Add unit test for DeviceList class

src/test/java/org/usb4java/DeviceListTest.java

@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2014 Klaus Reimer <k@ailis.de>
+ * See LICENSE.md for licensing information.
+ */
+
+package org.usb4java;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Tests the {@link DeviceList} class.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+public class DeviceListTest
+{
+    /**
+     * Setup test.
+     */
+    @Before
+    public void setUp()
+    {
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+        }
+    }
+
+    /**
+     * Tear down test.
+     */
+    @After
+    public void tearDown()
+    {
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
+    }
+
+    /**
+     * Tests the {@link DeviceList#equals(Object)} method. This equals test
+     * is not complete because we can't generate two different device lists
+     * without user interaction.
+     */
+    @Test
+    public void testEquals()
+    {
+        assumeUsbTestsEnabled();
+        DeviceList a = new DeviceList();
+        DeviceList b = new DeviceList();
+        LibUsb.getDeviceList(null, a);
+        LibUsb.getDeviceList(null, b);
+        try
+        {
+            assertTrue(a.equals(a));
+            assertTrue(b.equals(b));
+            assertFalse(a.equals(b));
+            assertFalse(a.equals(null));
+            assertFalse(a.equals(""));
+        }
+        finally
+        {
+            LibUsb.freeDeviceList(a, true);
+            LibUsb.freeDeviceList(b, true);
+        }
+    }
+    
+    /**
+     * Tests the {@link DeviceList#hashCode()} method.
+     */
+    @Test
+    public void testHashCode()
+    {
+        assumeUsbTestsEnabled();
+        DeviceList list = new DeviceList();
+        LibUsb.getDeviceList(null, list);
+        try
+        {
+            assertEquals(list.hashCode(), list.hashCode());
+        }
+        finally
+        {
+            LibUsb.freeDeviceList(list, true);
+        }
+    }
+    
+    /**
+     * Tests the {@link DeviceList#toString()} method
+     */
+    @Test
+    public void testToString()
+    {
+        assumeUsbTestsEnabled();
+        DeviceList list = new DeviceList();
+        LibUsb.getDeviceList(null, list);
+        try
+        {
+            assertNotNull(list.toString());
+            assertTrue(list.toString().length() > 0);
+        }
+        finally
+        {
+            LibUsb.freeDeviceList(list, true);
+        }
+    }
+    
+    /**
+     * Tests the {@link DeviceList#getPointer()} method
+     */
+    @Test
+    public void testGe()
+    {
+        assumeUsbTestsEnabled();
+        assumeUsbTestsEnabled();
+        DeviceList list = new DeviceList();
+        assertEquals(0, list.getPointer());
+        LibUsb.getDeviceList(null, list);
+        try
+        {
+            assertNotEquals(0, list.getPointer());
+        }
+        finally
+        {
+            LibUsb.freeDeviceList(list, true);
+        }
+    }
+}