BordComputerTest.changeDeviceTest third case

src/main/java/BordComputer.java

@@ -1,4 +1,6 @@
 import device.Device;
+import device.cdPlayer.CD;
+import device.cdPlayer.CDPlayer;
 
 import java.io.FileReader;
 import java.lang.reflect.InvocationTargetException;
@@ -46,6 +48,22 @@ public class BordComputer {
         //setting activeDevice
         activeDevice = installedDevices[0];
 
-        return null;
+        String infoText="";
+        if(activeDevice instanceof CDPlayer){
+            CDPlayer cdPlayer=(CDPlayer) activeDevice;
+            String[] audioPlayList=new String[]{"Audio 01","Audio 02","Audio 03","Audio 04","Audio 05"};
+            //some CDs
+            CD audioCD1=new CD("Audio",audioPlayList);
+            audioCD1.setAlbumName("Love Songs");
+
+            cdPlayer.tapOnCdFlap();
+            cdPlayer.setCD(audioCD1);
+            cdPlayer.tapOnCdFlap();
+            cdPlayer.setInfoText();
+            infoText = cdPlayer.getInfoText();
+        }else{
+            infoText=activeDevice.getInfoText()+" ist activate";
+        }
+        return infoText;
     }
 }

src/test/java/BordComputerTest.java

@@ -92,6 +92,8 @@ class BordComputerTest {
         }else if (caseNr == 2) {
             Device currentDevice = inputBC.activeDevice;
             assertThat(currentDevice).describedAs(testName).isNotEqualTo(prvDevice);
+        }else if (caseNr == 3) {
+            assertThat(inputBC.changeDevice()).describedAs(testName).isNotNull();
         }
     }
 
@@ -112,11 +114,18 @@ class BordComputerTest {
         Device prvDevice = bc1.activeDevice;
         m =bc1.changeDevice();
 
+        //third case
+        BordComputer bc2 = new BordComputer();
+        bc2.readConfig();
+        bc2.setDevices();
+        m =bc2.changeDevice();
+
 
 
         return Stream.of(
                 Arguments.of("The order of the installedDevices should be changed ", bc,currentDevices,null,"",1),
-                Arguments.of("The active Device should be changed ", bc1,null,prvDevice,"",2)
+                Arguments.of("The active Device should be changed ", bc1,null,prvDevice,"",2),
+                Arguments.of("The new Device returns a String ", bc2,null,prvDevice,bc2.activeDevice.toString(),3)
         );
     }
 }