diff --git a/pom.xml b/pom.xml
index bf55855..23af233 100644
--- a/pom.xml
+++ b/pom.xml
@@ -54,6 +54,7 @@
   <properties>
     <releasesUrl>http://www.ailis.de/nexus/content/repositories/releases/de/ailis/${project.artifactId}/${project.artifactId}/${project.version}</releasesUrl>
     <snapshotsUrl>http://www.ailis.de/nexus/content/repositories/snapshots/de/ailis/${project.artifactId}/${project.artifactId}</snapshotsUrl>
+    <powermock.version>1.4.7</powermock.version>
   </properties>
   
   <build>
@@ -138,7 +139,20 @@
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.8.2</version>
+      <scope>test</scope>
     </dependency> 
+    <dependency>
+      <groupId>org.powermock</groupId>
+      <artifactId>powermock-module-junit4</artifactId>
+      <version>${powermock.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.powermock</groupId>
+      <artifactId>powermock-api-mockito</artifactId>
+      <version>${powermock.version}</version>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>javax.usb</groupId>
       <artifactId>usb</artifactId>
diff --git a/src/test/java/de/ailis/usb4java/ServicesTest.java b/src/test/java/de/ailis/usb4java/ServicesTest.java
new file mode 100644
index 0000000..70bd648
--- /dev/null
+++ b/src/test/java/de/ailis/usb4java/ServicesTest.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+
+/**
+ * Tests the Services class.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest( { Services.class })
+public class ServicesTest
+{
+    @Test
+    public void testConstructor()
+    {
+    }
+}
diff --git a/src/test/java/de/ailis/usb4java/descriptors/LibUsbEndpointDescriptorTest.java b/src/test/java/de/ailis/usb4java/descriptors/LibUsbEndpointDescriptorTest.java
new file mode 100644
index 0000000..a416c5b
--- /dev/null
+++ b/src/test/java/de/ailis/usb4java/descriptors/LibUsbEndpointDescriptorTest.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.descriptors;
+
+import static org.junit.Assert.assertEquals;
+import static org.powermock.api.mockito.PowerMockito.when;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+import de.ailis.usb4java.jni.USB_Descriptor_Header;
+import de.ailis.usb4java.jni.USB_Endpoint_Descriptor;
+
+
+/**
+ * Tests the LibUsbEndpointDescriptor class.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest( { USB_Endpoint_Descriptor.class, USB_Descriptor_Header.class })
+public class LibUsbEndpointDescriptorTest
+{
+    /** The descriptor to test. */
+    private static LibUsbEndpointDescriptor descriptor;
+
+
+    /**
+     * Prepares the test subject.
+     */
+
+    @BeforeClass
+    public static void beforeClass()
+    {
+        final USB_Endpoint_Descriptor mock = PowerMockito.mock(USB_Endpoint_Descriptor.class);
+        when(mock.bEndpointAddress()).thenReturn(200);
+        when(mock.bmAttributes()).thenReturn(201);
+        when(mock.wMaxPacketSize()).thenReturn(40000);
+        when(mock.bInterval()).thenReturn(202);
+        descriptor = new LibUsbEndpointDescriptor(mock);
+    }
+
+
+    /**
+     * Tests the bEndpointAddress() method.
+     */
+
+    @Test
+    public void testBEndpointAddress()
+    {
+        assertEquals((byte) 200, descriptor.bEndpointAddress());
+    }
+
+
+    /**
+     * Tests the bmAttributes() method.
+     */
+
+    @Test
+    public void testBmAttributes()
+    {
+        assertEquals((byte) 201, descriptor.bmAttributes());
+    }
+
+
+    /**
+     * Tests the wMaxPacketSize() method.
+     */
+
+    @Test
+    public void testWMaxPacketSize()
+    {
+        assertEquals((short) 40000, descriptor.wMaxPacketSize());
+    }
+
+
+    /**
+     * Tests the bInterval() method.
+     */
+
+    @Test
+    public void testBInterval()
+    {
+        assertEquals((byte) 202, descriptor.bInterval());
+    }
+}
diff --git a/src/test/java/de/ailis/usb4java/jni/USB_Endpoint_Descriptor_Test.java b/src/test/java/de/ailis/usb4java/jni/USB_Endpoint_Descriptor_Test.java
new file mode 100644
index 0000000..2a4a9fd
--- /dev/null
+++ b/src/test/java/de/ailis/usb4java/jni/USB_Endpoint_Descriptor_Test.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jni;
+
+import static org.junit.Assert.assertNotNull;
+import static org.powermock.api.mockito.PowerMockito.mock;
+import static org.powermock.api.mockito.PowerMockito.when;
+
+import java.nio.ByteBuffer;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+
+/**
+ * Tests the Services class.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest({ USB_Endpoint_Descriptor.class })
+public class USB_Endpoint_Descriptor_Test
+{
+    /** The descriptor to test. */
+    private static USB_Endpoint_Descriptor descriptor;
+
+
+    /**
+     * Prepares the test class.
+     */
+
+    @BeforeClass
+    public static void beforeClass()
+    {
+        descriptor = new USB_Endpoint_Descriptor(ByteBuffer.allocateDirect(18));
+    }
+
+
+    /**
+     * Tests the dump method.
+     * @throws Exception
+     */
+
+    @Test
+    public void testDump() throws Exception
+    {
+        final USB_Endpoint_Descriptor descriptor = mock(USB_Endpoint_Descriptor.class);
+        when(descriptor.bDescriptorType()).thenReturn(1);
+        when(descriptor.bEndpointAddress()).thenReturn(2);
+        when(descriptor.bInterval()).thenReturn(3);
+        when(descriptor.bLength()).thenReturn(4);
+        when(descriptor.bmAttributes()).thenReturn(5);
+        when(descriptor.bRefresh()).thenReturn(6);
+        when(descriptor.bSynchAddress()).thenReturn(7);
+        when(descriptor.extra()).thenReturn(ByteBuffer.allocateDirect(4));
+        when(descriptor.extralen()).thenReturn(2);
+        when(descriptor.dump()).thenCallRealMethod();
+        final String actual = descriptor.dump();
+        assertNotNull(actual);
+    }
+}