From f683c378d17c68089266971078a75beb935052c8 Mon Sep 17 00:00:00 2001
From: sahar <sahmaisary@yahoo.com>
Date: Fri, 18 Feb 2022 00:10:35 +0100
Subject: [PATCH] UsbPlayerTest.quieter_10_Test Forth Case

---
 src/main/java/device/usbPlayer/UsbPlayer.java     | 8 +++++---
 src/test/java/device/usbPlayer/UsbPlayerTest.java | 9 ++++++++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index ea93e00..034c19d 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -136,9 +136,11 @@ public class UsbPlayer implements Device {
     }
 
     public void quieter_10() {
-        Lautstaerke -= 10;
-        if (Lautstaerke < 0) {
-            Lautstaerke = 0;
+        if(this.soundWas == -1) {
+            Lautstaerke -= 10;
+            if (Lautstaerke < 0) {
+                Lautstaerke = 0;
+            }
         }
     }
 
diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index 48ffd9c..f222f15 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -240,10 +240,17 @@ class UsbPlayerTest {
         UsbPlayer up3 = new UsbPlayer(USBDrive);
         up3.quieter_10();
 
+        //forth case
+        UsbPlayer up4 = new UsbPlayer(USBDrive);
+        up4.setLautstaerke(11);
+        up4.mute();
+        up4.quieter_10();
+
         return Stream.of(
                 Arguments.of("Volume was 10, should be 0 ", up1, 0),
                 Arguments.of("Volume was 50, should be 20 ", up2, 20),
-                Arguments.of("Volume was 0, should stay 0 ", up3, 0)
+                Arguments.of("Volume was 0, should stay 0 ", up3, 0),
+                Arguments.of("Volume is muted,no change can be made ", up4, 0)
         );
     }