Methods and systems for testing a software program are provided. The methods include receiving a textual input for testing at least one static type used by the software program. The textual input of an embodiment is pre-linked to the at least one static type. The method includes creating a dynamic type based on the textual input in a dynamically typed language. The dynamic type is populated based on a predefined set of test vectors and is then passed on to the software program. The software program is executed using the dynamic type. Executing the software program by using the dynamic type invokes the at least one static type used by the software program.