diff --git a/pom.xml b/pom.xml
index 856c222..088239d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -275,13 +275,6 @@
       <version>1.2.0-SNAPSHOT</version>
       <scope>test</scope>
     </dependency> 
-    <dependency>
-      <groupId>org.usb4java</groupId>
-      <artifactId>libusb4java</artifactId>
-      <classifier>linux-x86</classifier>
-      <version>1.2.0-SNAPSHOT</version>
-      <scope>test</scope>
-    </dependency> 
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
diff --git a/src/test/java/org/usb4java/BosDescriptorTest.java b/src/test/java/org/usb4java/BosDescriptorTest.java
index 6f736cd..82db403 100644
--- a/src/test/java/org/usb4java/BosDescriptorTest.java
+++ b/src/test/java/org/usb4java/BosDescriptorTest.java
@@ -6,12 +6,11 @@
 package org.usb4java;
 
 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;
-import org.usb4java.BosDescriptor;
-import org.usb4java.LibUsb;
 
 /**
  * Tests the {@link BosDescriptor} class.
@@ -29,9 +28,11 @@ public class BosDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new BosDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new BosDescriptor();
+        }
     }
 
     /**
@@ -40,7 +41,10 @@ public class BosDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/BosDevCapabilityDescriptorTest.java b/src/test/java/org/usb4java/BosDevCapabilityDescriptorTest.java
index 3f5fd73..afd3fb2 100644
--- a/src/test/java/org/usb4java/BosDevCapabilityDescriptorTest.java
+++ b/src/test/java/org/usb4java/BosDevCapabilityDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class BosDevCapabilityDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new BosDevCapabilityDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new BosDevCapabilityDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class BosDevCapabilityDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/ConfigDescriptorTest.java b/src/test/java/org/usb4java/ConfigDescriptorTest.java
index fbac11d..69b056b 100644
--- a/src/test/java/org/usb4java/ConfigDescriptorTest.java
+++ b/src/test/java/org/usb4java/ConfigDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class ConfigDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new ConfigDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new ConfigDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class ConfigDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/ContainerIdDescriptorTest.java b/src/test/java/org/usb4java/ContainerIdDescriptorTest.java
index 63976a0..3540dcb 100644
--- a/src/test/java/org/usb4java/ContainerIdDescriptorTest.java
+++ b/src/test/java/org/usb4java/ContainerIdDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class ContainerIdDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new ContainerIdDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new ContainerIdDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class ContainerIdDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/DeviceDescriptorTest.java b/src/test/java/org/usb4java/DeviceDescriptorTest.java
index 35023dd..58c4664 100644
--- a/src/test/java/org/usb4java/DeviceDescriptorTest.java
+++ b/src/test/java/org/usb4java/DeviceDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class DeviceDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new DeviceDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new DeviceDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class DeviceDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/EndpointDescriptorTest.java b/src/test/java/org/usb4java/EndpointDescriptorTest.java
index f3d3c1e..021f5b7 100644
--- a/src/test/java/org/usb4java/EndpointDescriptorTest.java
+++ b/src/test/java/org/usb4java/EndpointDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class EndpointDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new EndpointDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new EndpointDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class EndpointDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/InterfaceDescriptorTest.java b/src/test/java/org/usb4java/InterfaceDescriptorTest.java
index e570958..baade23 100644
--- a/src/test/java/org/usb4java/InterfaceDescriptorTest.java
+++ b/src/test/java/org/usb4java/InterfaceDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class InterfaceDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new InterfaceDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new InterfaceDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class InterfaceDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/InterfaceTest.java b/src/test/java/org/usb4java/InterfaceTest.java
index 03fb7f7..80a8f10 100644
--- a/src/test/java/org/usb4java/InterfaceTest.java
+++ b/src/test/java/org/usb4java/InterfaceTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class InterfaceTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new Interface();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new Interface();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class InterfaceTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/LibUSBDeviceTest.java b/src/test/java/org/usb4java/LibUSBDeviceTest.java
index 29710cd..32570d5 100644
--- a/src/test/java/org/usb4java/LibUSBDeviceTest.java
+++ b/src/test/java/org/usb4java/LibUSBDeviceTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
@@ -62,20 +63,23 @@ public class LibUSBDeviceTest
     @Before
     public void setUp()
     {
-        this.context = new Context();
-        LibUsb.init(this.context);
-        try
+        if (isUsbTestsEnabled())
         {
-            this.device = this.findTestDevice();
-            if (this.device == null)
+            this.context = new Context();
+            LibUsb.init(this.context);
+            try
             {
-                throw new IllegalStateException("Need at least one USB device "
-                    + "with at least one endpoint to execute this test");
+                this.device = this.findTestDevice();
+                if (this.device == null)
+                {
+                    throw new IllegalStateException("Need at least one USB device "
+                        + "with at least one endpoint to execute this test");
+                }
+            }
+            catch (final Throwable e)
+            {
+                this.device = null;
             }
-        }
-        catch (final Throwable e)
-        {
-            this.device = null;
         }
     }
 
