/// <summary>
/// Test whether the constraint is satisfied by a given value
/// </summary>
/// <param name="actual">The value to be tested</param>
/// <returns>True for success, false for failure</returns>
public override ConstraintResult ApplyTo <TActual>(TActual actual)
{
// NOTE: actual is string will fail for a null typed as string
Type actualType = typeof(TActual);
if (actualType == typeof(string))
{
realConstraint = new EmptyStringConstraint();
}
else if (actual is Guid || actualType == typeof(Guid?))
{
realConstraint = new EmptyGuidConstraint();
}
else if (actual == null)
{
throw new System.ArgumentException($"The actual value must be a string, Guid, non-null IEnumerable or DirectoryInfo. The value passed was of type {actualType}.", nameof(actual));
}
else if (actual is System.IO.DirectoryInfo)
{
realConstraint = new EmptyDirectoryConstraint();
}
else
{
realConstraint = new EmptyCollectionConstraint();
}
return(realConstraint.ApplyTo(actual));
}
/// <summary>
/// Test whether the constraint is satisfied by a given value
/// </summary>
/// <param name="actual">The value to be tested</param>
/// <returns>True for success, false for failure</returns>
public override ConstraintResult ApplyTo <TActual>(TActual actual)
{
// NOTE: actual is string will fail for a null typed as string
Type actualType = actual?.GetType() ?? typeof(TActual);
if (actualType == typeof(string))
{
realConstraint = new EmptyStringConstraint();
}
else if (actual is Guid || actualType == typeof(Guid?))
{
realConstraint = new EmptyGuidConstraint();
}
else if (actual is System.IO.DirectoryInfo)
{
realConstraint = new EmptyDirectoryConstraint();
}
else if (actual is System.Collections.ICollection)
{
realConstraint = new EmptyCollectionConstraint(); // Uses ICollecion.Count
}
else if (actual is System.Collections.IEnumerable) // Enumerates whole collection
{
realConstraint = new EmptyCollectionConstraint();
}
else if (CountZeroConstraint.HasCountProperty(actualType)) // For Collections that have Count but are not ICollection
{
realConstraint = new CountZeroConstraint();
}
else
{
throw new ArgumentException($"The actual value must be not-null, a string, Guid, have an int Count property, IEnumerable or DirectoryInfo. The value passed was of type {actualType}.", nameof(actual));
}
return(realConstraint.ApplyTo(actual));
}
