1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.media.audiotestharness.server.utility;
18 
19 import static org.junit.Assert.assertTrue;
20 
21 import org.junit.Test;
22 import org.junit.runner.RunWith;
23 import org.junit.runners.JUnit4;
24 
25 import java.net.ServerSocket;
26 
27 @RunWith(JUnit4.class)
28 public class PortUtilityTests {
29 
30     @Test
nextAvailablePort_returnsAvailablePortWithinRange_fuzz()31     public void nextAvailablePort_returnsAvailablePortWithinRange_fuzz() throws Exception {
32         // Fuzz test the utility ten times.
33         for (int i = 0; i < 10; i++) {
34             int port = PortUtility.nextAvailablePort();
35 
36             assertTrue(port >= PortUtility.START_PORT);
37             assertTrue(port < PortUtility.END_PORT);
38 
39             // If no exception is thrown, the port was indeed open and can be used.
40             new ServerSocket(port).close();
41         }
42     }
43 }
44