Domain-Specific Visual Languages (DSVLs) have captured the attention of the programming language world with their simplicity and high-level abstraction. This has encouraged many to use DSVLs as a way to write programs. With little or no programming knowledge, many end-users can program tasks that would be beyond them with conventional programming. Despite their benefits however, DSVLs need validation, just as conventional programs do. Tests are typically done manually and few DSVLs support testing processes inside the language or tool. Motivated by this, we propose a high-level visual test specification model that resides inside DSVL programs. This specification model enables users to design tests within their domains, providing a way to validate their development models.