/* List all tests */
func listTests(svc *devicefarm.DeviceFarm, runArn string) {
listReq := &devicefarm.ListTestsInput{
Arn: aws.String(runArn),
}
resp, err := svc.ListTests(listReq)
failOnErr(err, "error listing tests")
fmt.Println(awsutil.Prettify(resp))
}