends(get_db)):
+    if status:
+        query = db.query(Todo).filter_by(status=status)
+    else:
+        query = db.query(Todo)
+    return query.all()
+
+@app.get("/todos/{todo_id}", response_model=TodoResponse)
+def get_todo(todo_id: int, db: Session = Depends(get_db)):
+    todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    return todo
+
+@app.put("/todos/{todo_id}", response_model=TodoResponse)
+def update_todo(todo_id: int, todo: TodoCreate, db: Session = Depends(get_db)):
+    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not db_todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    for key, value in todo.model_dump().items():
+        setattr(db_todo, key, value)
+    db.commit()
+    db.refresh(db_todo)
+    return db_todo
+
+@app.delete("/todos/{todo_id}", status_code=204)
+def delete_todo(todo_id: int, db: Session = Depends(get_db)):
+    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not db_todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    db.delete(db_todo)
+    db.commit()
+
+--- pyproject.toml ---
+[project]
+name = "todo-sovellus"
+version = "0.1.0"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi",
+    "uvicorn[standard]",
+    "sqlalchemy",
+]
+
+[project.scripts]
+dev = "uvicorn main:app --reload"
+
+Write a complete test_main.py file with TestClient.
+```
+
+## Tulos
+
+```
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine, Column, Integer, String, Date, Enum
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+DATABASE_URL = "sqlite:///./test_todo.db"
+engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+class Todo(Base):
+    __tablename__ = "todos"
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(100), nullable=False)
+    description = Column(String(500))
+    due_date = Column(Date, nullable=False)
+    status = Column(Enum('pending', 'completed'), default='pending')
+
+Base.metadata.create_all(bind=engine)
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+app = FastAPI()
+
+@app.post("/todos/", response_model=Todo, status_code=201)
+def create_todo(todo: TodoCreate, db: Session = Depends(get_db)):
+    db_todo = Todo(**todo.model_dump())
+    db.add(db_todo)
+    db.commit()
+    db.refresh(db_todo)
+    return db_todo
+
+@app.get("/todos/", response_model=list[Todo])
+def list_todos(status: str | None = None, db: Session = Depends(get_db)):
+    if status:
+        query = db.query(Todo).filter_by(status=status)
+    else:
+        query = db.query(Todo)
+    return query.all()
+
+@app.get("/todos/{todo_id}", response_model=Todo)
+def get_todo(todo_id: int, db: Session = Depends(get_db)):
+    todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    return todo
+
+@app.put("/todos/{todo_id}", response_model=Todo)
+def update_todo(todo_id: int, todo: TodoCreate, db: Session = Depends(get_db)):
+    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not db_todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    for key, value in todo.model_dump().items():
+        setattr(db_todo, key, value)
+    db.commit()
+    db.refresh(db_todo)
+    return db_todo
+
+@app.delete("/todos/{todo_id}", status_code=204)
+def delete_todo(todo_id: int, db: Session = Depends(get_db)):
+    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
+    if not db_todo:
+        raise HTTPException(status_code=404, detail="Not found")
+    db.delete(db_todo)
+    db.commit()
+
+client = TestClient(app)
+
+def test_create_todo():
+    response = client.post("/todos/", json={"title": "Test Todo", "description": "This is a test todo.", "due_date": "2023-12-31"})
+    assert response.status_code == 201
+    data = response.json()
+    assert "id" in data
+    assert data["title"] == "Test Todo"
+    assert data["description"] == "This is a test todo."
+    assert data["due_date"] == "2023-12-31"
+    assert data["status"] == "pending"
+
+def test_list_todos():
+    response = client.get("/todos/")
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data) > 0
+
+def test_get_todo_by_id():
+    todo_id = create_test_todo().json()["id"]
+    response = client.get(f"/todos/{todo_id}")
+    assert response.status_code == 200
+    data = response.json()
+    assert "id" in data
+    assert data["title"] == "Test Todo"
+
+def test_get_nonexistent_todo():
+    response = client.get("/todos/999")
+    assert response.status_code == 404
+
+def test_update_todo():
+    todo_id = create_test_todo().json()["id"]
+    response = client.put(f"/todos/{todo_id}", json={"title": "Updated Todo"})
+    assert response.status_code == 200
+    data = response.json()
+    assert "id" in data
+    assert data["title"] == "Updated Todo"
+
+def test_delete_todo():
+    todo_id = create_test_todo().json()["id"]
+    response = client.delete(f"/todos/{todo_id}")
+    assert response.status_code == 204
+
+def create_test_todo():
+    return client.post("/todos/", json={"title": "Test Todo", "description": "This is a test todo.", "due_date": "2023
+```