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Property-based testing (PBT) is a technique for validating code against an executable specification by automatically generating test-data. We present a proof-theoretical reconstruction of this style of testing for relational specifications and employ the Foundational Proof Certificate framework to describe test generators. We do this by encoding certain kinds of “proof outlines” as proof certificates that can describe various common generation strategies in the PBT literature, ranging from random to exhaustive, including their combination. We also address the shrinking of counterexamples as a first step toward their explanation. Once generation is accomplished, the testing phase is a standard logic programing search. After illustrating our techniques on simple, first-order (algebraic) data structures, we lift it to data structures containing bindings by using the 
$\lambda$-tree syntax approach to encode bindings. The 
$\lambda$Prolog programing language can perform both generating and checking of tests using this approach to syntax. We then further extend PBT to specifications in a fragment of linear logic.
