Abstract: Embodiments of the present invention provide a system that generates a test for a class under test. The system first receives an operation sequence to be applied to the class under test. The system then generates one or more operation subsequences from the received operation sequence. Next, the system filters each operation subsequence. The system then produces a filtered version of the operation subsequences, wherein the filtered version of the operating subsequences can be used to perform tests on the class under test more expediently.