test: add tests for rs+, sr+ to test-fs-open-flags.js#10780

hiroppy wants to merge 1 commit intonodejs:masternodejs/node:masterfrom

hiroppy:feature/add-tests-to-test-fs-open-flags.jshiroppy/node:feature/add-tests-to-test-fs-open-flags.jsCopy head branch name to clipboard