c.Check(err, check.NotNil)
c.Check(stats(), check.Matches, `.*"Ops":[^0],.*`)
c.Check(stats(), check.Matches, `.*"s3.requestFailure 404 NoSuchKey[^"]*":[^0].*`)
c.Check(err, check.NotNil)
c.Check(stats(), check.Matches, `.*"Ops":[^0],.*`)
c.Check(stats(), check.Matches, `.*"s3.requestFailure 404 NoSuchKey[^"]*":[^0].*`)