diff --git a/.gitignore b/.gitignore
index 18f79fe..c8d408e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ venv/
 .pytest_cache/
 .ruff_cache/
 *.egg-info/
+.coverage
+htmlcov/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..00e0b30
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,7 @@
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.6.9
+    hooks:
+      - id: ruff
+        args: [--fix]
+      - id: ruff-format
diff --git a/README.md b/README.md
index d1f9e8d..8e60cac 100644
--- a/README.md
+++ b/README.md
@@ -19,10 +19,13 @@ API REST para gestión de gastos personales. Proyecto de portfolio con foco en *
 python -m venv .venv
 source .venv/bin/activate
 pip install -r requirements-dev.txt
+pre-commit install
 alembic upgrade head
 uvicorn app.main:app --reload
 ```
 
+`pre-commit install` deja `ruff check --fix` y `ruff format` corriendo antes de cada commit, así un fallo de lint se detecta en tu máquina y no en el CI.
+
 Docs interactivas en `http://localhost:8000/docs`.
 
 ## Migraciones (Alembic)
diff --git a/alembic/env.py b/alembic/env.py
index 248d2c3..c7f4033 100644
--- a/alembic/env.py
+++ b/alembic/env.py
@@ -65,9 +65,7 @@ def run_migrations_online() -> None:
     )
 
     with connectable.connect() as connection:
-        context.configure(
-            connection=connection, target_metadata=target_metadata
-        )
+        context.configure(connection=connection, target_metadata=target_metadata)
 
         with context.begin_transaction():
             context.run_migrations()
diff --git a/alembic/versions/896f574a4c93_create_initial_schema.py b/alembic/versions/896f574a4c93_create_initial_schema.py
index 4079eb4..fa3f0c8 100644
--- a/alembic/versions/896f574a4c93_create_initial_schema.py
+++ b/alembic/versions/896f574a4c93_create_initial_schema.py
@@ -1,10 +1,11 @@
 """create initial schema
 
 Revision ID: 896f574a4c93
-Revises: 
+Revises:
 Create Date: 2026-08-12 09:28:21.452383
 
 """
+
 from typing import Sequence, Union
 
 from alembic import op
@@ -12,7 +13,7 @@
 
 
 # revision identifiers, used by Alembic.
-revision: str = '896f574a4c93'
+revision: str = "896f574a4c93"
 down_revision: Union[str, None] = None
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
@@ -20,40 +21,52 @@
 
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.create_table('users',
-    sa.Column('id', sa.Integer(), nullable=False),
-    sa.Column('email', sa.String(length=255), nullable=False),
-    sa.Column('hashed_password', sa.String(length=255), nullable=False),
-    sa.Column('created_at', sa.DateTime(), nullable=False),
-    sa.PrimaryKeyConstraint('id')
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("email", sa.String(length=255), nullable=False),
+        sa.Column("hashed_password", sa.String(length=255), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
     )
-    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
-    op.create_table('categories',
-    sa.Column('id', sa.Integer(), nullable=False),
-    sa.Column('name', sa.String(length=100), nullable=False),
-    sa.Column('user_id', sa.Integer(), nullable=False),
-    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
-    sa.PrimaryKeyConstraint('id')
+    op.create_index(op.f("ix_users_email"), "users", ["email"], unique=True)
+    op.create_table(
+        "categories",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.String(length=100), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
     )
-    op.create_table('expenses',
-    sa.Column('id', sa.Integer(), nullable=False),
-    sa.Column('amount', sa.Numeric(precision=10, scale=2), nullable=False),
-    sa.Column('description', sa.String(length=255), nullable=False),
-    sa.Column('date', sa.Date(), nullable=False),
-    sa.Column('created_at', sa.DateTime(), nullable=False),
-    sa.Column('user_id', sa.Integer(), nullable=False),
-    sa.Column('category_id', sa.Integer(), nullable=False),
-    sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
-    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
-    sa.PrimaryKeyConstraint('id')
+    op.create_table(
+        "expenses",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("amount", sa.Numeric(precision=10, scale=2), nullable=False),
+        sa.Column("description", sa.String(length=255), nullable=False),
+        sa.Column("date", sa.Date(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("category_id", sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ["category_id"],
