Merge remote-tracking branch 'origin/master'

# Conflicts:
#	src/test/java/device/usbPlayer/UsbPlayerTest.java

src/test/java/device/usbPlayer/UsbPlayerTest.java

@@ -5,7 +5,6 @@ import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
-import java.util.ArrayList;
 import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -15,6 +14,24 @@ class UsbPlayerTest {
 
     UsbPlayer up = new UsbPlayer();
 
+    @ParameterizedTest
+    @MethodSource("quieterOptions")
+    void quieterTest(String testName, UsbPlayer inputPlay, int expectedResult) {
+        int volumeNum = inputPlay.getLautstaerke();
+        assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> quieterOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.quieter();
+        UsbPlayer up2 = new UsbPlayer();
+        up2.setLautstaerke(10);
+        up2.quieter();
+        return Stream.of(
+                Arguments.of("Volume must stay 0 ", up1, 0),
+                Arguments.of("Volume must be 9 ", up2, 9)
+        );
+    }
 
 /*
     @Test
@@ -59,4 +76,5 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
                 Arguments.of("Volume is : 100 ", up2, 100)
         );
     }
+ */
 }