public void Add_Remove_Function()
{
ExpressionProcessor.AddFunction(typeof(string), nameof(string.Trim));
Assert.True(ExpressionProcessor.ContainsFunction(typeof(string), nameof(string.Trim)));
ExpressionProcessor.RemoveFunction(typeof(string), nameof(string.Trim));
Assert.False(ExpressionProcessor.ContainsFunction(typeof(string), nameof(string.Trim)));
}