test: increase fs.exists coverage
Tests the case of calling fs.exists without a callback.
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test
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Tests the case of calling fs.exists without a callback.
make -j4 test (UNIX), or vcbuild test (Windows) passestest