private int findRandomPort(int minPort, int maxPort) {
            int portRange = maxPort - minPort;
            return minPort + random.nextInt(portRange);
        }
Find a pseudo-random port number within the range
[{@code minPort}, {@code maxPort}].
@param minPort the minimum port number
@param maxPort the maximum port number
@return a random port number within the specified range
agent-module/plugins-test-module/testcase/src/main/java/com/navercorp/pinpoint/testcase/util/SocketUtils.java