test: remove `require('buffer')` on 4 test files
We don't use the global Buffer throughout the lib/ to avoid circular dependency issues in core, but we actually don't need to require it on test files. So remove them on:
- test/parallel/test-stream-uint8array.js
- test/parallel/test-stream2-finish-pipe.js
- test/parallel/test-tls-session-cache.js
- test/parallel/test-vm-cached-data.js
Refs: https://github.com/nodejs/node/issues/13836
Checklist
-
make -j4 test
(UNIX) -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test, buffer