+            ["categories.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
     )
     # ### end Alembic commands ###
 
 
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('expenses')
-    op.drop_table('categories')
-    op.drop_index(op.f('ix_users_email'), table_name='users')
-    op.drop_table('users')
+    op.drop_table("expenses")
+    op.drop_table("categories")
+    op.drop_index(op.f("ix_users_email"), table_name="users")
+    op.drop_table("users")
     # ### end Alembic commands ###
diff --git a/app/api/routes/auth.py b/app/api/routes/auth.py
index c4ad3e4..8f5d531 100644
--- a/app/api/routes/auth.py
+++ b/app/api/routes/auth.py
@@ -16,7 +16,9 @@
 def register(user_in: UserCreate, db: Session = Depends(get_db)) -> User:
     existing = db.query(User).filter(User.email == user_in.email).first()
     if existing:
-        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Email already registered")
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Email already registered"
+        )
 
     user = User(email=user_in.email, hashed_password=hash_password(user_in.password))
     db.add(user)
@@ -28,7 +30,9 @@ def register(user_in: UserCreate, db: Session = Depends(get_db)) -> User:
 @router.post("/login", response_model=Token)
 @limiter.limit("5/minute")
 def login(
-    request: Request, form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)
+    request: Request,
+    form_data: OAuth2PasswordRequestForm = Depends(),
+    db: Session = Depends(get_db),
 ) -> Token:
     user = db.query(User).filter(User.email == form_data.username).first()
     if not user or not verify_password(form_data.password, user.hashed_password):
diff --git a/app/core/security.py b/app/core/security.py
index e907daf..b4834d7 100644
--- a/app/core/security.py
+++ b/app/core/security.py
@@ -18,14 +18,18 @@ def verify_password(plain_password: str, hashed_password: str) -> bool:
 
 
 def create_access_token(subject: str) -> str:
-    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
+    expire = datetime.now(timezone.utc) + timedelta(
+        minutes=settings.access_token_expire_minutes
+    )
     payload = {"sub": subject, "exp": expire}
     return jwt.encode(payload, settings.secret_key, algorithm=settings.algorithm)
 
 
 def decode_access_token(token: str) -> Optional[str]:
     try:
-        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
+        payload = jwt.decode(
+            token, settings.secret_key, algorithms=[settings.algorithm]
+        )
         return payload.get("sub")
     except JWTError:
         return None
diff --git a/app/db/session.py b/app/db/session.py
index d0c47b5..2fabc69 100644
--- a/app/db/session.py
+++ b/app/db/session.py
@@ -5,7 +5,9 @@
 
 from app.core.config import settings
 
-connect_args = {"check_same_thread": False} if settings.database_url.startswith("sqlite") else {}
+connect_args = (
+    {"check_same_thread": False} if settings.database_url.startswith("sqlite") else {}
+)
 
 engine = create_engine(settings.database_url, connect_args=connect_args)
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
diff --git a/app/main.py b/app/main.py
index 3399cb8..5bf6adf 100644
--- a/app/main.py
+++ b/app/main.py
@@ -53,9 +53,13 @@ def http_exception_handler(request, exc: StarletteHTTPException) -> JSONResponse
 
 @app.exception_handler(RequestValidationError)
 def validation_exception_handler(request, exc: RequestValidationError) -> JSONResponse:
-    return JSONResponse(status_code=422, content={"error": "Validation failed", "details": exc.errors()})
+    return JSONResponse(
+        status_code=422, content={"error": "Validation failed", "details": exc.errors()}
+    )
 
 
 @app.exception_handler(RateLimitExceeded)
 def rate_limit_exceeded_handler(request, exc: RateLimitExceeded) -> JSONResponse:
-    return JSONResponse(status_code=429, content={"error": f"Rate limit exceeded: {exc.detail}"})
+    return JSONResponse(
+        status_code=429, content={"error": f"Rate limit exceeded: {exc.detail}"}
+    )
diff --git a/app/models/expense.py b/app/models/expense.py
index 6f1ad46..b2b2024 100644
--- a/app/models/expense.py
+++ b/app/models/expense.py
@@ -19,10 +19,14 @@ class Expense(Base):
     amount: Mapped[float] = mapped_column(Numeric(10, 2), nullable=False)
     description: Mapped[str] = mapped_column(String(255), nullable=False)
     date: Mapped[date_] = mapped_column(Date, nullable=False)
