// generate a random bucket name.
	bucketName := getRandomBucketName()
	// generating a HTTP request to create bucket.
	// using invalid bucket name.
	request, err := newTestSignedRequest(http.MethodPut, s.endPoint+"/putbucket-.",
		0, nil, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)

	response, err := s.client.Do(request)
	c.Assert(err, nil)
	// expected to fail with error message "InvalidBucketName".