public async Task ModifyRankAsync_ItemFound_SuccessfullyUpdatesRank()
{
// Arrange
var user = new IdentityUser("user_1")
{
Id = Guid.NewGuid().ToString(),
};
_context.Users.Add(user);
var item = new TodoItem(42, user.Id, "Fresh item", Importance.High)
{
Rank = 1,
};
_context.TodoItems.Add(item);
int newRank = item.Rank + 5;
await _context.SaveChangesAsync();
// Act
await _todoItemRepository.ModifyRankAsync(item.TodoItemId, newRank);
// Assert
TodoItem afterUpdate = await _context.TodoItems.SingleAsync(i => i.TodoItemId == item.TodoItemId);
Assert.Equal(newRank, afterUpdate.Rank);
}