-    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, default=lambda: datetime.now(timezone.utc)
+    )
 
     user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
-    category_id: Mapped[int] = mapped_column(ForeignKey("categories.id"), nullable=False)
+    category_id: Mapped[int] = mapped_column(
+        ForeignKey("categories.id"), nullable=False
+    )
 
     owner: Mapped["User"] = relationship(back_populates="expenses")
     category: Mapped["Category"] = relationship(back_populates="expenses")
diff --git a/app/models/user.py b/app/models/user.py
index c7f86cd..133eeda 100644
--- a/app/models/user.py
+++ b/app/models/user.py
@@ -15,9 +15,17 @@ class User(Base):
     __tablename__ = "users"
 
     id: Mapped[int] = mapped_column(primary_key=True)
-    email: Mapped[str] = mapped_column(String(255), unique=True, index=True, nullable=False)
+    email: Mapped[str] = mapped_column(
+        String(255), unique=True, index=True, nullable=False
+    )
     hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
-    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, default=lambda: datetime.now(timezone.utc)
+    )
 
-    categories: Mapped[list["Category"]] = relationship(back_populates="owner", cascade="all, delete-orphan")
-    expenses: Mapped[list["Expense"]] = relationship(back_populates="owner", cascade="all, delete-orphan")
+    categories: Mapped[list["Category"]] = relationship(
+        back_populates="owner", cascade="all, delete-orphan"
+    )
+    expenses: Mapped[list["Expense"]] = relationship(
+        back_populates="owner", cascade="all, delete-orphan"
+    )
diff --git a/app/services/category_service.py b/app/services/category_service.py
index eda5557..5c20ce0 100644
--- a/app/services/category_service.py
+++ b/app/services/category_service.py
@@ -5,7 +5,9 @@
 from app.schemas.category import CategoryCreate, CategoryUpdate
 
 
-def list_categories(db: Session, user_id: int, skip: int = 0, limit: int = 50) -> list[Category]:
+def list_categories(
+    db: Session, user_id: int, skip: int = 0, limit: int = 50
+) -> list[Category]:
     return (
         db.query(Category)
         .filter(Category.user_id == user_id)
@@ -26,14 +28,20 @@ def create_category(db: Session, user_id: int, data: CategoryCreate) -> Category
 
 def get_category_or_404(db: Session, user_id: int, category_id: int) -> Category:
     category = (
-        db.query(Category).filter(Category.id == category_id, Category.user_id == user_id).first()
+        db.query(Category)
+        .filter(Category.id == category_id, Category.user_id == user_id)
+        .first()
     )
     if category is None:
-        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Category not found")
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Category not found"
+        )
     return category
 
 
-def update_category(db: Session, user_id: int, category_id: int, data: CategoryUpdate) -> Category:
+def update_category(
+    db: Session, user_id: int, category_id: int, data: CategoryUpdate
+) -> Category:
     category = get_category_or_404(db, user_id, category_id)
     if data.name is not None:
         category.name = data.name
diff --git a/app/services/expense_service.py b/app/services/expense_service.py
index fa54954..cea06d8 100644
--- a/app/services/expense_service.py
+++ b/app/services/expense_service.py
@@ -6,7 +6,9 @@
 from app.services.category_service import get_category_or_404
 
 
-def list_expenses(db: Session, user_id: int, skip: int = 0, limit: int = 50) -> list[Expense]:
+def list_expenses(
+    db: Session, user_id: int, skip: int = 0, limit: int = 50
+) -> list[Expense]:
     return (
         db.query(Expense)
         .filter(Expense.user_id == user_id)
@@ -33,13 +35,21 @@ def create_expense(db: Session, user_id: int, data: ExpenseCreate) -> Expense:
 
 
 def get_expense_or_404(db: Session, user_id: int, expense_id: int) -> Expense:
-    expense = db.query(Expense).filter(Expense.id == expense_id, Expense.user_id == user_id).first()
+    expense = (
+        db.query(Expense)
+        .filter(Expense.id == expense_id, Expense.user_id == user_id)
+        .first()
+    )
     if expense is None:
-        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Expense not found")
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Expense not found"
+        )
     return expense
 
 
-def update_expense(db: Session, user_id: int, expense_id: int, data: ExpenseUpdate) -> Expense:
+def update_expense(
