Used for integration database tests, when we want to avoid Id clashes with current DB entities. It sets long value, but every time we retrieve it we get negative value.

NegativeLong

/// <summary>
/// Class should be used only by AutoFixture. Used for integration database tests, when we want to avoid Id clashes with current DB entities.
/// It sets long value, but every time we retrieve it we get negative value.
/// <remarks>
/// Class should be used only by <see cref="Fixture"/>, either directly by Create() method or by <see cref="AutoDataAttribute"/>.
/// </remarks>
/// </summary>
/// <example>  
/// This sample shows how to use the <see cref="NegativeLongId"/> class
/// <code> 
/// long accountId = new Fixture().Create&lt;NegativeLong&gt;();
/// </code> 
/// </example> 
public class NegativeLong
{
    private readonly long _value;

    public NegativeLong(long value)
    {
        _value = Negate(value);
    }

    private static long Negate(long value)
    {
        return -value;
    }

    public static implicit operator long(NegativeLong negativeLong)
    {
        return negativeLong._value;
    }
    
    // TODO: Another approach can be class NegativeId with backing field of type long, and implicit operators to int, short, etc.
}