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We did some initial work in this branch https://github.com/PulseBlockchain/oz-sample-app/tree/vamsee/truffl4-oz2-web31.0 if you want to start with it. Without that work you will get compilation errors both from Solidity and Mocha/JS code. With the work in that branch the compile errors go away but the tests fail. It is possible the compile error fix need to be improved.