diff --git a/src/main/java/BordComputer.java b/src/main/java/BordComputer.java
index 7563899..c8b597a 100644
--- a/src/main/java/BordComputer.java
+++ b/src/main/java/BordComputer.java
@@ -35,4 +35,16 @@ public class BordComputer {
             installedDevices[i] = (Device) c.getConstructor().newInstance();
         }
     }
+
+    public String changeDevice() {
+        Device[] tempDevices = new Device[installedDevices.length];
+        tempDevices[0] = installedDevices[1];
+        tempDevices[1] = installedDevices[2];
+        tempDevices[2] = installedDevices[0];
+        //replaces the lists
+        installedDevices = tempDevices;
+        //setting activeDevice
+        activeDevice = installedDevices[0];
+        return null;
+    }
 }
diff --git a/src/test/java/BordComputerTest.java b/src/test/java/BordComputerTest.java
index 6772d99..1118e4a 100644
--- a/src/test/java/BordComputerTest.java
+++ b/src/test/java/BordComputerTest.java
@@ -81,4 +81,31 @@ class BordComputerTest {
         }
         return count;
     }
+
+    ////
+    @ParameterizedTest
+    @MethodSource("changeDeviceOptions")
+    void changeDeviceTest(String testName, BordComputer inputBC, Device[] oldDevices,Device prvDevice,String message ,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();
+        String m = bc.changeDevice();
+
+
+
+        return Stream.of(
+                Arguments.of("The order of the installedDevices should be changed ", bc,currentDevices,null,"",1)
+        );
+    }
 }
\ No newline at end of file