Fix tests by only flushing gzip writer once #4
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Closing the gzip writer causes a flush, and doesn't actually close the underlying file, so we can switch to closing the gzip writer before closing the underlying file, instead of using Flush(). The previous approach of Flushing and then Closing caused us to flush twice, which had the side-effect of causing the underlying file to have an additional 5 bytes of data that was not expected in our tests.