test: remove `require('buffer')` on 6 test files
- test/parallel/test-fs-mkdtemp.js
- test/parallel/test-fs-read-zero-length.js
- test/parallel/test-fs-read.js
- test/parallel/test-fs-whatwg-url.js
- test/parallel/test-fs-write-string-coerce.js
- test/parallel/test-fs-write.js
Refs: https://github.com/nodejs/node/issues/13836
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test, buffer