better-unit-test-in-c#-article-Box-v1.cs

better-unit-test-in-c#-article-Box-v1.cs

public sealed record Box
{
  private readonly Dictionary<string, Thing> thingsInside;
  
  public int Size { get; init; }
  
  public bool IsOpen { get; private set; }
        
  public Box()
  {
      thingsInside = new();
  }

  public void Open()
  {
      IsOpen = true;
  }

  public void Close()
  {
      IsOpen = false;
  }

  public int GetAvailableSpace()
  {
      return Size - thingsInside.Values.Sum(thing => thing.Size);
  }

  public bool CanPutInside(Thing thing, string label)
  {
      return IsOpen && GetAvailableSpace() - thing.Size >= 0 && !thingsInside.ContainsKey(label);
  }

  public bool PutInside(
      Thing thing, 
      string label)
  {
      if (!CanPutInside(thing, label))
      {
          return false;
      }

      thingsInside.Add(label, thing);

      return true;
  }
}

public sealed record Thing
{
  public int Size { get; init; }
}