RF_Type::Bool AppendFormat()
 {
     StringBuilder builder;
     builder.AppendFormat("Hello %s!", "World");
     return builder.Length() == 12 && builder.Size() == 13 &&
         builder.Capacity() >= 13 && builder.AsCString() != 0;
 }
 RF_Type::Bool Destructor()
 {
     StringBuilder builder;
     builder.~StringBuilder();
     return builder.AsCString() == 0 && builder.Length() == 0 && 
         builder.Size() == 0 && builder.Capacity() == 0;
 }
 RF_Type::Bool AppendLine()
 {
     StringBuilder builder;
     builder.AppendLine();
     return builder.Length() == 0 && builder.Size() == 1 &&
         builder.Capacity() >= 1 && builder.AsCString() != 0 &&
         builder.AsCString()[0] == '\0';
 }
 RF_Type::Bool Replace()
 {
     StringBuilder builder;
     builder.Append("Hello W!");
     builder.Replace("W", "World");
     return builder.Length() == 12 && builder.Size() == 13 &&
         builder.Capacity() >= 13 && builder.AsCString()[7] == 'o';
 }
 RF_Type::Bool Remove()
 {
     StringBuilder builder;
     builder.Append("Hello World!");
     builder.Remove(6, 5);
     return builder.Length() == 7 && builder.Size() == 8 &&
         builder.Capacity() >= 8 && builder.AsCString()[6] == '!';
 }
 RF_Type::Bool Clear()
 {
     StringBuilder builder;
     builder.Append("test");
     RF_Type::Size capacity = builder.Capacity();
     builder.Clear();
     return builder.Capacity() == capacity && builder.Size() == 0 &&
         builder.Length() == 0;
 }
 RF_Type::Bool Append()
 {
     StringBuilder builder;
     builder.Append("Hi");
     return builder.Length() == 2 && builder.Size() == 3 &&
         builder.Capacity() >= 3 && builder.AsCString() != 0 &&
         builder.AsCString()[0] == 'H' && builder.AsCString()[1] == 'i' &&
         builder.AsCString()[2] == '\0';
 }
 RF_Type::Bool Insert()
 {
     StringBuilder builder;
     builder.Insert("Hello !",0);
     builder.Insert("World", 6);
     return builder.Length() == 12 && builder.Size() == 13 &&
         builder.Capacity() >= 13 && builder.AsCString()[6] == 'W' &&
         builder.AsCString()[11] == '!';
 }
 RF_Type::Bool Size()
 {
     StringBuilder builder;
     builder.Append("Hi");
     return builder.Size() == 3;
 }