added fifth test case for readConfig() & productive code

and added first test case for setDevices() & productive code

Geraete.config

@@ -1,4 +1,4 @@
-CD=device.cdPlayer.CdPlayer
+CD=device.cdPlayer.CDPlayer
 Radio=device.radioPlayer.RadioPlayer
 USB=device.usbPlayer.UsbPlayer
 

src/main/java/BordComputer.java

@@ -1,10 +1,15 @@
+import device.Device;
+
 import java.io.FileReader;
+import java.lang.reflect.InvocationTargetException;
 import java.util.Arrays;
 import java.util.Properties;
 
 public class BordComputer {
 
     String[] deviceNames;
+    Device[] installedDevices;
+    Device activeDevice = null;
 
     public void readConfig() {
 
@@ -15,8 +20,16 @@ public class BordComputer {
             Arrays.sort(values);
             deviceNames = new String[values.length];
             System.arraycopy(values, 0, deviceNames, 0, properties.size());
+            installedDevices=new Device[values.length];
         } catch (Exception e) {
             e.printStackTrace();
         }
+        activeDevice =installedDevices[0];
+    }
+
+    public void setDevices() throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, ClassNotFoundException {
+        Class<?> c;
+        c= Class.forName(deviceNames[0]);
+        installedDevices[0] = (Device) c.getConstructor().newInstance();
     }
 }

src/test/java/BordComputerTest.java

@@ -1,3 +1,4 @@
+import device.Device;
 import device.radioPlayer.RadioPlayer;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -5,6 +6,7 @@ import org.junit.jupiter.params.provider.MethodSource;
 
 import java.io.FileReader;
 import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
 import java.util.Properties;
 import java.util.stream.Stream;
 
@@ -17,15 +19,10 @@ class BordComputerTest {
     @MethodSource("readConfigOptions")
     void readConfigTest(String testName, String testTyp, BordComputer testBc, String expectedResult) {
         if (testTyp.equals("count")) {
-            int count = 0;
-            try (FileReader reader = new FileReader("Geraete.config")) {
-                Properties properties = new Properties();
-                properties.load(reader);
-                count = properties.size();
-            } catch (IOException e) {
-                e.printStackTrace();
+            assertThat(fileReaderCount()).describedAs(testName).isEqualTo(testBc.deviceNames.length);
         }
-            assertThat(count).describedAs(testName).isEqualTo(testBc.deviceNames.length);
+        if (testTyp.equals("count1")) {
+            assertThat(fileReaderCount()).describedAs(testName).isEqualTo(testBc.installedDevices.length);
         }
         if (testTyp.equals("item1")) {
             assertThat(testBc.deviceNames[0]).describedAs(testName).isEqualTo(expectedResult);
@@ -44,10 +41,37 @@ class BordComputerTest {
 
         return Stream.of(
                 Arguments.of("Check if file reader is getting every item in Geraete.config", "count", bc1, ""),
-                Arguments.of("Check if file reader is getting the first element", "item1", bc1, "device.cdPlayer.CdPlayer"),
+                Arguments.of("Check if file reader is getting the first element", "item1", bc1, "device.cdPlayer.CDPlayer"),
                 Arguments.of("Check if file reader is getting the second element", "item2", bc1, "device.radioPlayer.RadioPlayer"),
-                Arguments.of("Check if file reader is getting the third element", "item3", bc1, "device.usbPlayer.UsbPlayer")
+                Arguments.of("Check if file reader is getting the third element", "item3", bc1, "device.usbPlayer.UsbPlayer"),
+                Arguments.of("Test if installed devices has the length", "count1", bc1, "")
         );
     }
 
+    @ParameterizedTest
+    @MethodSource("setDevicesOptions")
+    void setDevicesTest(String testName, BordComputer testBc) {
+        Device dev = testBc.installedDevices[0];
+        assertThat(dev).describedAs(testName).isNotEqualTo(null);
+    }
+
+    static Stream<Arguments> setDevicesOptions() throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
+        BordComputer bc = new BordComputer();
+        bc.readConfig();
+        bc.setDevices();
+        return Stream.of(
+                Arguments.of("Test if installedDevices[0] is not null", bc)
+
+        );
+    }
+    public int fileReaderCount() {
+        int count = 0;
+        try (FileReader reader = new FileReader("Geraete.config")) {
+            Properties properties = new Properties();
+            properties.load(reader);
+            count = properties.size();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } return count;
+    }
 }