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Property-based testing is a powerful method to validate program correctness.It is, however, not widely use in industry as the barrier of entry can be veryhigh. One of the hindrances is to write the generators that are needed togenerate randomised input data. Program properties often take complicated datastructures as inputs and, it requires a significant amount of effort to writegenerators for such structures in a invariant preserving way.  In this paper, we suggest and formalise a new programming language\textsf{pun}; a simple functional programming with properties as a built-inmechanism for program validation. We show how to generate input for\textsf{pun} properties automatically, thus, providing the programmer with alow barrier of entry for using property-based testing. We evaluate our work aon library for binary search trees and compare the test results to a similarlibrary in Haskell.

pun: Fun with Properties; Towards a Programming Language With Built-in Facilities for Program Validation