@@ -145,13 +149,16 @@ public class LibUSBDeviceTest
     @After
     public void tearDown()
     {
-        if (this.device != null)
+        if (isUsbTestsEnabled())
         {
-            LibUsb.unrefDevice(this.device);
-        }
-        if (this.context != null)
-        {
-            LibUsb.exit(this.context);
+            if (this.device != null)
+            {
+                LibUsb.unrefDevice(this.device);
+            }
+            if (this.context != null)
+            {
+                LibUsb.exit(this.context);
+            }
         }
     }
 
diff --git a/src/test/java/org/usb4java/SsEndpointCompanionDescriptorTest.java b/src/test/java/org/usb4java/SsEndpointCompanionDescriptorTest.java
index 654a8b5..74affbe 100644
--- a/src/test/java/org/usb4java/SsEndpointCompanionDescriptorTest.java
+++ b/src/test/java/org/usb4java/SsEndpointCompanionDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class SsEndpointCompanionDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new SsEndpointCompanionDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new SsEndpointCompanionDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class SsEndpointCompanionDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/SsUsbDeviceCapabilityDescriptorTest.java b/src/test/java/org/usb4java/SsUsbDeviceCapabilityDescriptorTest.java
index f523a9b..76a2388 100644
--- a/src/test/java/org/usb4java/SsUsbDeviceCapabilityDescriptorTest.java
+++ b/src/test/java/org/usb4java/SsUsbDeviceCapabilityDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class SsUsbDeviceCapabilityDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new SsUsbDeviceCapabilityDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new SsUsbDeviceCapabilityDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class SsUsbDeviceCapabilityDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/Usb20ExtensionDescriptorTest.java b/src/test/java/org/usb4java/Usb20ExtensionDescriptorTest.java
index b7dc479..752ace0 100644
--- a/src/test/java/org/usb4java/Usb20ExtensionDescriptorTest.java
+++ b/src/test/java/org/usb4java/Usb20ExtensionDescriptorTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class Usb20ExtensionDescriptorTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.descriptor = new Usb20ExtensionDescriptor();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.descriptor = new Usb20ExtensionDescriptor();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class Usb20ExtensionDescriptorTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/VersionTest.java b/src/test/java/org/usb4java/VersionTest.java
index 16779ed..b8843c1 100644
--- a/src/test/java/org/usb4java/VersionTest.java
+++ b/src/test/java/org/usb4java/VersionTest.java
@@ -6,6 +6,7 @@
 package org.usb4java;
 
 import static org.usb4java.test.UsbAssume.assumeUsbTestsEnabled;
+import static org.usb4java.test.UsbAssume.isUsbTestsEnabled;
 
 import org.junit.After;
 import org.junit.Before;
@@ -29,9 +30,11 @@ public class VersionTest
     @Before
     public void setUp()
     {
-        assumeUsbTestsEnabled();
-        LibUsb.init(null);
-        this.version = new Version();
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.init(null);
+            this.version = new Version();
+        }
     }
 
     /**
@@ -40,7 +43,10 @@ public class VersionTest
     @After
     public void tearDown()
     {
-        LibUsb.exit(null);
+        if (isUsbTestsEnabled())
+        {
+            LibUsb.exit(null);
+        }
     }
 
     /**
diff --git a/src/test/java/org/usb4java/test/UsbAssume.java b/src/test/java/org/usb4java/test/UsbAssume.java
index 1a2494a..226708d 100644
--- a/src/test/java/org/usb4java/test/UsbAssume.java
+++ b/src/test/java/org/usb4java/test/UsbAssume.java
@@ -23,19 +23,19 @@ public class UsbAssume
 
     /** If TCK tests are to be executed. */
     private static Boolean tckTests;
-
+    
     /**
-     * Assume that USB tests are enabled. Call this in the first line of
-     * tests method or preparation methods when you want to ignore the
-     * tests when the system is not able to run the tests anyway.
+     * Check if USB tests are enabled.
      * 
      * USB tests can be controlled with the system property USB_TESTS. When
      * set to true then USB tests are always run, if set to false then they
      * are never run. If this property is not set then the command-line tool
      * lsusb is called. If this tool returned at least two lines of text then
      * USB tests are enabled. In all other cases they are disabled.
+     * 
+     * @return True if USB tests are enabled, false if not.
      */
-    public static void assumeUsbTestsEnabled()
+    public static boolean isUsbTestsEnabled()
     {
         if (usbTests == null && System.getProperty("USB_TESTS") != null)
             usbTests = Boolean.valueOf(System.getProperty("USB_TESTS"));
@@ -77,8 +77,27 @@ public class UsbAssume
                 // not be run.
             }
         }
-        assumeTrue("This test is ignored when USB_TESTS property is not set",
-            usbTests);
+        return usbTests;
+    }
+
+    /**
+     * Assume that USB tests are enabled. Call this in the first line of
+     * tests method or preparation methods when you want to ignore the
+     * tests when the system is not able to run the tests anyway.
+     * 
+     * USB tests can be controlled with the system property USB_TESTS. When
+     * set to true then USB tests are always run, if set to false then they
+     * are never run. If this property is not set then the command-line tool
+     * lsusb is called. If this tool returned at least two lines of text then
+     * USB tests are enabled. In all other cases they are disabled.
+     */
+    public static void assumeUsbTestsEnabled()
+    {
+        if (!isUsbTestsEnabled())
+        {
+            assumeTrue("This test is ignored when USB_TESTS property is not set",
+                usbTests);
+        }
     }
 
     /**