google / google-api-ruby-client / 873

98%

Pull #638

travis-ci

Allow download destination to only respond to #write

According to the documentation the destination IO only needs to respond
to #write. However, the downloader breaks this by calling #flush.

We fix this by calling #flush only if the destination IO responds to
that method. We also add a test to enforce that the destination IO only
needs to respond to #write.

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