fix: create test sound directory if missing

Signed-off-by: Emilia Kurdybelska <emiliax.kurdybelska@intel.com>

Author: ekurdybx

test-case/check-selector-play.sh

@@ -83,6 +83,10 @@ generate_soundfile()
 # Checks for soundfiles needed for test, generates missing ones
 prepare_test_soundfiles()
 {
+    if [ ! -d "$HOME/Music" ]; then
+        mkdir "$HOME/Music"
+    fi
+
     for ch_nr in "${channels_to_test[@]}"
     do
         filename="$HOME/Music/${ch_nr}_channels_test.wav"