added second test case for RadioPlayer getOptions() & added productive code

src/main/java/device/radioPlayer/RadioPlayer.java

@@ -2,8 +2,10 @@ package device.radioPlayer;
 
 import device.Device;
 
+import java.lang.reflect.Method;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
+import java.util.Arrays;
 
 public class RadioPlayer implements Device {
 
@@ -161,7 +163,10 @@ public class RadioPlayer implements Device {
 
     @Override
     public String[] getOptions() {
-        return new String[0];
+        Method[] methods = this.getClass().getDeclaredMethods();
+        String[] returnMethods = Arrays.stream(methods).map(Method::getName).toArray(String[]::new);
+
+        return returnMethods;
     }
 
     @Override

src/test/java/device/radioPlayer/RadioPlayerTest.java

@@ -420,18 +420,17 @@ class RadioPlayerTest {
     }
     @ParameterizedTest
     @MethodSource("getOptionsOptions")
-    void testGetOptions(String testName, RadioPlayer testRp) {
-
-        assertThat(testRp.getOptions()).describedAs(testName).isNotEqualTo(null);
+    void testGetOptions(String testName,String testTyp, RadioPlayer testRp) {
+        if(testTyp.equals("notNull")) assertThat(testRp.getOptions()).describedAs(testName).isNotEqualTo(null);
+        if(testTyp.equals("arrayLengthGreater0")) assertThat(testRp.getOptions().length).describedAs(testName).isNotEqualTo(0);
     }
 
     static Stream<Arguments> getOptionsOptions() {
         RadioPlayer rp = new RadioPlayer();
 
-
         return Stream.of(
-                Arguments.of("returnValue of getOptions is not null", rp)
-
+                Arguments.of("returnValue of getOptions is not null", "notNull", rp),
+                Arguments.of("should not return an empty array", "arrayLengthGreater0", rp)
         );
     }
 }