• Read the guideline before start

The database failed. Some users lost values from the first_name field, but user dict has a full_name field, so we can restore first_name.

Write tests for restore_names function, that takes a list of users and set correct first_name to users who do not have it or is equal to None. You should not return anything from the function.

Example:

users = [
  {
    "first_name": None,
    "last_name": "Holy",
    "full_name": "Jack Holy",
  },
  {
    "last_name": "Adams",
    "full_name": "Mike Adams",
  },
]

restore_names(users)

users == [
  {
    "first_name": "Jack",
    "last_name": "Holy",
    "full_name": "Jack Holy",
  },
  {
    "first_name": "Mike",
    "last_name": "Adams",
    "full_name": "Mike Adams",
  },
]

Run pytest app/ to check if function pass your tests.

Run pytest --numprocesses=auto tests/ to check if your tests cover all boundary conditions and pass task tests.