+    db: Session, user_id: int, expense_id: int, data: ExpenseUpdate
+) -> Expense:
     expense = get_expense_or_404(db, user_id, expense_id)
     if data.category_id is not None:
         get_category_or_404(db, user_id, data.category_id)
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 47f95ec..e276d9e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,3 +3,4 @@ pytest==8.3.3
 pytest-cov==5.0.0
 httpx==0.27.2
 ruff==0.6.9
+pre-commit==4.3.0
diff --git a/tests/conftest.py b/tests/conftest.py
index 7a2c398..65e84a5 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -47,7 +47,9 @@ def override_get_db():
 
 @pytest.fixture()
 def auth_headers(client):
-    client.post("/auth/register", json={"email": "test@example.com", "password": "secret123"})
+    client.post(
+        "/auth/register", json={"email": "test@example.com", "password": "secret123"}
+    )
     response = client.post(
         "/auth/login",
         data={"username": "test@example.com", "password": "secret123"},
diff --git a/tests/integration/test_auth.py b/tests/integration/test_auth.py
index 3eb8792..792b74a 100644
--- a/tests/integration/test_auth.py
+++ b/tests/integration/test_auth.py
@@ -1,5 +1,7 @@
 def test_register_and_login(client):
-    response = client.post("/auth/register", json={"email": "a@example.com", "password": "secret123"})
+    response = client.post(
+        "/auth/register", json={"email": "a@example.com", "password": "secret123"}
+    )
     assert response.status_code == 201
     assert response.json()["email"] == "a@example.com"
 
@@ -11,13 +13,19 @@ def test_register_and_login(client):
 
 
 def test_register_duplicate_email_fails(client):
-    client.post("/auth/register", json={"email": "dup@example.com", "password": "secret123"})
-    response = client.post("/auth/register", json={"email": "dup@example.com", "password": "secret123"})
+    client.post(
+        "/auth/register", json={"email": "dup@example.com", "password": "secret123"}
+    )
+    response = client.post(
+        "/auth/register", json={"email": "dup@example.com", "password": "secret123"}
+    )
     assert response.status_code == 400
 
 
 def test_login_wrong_password_fails(client):
-    client.post("/auth/register", json={"email": "b@example.com", "password": "secret123"})
+    client.post(
+        "/auth/register", json={"email": "b@example.com", "password": "secret123"}
+    )
     response = client.post(
         "/auth/login", data={"username": "b@example.com", "password": "wrong"}
     )
diff --git a/tests/integration/test_categories.py b/tests/integration/test_categories.py
index 94c7a19..0224f60 100644
--- a/tests/integration/test_categories.py
+++ b/tests/integration/test_categories.py
@@ -1,5 +1,7 @@
 def test_get_category_returns_owned_category(client, auth_headers):
-    create_response = client.post("/categories", json={"name": "Transporte"}, headers=auth_headers)
+    create_response = client.post(
+        "/categories", json={"name": "Transporte"}, headers=auth_headers
+    )
     category_id = create_response.json()["id"]
 
     response = client.get(f"/categories/{category_id}", headers=auth_headers)
@@ -14,14 +16,20 @@ def test_get_category_404_when_missing(client, auth_headers):
 
 
 def test_get_category_404_when_owned_by_another_user(client, auth_headers):
-    create_response = client.post("/categories", json={"name": "Ocio"}, headers=auth_headers)
+    create_response = client.post(
+        "/categories", json={"name": "Ocio"}, headers=auth_headers
+    )
     category_id = create_response.json()["id"]
 
-    client.post("/auth/register", json={"email": "other@example.com", "password": "secret123"})
+    client.post(
+        "/auth/register", json={"email": "other@example.com", "password": "secret123"}
+    )
     login_response = client.post(
         "/auth/login", data={"username": "other@example.com", "password": "secret123"}
     )
-    other_user_headers = {"Authorization": f"Bearer {login_response.json()['access_token']}"}
+    other_user_headers = {
+        "Authorization": f"Bearer {login_response.json()['access_token']}"
+    }
 
     response = client.get(f"/categories/{category_id}", headers=other_user_headers)
 
diff --git a/tests/integration/test_rate_limit.py b/tests/integration/test_rate_limit.py
index 4cce128..7b86c2d 100644
--- a/tests/integration/test_rate_limit.py
+++ b/tests/integration/test_rate_limit.py
@@ -1,5 +1,8 @@
 def test_login_is_rate_limited_after_five_attempts_per_minute(client):
