ENTENTE (live source code here: https://github.com/damorimRG/entente) ENTENTE is framework that combines two well-known testing techniques (test transplantation and differential testing) to find bugs in JavaScript engines. We evaluated ENTENTE into five well-known JavaScript engines: chakra from Microsoft, JavaScriptCore from Apple, V8 from Google, SpiderMonkey from Mozilla, and hermes from Facebook. Overall, we found 59 bugs using ENTENTE. Among them, 35 bugs were discovered with test transplantation (23 of these bugs confirmed and 12 fixed) and 24 bugs with differential testing (16 of these confirmed and 10 fixed). How to use ENTENTE ENTENTE is a framework written in Python (version 3.6). A brief description of the most important ENTENTE directories are next: jsfuzz: contains the ENTENTE scripts fuzz_drivers: performs ENTENTE test executions seeds: contains JavsScript test files used to feed ENTENTE bin_fuzzers: contains the fuzzers binaries If your setup is already configured (keep reading if not), you just need to run tox in the current folder: $> tox