test: improve code coverage for string decoder#22306

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BeniCheni wants to merge 2 commits intonodejs:masterfrom

BeniCheni:string-decoder-test-coverage

Commits on Aug 14, 2018

test: improve code coverage for string decoder
BeniCheni
committed

Commits on Aug 24, 2018

Merge branch 'master' into string-decoder-test-coverage
BeniCheni
committed