-    client.post("/auth/register", json={"email": "ratelimit@example.com", "password": "secret123"})
+    client.post(
+        "/auth/register",
+        json={"email": "ratelimit@example.com", "password": "secret123"},
+    )
 
     for _ in range(5):
         response = client.post(
diff --git a/tests/unit/test_category_service.py b/tests/unit/test_category_service.py
index f280d73..2539552 100644
--- a/tests/unit/test_category_service.py
+++ b/tests/unit/test_category_service.py
@@ -18,7 +18,9 @@ def test_list_categories_filters_paginates_and_orders():
 
 def test_create_category_sets_owner_and_persists():
     db = MagicMock()
-    result = category_service.create_category(db, user_id=1, data=CategoryCreate(name="Ocio"))
+    result = category_service.create_category(
+        db, user_id=1, data=CategoryCreate(name="Ocio")
+    )
     assert result.name == "Ocio"
     assert result.user_id == 1
     db.add.assert_called_once_with(result)
@@ -52,7 +54,9 @@ def test_update_category_applies_only_provided_fields():
     fake_category.name = "Old"
     db.query.return_value.filter.return_value.first.return_value = fake_category
 
-    category_service.update_category(db, user_id=1, category_id=1, data=CategoryUpdate(name="New"))
+    category_service.update_category(
+        db, user_id=1, category_id=1, data=CategoryUpdate(name="New")
+    )
 
     assert fake_category.name == "New"
     db.commit.assert_called_once()
@@ -64,7 +68,9 @@ def test_update_category_keeps_name_when_not_provided():
     fake_category.name = "Old"
     db.query.return_value.filter.return_value.first.return_value = fake_category
 
-    category_service.update_category(db, user_id=1, category_id=1, data=CategoryUpdate())
+    category_service.update_category(
+        db, user_id=1, category_id=1, data=CategoryUpdate()
+    )
 
     assert fake_category.name == "Old"
 
diff --git a/tests/unit/test_expense_service.py b/tests/unit/test_expense_service.py
index 40104f1..f9171a9 100644
--- a/tests/unit/test_expense_service.py
+++ b/tests/unit/test_expense_service.py
@@ -20,7 +20,9 @@ def test_list_expenses_paginates_and_orders():
 @patch("app.services.expense_service.get_category_or_404")
 def test_create_expense_validates_category_belongs_to_user(mock_get_category):
     db = MagicMock()
-    data = ExpenseCreate(amount=12.5, description="Cafe", date=date(2026, 1, 1), category_id=5)
+    data = ExpenseCreate(
+        amount=12.5, description="Cafe", date=date(2026, 1, 1), category_id=5
+    )
 
     result = expense_service.create_expense(db, user_id=1, data=data)
 
@@ -32,9 +34,13 @@ def test_create_expense_validates_category_belongs_to_user(mock_get_category):
 
 @patch("app.services.expense_service.get_category_or_404")
 def test_create_expense_propagates_404_for_foreign_category(mock_get_category):
-    mock_get_category.side_effect = HTTPException(status_code=404, detail="Category not found")
+    mock_get_category.side_effect = HTTPException(
+        status_code=404, detail="Category not found"
+    )
     db = MagicMock()
-    data = ExpenseCreate(amount=12.5, description="Cafe", date=date(2026, 1, 1), category_id=999)
+    data = ExpenseCreate(
+        amount=12.5, description="Cafe", date=date(2026, 1, 1), category_id=999
+    )
 
     with pytest.raises(HTTPException) as exc_info:
         expense_service.create_expense(db, user_id=1, data=data)
@@ -59,7 +65,9 @@ def test_update_expense_revalidates_new_category_ownership(mock_get_category):
     fake_expense = MagicMock(category_id=1)
     db.query.return_value.filter.return_value.first.return_value = fake_expense
 
-    expense_service.update_expense(db, user_id=1, expense_id=1, data=ExpenseUpdate(category_id=2))
+    expense_service.update_expense(
+        db, user_id=1, expense_id=1, data=ExpenseUpdate(category_id=2)
+    )
 
     mock_get_category.assert_called_once_with(db, 1, 2)
     assert fake_expense.category_id == 2
@@ -70,7 +78,9 @@ def test_update_expense_only_touches_provided_fields():
     fake_expense = MagicMock(amount=10, description="Old", date=date(2026, 1, 1))
     db.query.return_value.filter.return_value.first.return_value = fake_expense
 
-    expense_service.update_expense(db, user_id=1, expense_id=1, data=ExpenseUpdate(description="New"))
+    expense_service.update_expense(
+        db, user_id=1, expense_id=1, data=ExpenseUpdate(description="New")
+    )
 
     assert fake_expense.description == "New"
     assert fake_expense.amount == 10