CDPlayer-Methods[play,louder,quieter] update.

src/test/java/device/cdPlayer/CDPlayerTest.java

@@ -1,7 +1,6 @@
 package device.cdPlayer;
 
 import device.cdPlayer.exceptions.*;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -121,5 +120,37 @@ class CDPlayerTest {
         );
     }
 
+    @ParameterizedTest
+    @MethodSource("quieterTestData")
+    void quieterTest(String testName,String testDirection, CDPlayer _cdPlayer,int anzClicks, int expectedResult) {
+        for (int i = 0; i < anzClicks; i++) {
+            _cdPlayer.quieter();
+        }
+
+        if(testDirection.equals("VolumeDecreased")){
+            for (int i = 0; i < 20; i++) {
+                _cdPlayer.louder();
+            }
+            for (int i = 0; i < anzClicks; i++) {
+                _cdPlayer.quieter();
+            }
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isEqualTo(expectedResult);
+        }
+        if(testDirection.equals("VolumeHasNotChanged")){
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isEqualTo(expectedResult);
+        }if(testDirection.equals("VolumeNotIncreased")){
+
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isNotEqualTo(expectedResult);
+        }
+    }
+
+    static Stream<Arguments> quieterTestData () {
+        CDPlayer cdPlayer=new CDPlayer();
+        return Stream.of(
+                Arguments.of("[getVolume() after 20x quieter() starting by 20] => VolumeHasDecreased","VolumeDecreased", cdPlayer, 19, 1),
+                Arguments.of("[getVolume() after 20x quieter() starting by 0] => VolumeHasNotChanged","VolumeHasNotChanged" ,cdPlayer,20,0),
+                Arguments.of("[getVolume() after 5x quieter() starting by 0] => VolumeNotIncreased","VolumeNotIncreased", cdPlayer,5,5)
+        );
+    }
 
 }