(v7.x backport) test: add arrow functions to test-util-inspect
Backport of https://github.com/nodejs/node/pull/11781 to v7.x
/cc @italoacasas @cjihrig
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test