diff --git a/src/main/java/BordComputer.java b/src/main/java/BordComputer.java
index 7563899..cfc05d2 100644
--- a/src/main/java/BordComputer.java
+++ b/src/main/java/BordComputer.java
@@ -35,4 +35,14 @@ public class BordComputer {
             installedDevices[i] = (Device) c.getConstructor().newInstance();
         }
     }
+
+    public void changeDevice() {
+        Device[] tempDevices=new Device[installedDevices.length];
+        tempDevices[0]=installedDevices[1];
+        tempDevices[1]=installedDevices[2];
+        tempDevices[2]=installedDevices[0];
+        //replaces the lists
+        installedDevices=tempDevices;
+
+    }
 }
diff --git a/src/test/java/BordComputerTest.java b/src/test/java/BordComputerTest.java
index 6772d99..eb9ab34 100644
--- a/src/test/java/BordComputerTest.java
+++ b/src/test/java/BordComputerTest.java
@@ -1,6 +1,7 @@
 import device.Device;
 import device.cdPlayer.CDPlayer;
 import device.radioPlayer.RadioPlayer;
+import device.usbPlayer.USB_Stick;
 import device.usbPlayer.UsbPlayer;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -80,5 +81,31 @@ class BordComputerTest {
             e.printStackTrace();
         }
         return count;
+    }//changeDevice()
+
+    @ParameterizedTest
+    @MethodSource("changeDeviceOptions")
+    void changeDeviceTest(String testName, BordComputer inputBC, Device[] oldDevices ,int caseNr) {
+        Device[] newDevicesList = inputBC.installedDevices.clone();
+        if (caseNr == 1) {
+            assertThat(newDevicesList).describedAs(testName).isNotEqualTo(oldDevices);
+        }
     }
+
+    static Stream<Arguments> changeDeviceOptions() throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
+
+        //first case
+        BordComputer bc = new BordComputer();
+        bc.readConfig();
+        bc.setDevices();
+        Device[] currentDevices = new Device[bc.installedDevices.length];
+        currentDevices = bc.installedDevices.clone();
+        bc.changeDevice();
+
+        return Stream.of(
+                Arguments.of("The order of the installedDevices should be changed ", bc,currentDevices,1)
+        );
+    }
+
+
 }
\ No newline at end of file