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* See LICENSE.md for licensing information.

package org.usb4java;

import static org.junit.Assert.assertEquals;

import static org.usb4java.test.UsbAssume.assumeHotplugAvailable;

import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;

import java.util.ArrayList;

import java.util.List;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

/**

* Tests the hotplug part of the {@link LibUsb} class.

* @author Klaus Reimer (k@ailis.de)

public class LibUsbHotplugTest

{

/** The libusb context. */

private Context context;

/**

* Set up the test.

@Before

public void setUp()

{

if (isUsbTestsEnabled())

{

this.context = new Context();

LibUsb.init(this.context);

}

/**

* Tear down the test.

@After

public void tearDown()

{

if (isUsbTestsEnabled())

{

if (this.context != null)

{

LibUsb.exit(this.context);

}

/**

* Tests the enumeration of connected devices through the hotplug API. This

* test simply compares the number of enumerated devices with the device

* list. When no devices are connected then this test is pretty much useless

* but won't fail because of that.

@Test

public void testHotplugEnumeration()

{

assumeHotplugAvailable();

final List<Integer> events = new ArrayList<Integer>();

HotplugCallbackHandle callbackHandle = new HotplugCallbackHandle();

int result = LibUsb.hotplugRegisterCallback(this.context,

LibUsb.HOTPLUG_EVENT_DEVICE_ARRIVED,

LibUsb.HOTPLUG_ENUMERATE,

LibUsb.HOTPLUG_MATCH_ANY,

new HotplugCallback()

{

@Override

public int processEvent(Context context, Device device,

int event,

Object userData)

{

events.add(event);

return 0;

}

}, null, callbackHandle);

assertEquals(result, LibUsb.SUCCESS);

LibUsb.hotplugDeregisterCallback(this.context, callbackHandle);

DeviceList devices = new DeviceList();

LibUsb.getDeviceList(this.context, devices);

int numDevices = devices.getSize();

LibUsb.freeDeviceList(devices, true);

assertEquals(numDevices, events.size());

}

/**

* Ensures that no hotplug event is fired when enumeration is deactivated.

* When no devices are connected then this test is pretty much useless but

* won't fail because of that.

@Test

public void testHotplugEnumerationOff()

{