added third test case for RadioPlayer getOptions()

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

@@ -157,7 +157,8 @@ public class RadioPlayer implements Device {
 
     private String buildInfoText() {
         String infoText = playedStation;
-        if(regionPlaylist.contains(playedStation)) return ("Regional playlist: " + (regionPlaylist.indexOf(playedStation) + 1) + infoText);
+        if (regionPlaylist.contains(playedStation))
+            return ("Regional playlist: " + (regionPlaylist.indexOf(playedStation) + 1) + infoText);
         else return ("Saved playlist: " + (savedPlaylist.indexOf(playedStation) + 1) + infoText);
     }
 

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

@@ -1,12 +1,17 @@
 package device.radioPlayer;
 
 
+import device.Device;
 import org.assertj.core.util.Strings;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -366,6 +371,7 @@ class RadioPlayerTest {
                 Arguments.of("Test for mute RadioPlayer if volume is saved before muting", "saved", rp1, 30)
         );
     }
+
     @Test
     void testUnmute() {
         RadioPlayer rp = new RadioPlayer();
@@ -383,8 +389,10 @@ class RadioPlayerTest {
         else if (testTyp.contains("station")) bool = testRp.getInfoText().contains(testRp.playedStation);
         else if (testTyp.contains("region")) bool = testRp.getInfoText().contains("Regional playlist");
         else if (testTyp.contains("saved")) bool = testRp.getInfoText().contains("Saved playlist");
-        else if(testTyp.contains("savedNum")) bool = testRp.getInfoText().contains(("0") + testRp.savedPlaylist.indexOf(testRp.playedStation) + 1);
-        else if(testTyp.contains("regionNum")) bool = testRp.getInfoText().contains(("0") + testRp.regionPlaylist.indexOf(testRp.playedStation) + 1);
+        else if (testTyp.contains("savedNum"))
+            bool = testRp.getInfoText().contains(("0") + testRp.savedPlaylist.indexOf(testRp.playedStation) + 1);
+        else if (testTyp.contains("regionNum"))
+            bool = testRp.getInfoText().contains(("0") + testRp.regionPlaylist.indexOf(testRp.playedStation) + 1);
         else if (testTyp.contains("stationInfo")) bool = testRp.getInfoText().contains("Now playing");
         else bool = testRp.getInfoText().contains("Now playing");
 
@@ -418,11 +426,20 @@ class RadioPlayerTest {
                 Arguments.of("Test for getInfoText not contains station info if station not has one", "noStationInfo", rp7, false)
         );
     }
+
     @ParameterizedTest
     @MethodSource("getOptionsOptions")
     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);
+        if (testTyp.equals("arrayLengthGreater0"))
+            assertThat(testRp.getOptions().length).describedAs(testName).isNotEqualTo(0);
+        else {
+            Method[] interfaceMethods = Device.class.getDeclaredMethods();
+            List<String> deviceMethods = new ArrayList<>(Arrays.asList(testRp.getOptions()));
+            for (Method interfaceMethod : interfaceMethods) {
+                assertThat(deviceMethods.contains(interfaceMethod.getName())).describedAs(testName).isEqualTo(true);
+            }
+        }
     }
 
     static Stream<Arguments> getOptionsOptions() {
@@ -430,7 +447,8 @@ class RadioPlayerTest {
 
         return Stream.of(
                 Arguments.of("returnValue of getOptions is not null", "notNull", rp),
-                Arguments.of("should not return an empty array", "arrayLengthGreater0", rp)
+                Arguments.of("should not return an empty array", "arrayLengthGreater0", rp),
+                Arguments.of("Test if all methods declared in interface device are available", "device", rp)
         );
     }
 }