conflict; user already exists

app/routers/user.py

@@ -12,9 +12,15 @@
 @router.post("/", status_code=status.HTTP_201_CREATED, response_model=schemas.UserOut) # Default status code changed, first validate the pydantic model and only show that to the user (prevent sharing unneccesary data)
 def create_user(user: schemas.UserCreate, db: Session = Depends(get_db)):
 
+
+    if not db.query(models.User).filter(models.User.email == user.email).first() is None:
+        raise HTTPException(status_code=status.HTTP_409_CONFLICT,
+                            detail=f"Username already exists.")
+
     hashed_password = utils.hash(user.password)
     user.password = hashed_password 
     new_user = models.User(**user.model_dump())
+
     db.add(new_user)
     db.commit()
     db.refresh(new_user)

tests/test_users.py

@@ -45,4 +45,10 @@ def test_incorrect_login(client, test_user, email, password, status_code):
     res = client.post("/login",
                       data={"username": email, "password": password})
 
-    assert res.status_code == status_code
+    assert res.status_code == status_code
+
+def test_user_conflict_user_already_exists(client, test_user):
+    res = client.post("/users/",
+                      json={"email": test_user["email"], "password": "somePassword"})
+
+    assert res.status_code == 409