lib not working with jest / jest regression

[majirosstefan]

Using React Native v.64.1, and Jest ^26.6.3", it throws an error during running tests,
probably because of Jest regression - more here:
jestjs/jest#7780

This the stack of error:

TypeError: Not a string or buffer
        at zlibBufferSync (/Users/stefanmajiros/green-pass-reader/GreenPassIssuer/node_modules/react-zlib-js/index.js:1935:39)
        at Object.inflateSync (/Users/stefanmajiros/green-pass-reader/GreenPassIssuer/node_modules/react-zlib-js/index.js:1864:10)
        at decompressZlib (/Users/stefanmajiros/green-pass-reader/GreenPassIssuer/src/qrParser/zlibDecompressor.js:8:29)

If I comment this line
if (!Buffer.isBuffer(buffer)) throw new TypeError('Not a string or buffer');
test pass.

[kpanuragh]

Buffer in react-zlib-js not node native Buffer class its pure JS implementation of Buffer so You can't test buffer class with Node version of Buffer