added third & fourth test for readConfig & productive code

src/main/java/BordComputer.java

@@ -1,4 +1,5 @@
 import java.io.FileReader;
+import java.util.Arrays;
 import java.util.Properties;
 
 public class BordComputer {
@@ -11,6 +12,7 @@ public class BordComputer {
             Properties properties = new Properties();
             properties.load(reader);
             String[] values = properties.values().toArray(new String[0]);
+            Arrays.sort(values);
             deviceNames = new String[values.length];
             System.arraycopy(values, 0, deviceNames, 0, properties.size());
         } catch (Exception e) {

src/test/java/BordComputerTest.java

@@ -30,6 +30,12 @@ class BordComputerTest {
         if (testTyp.equals("item1")) {
             assertThat(testBc.deviceNames[0]).describedAs(testName).isEqualTo(expectedResult);
         }
+        if (testTyp.equals("item2")) {
+            assertThat(testBc.deviceNames[1]).describedAs(testName).isEqualTo(expectedResult);
+        }
+        if (testTyp.equals("item3")) {
+            assertThat(testBc.deviceNames[2]).describedAs(testName).isEqualTo(expectedResult);
+        }
     }
 
     static Stream<Arguments> readConfigOptions() {
@@ -38,7 +44,9 @@ 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")
         );
     }