test(libSceAudioOut): cover mute and unmute restoring the volume

Muting at 100, at 90 and at 0 keeps the volume, and unmuting returns it.

core/libs/prx/libSceAudioOut/tests/HostVolume.cpp

@@ -13,6 +13,7 @@ void require(bool condition, const char* message) {
 void defaultState() {
     HostVolume state;
     require(state.Volume() == 100, "the volume starts at 100");
+    require(!state.Muted(), "the host volume starts unmuted");
 }
 
 void stepsDown() {
@@ -46,6 +47,29 @@ void stepsStopAtMaximum() {
     require(state.Volume() == 100, "the volume never goes above 100");
 }
 
+void muteKeepsVolume() {
+    HostVolume state;
+    state.VolumeDown();
+    state.VolumeDown();
+    require(state.Volume() == 90, "two steps down give 90");
+    require(state.ToggleMute(), "muting changes the state");
+    require(state.Muted() && state.Volume() == 90, "muting leaves the volume alone");
+    require(state.ToggleMute(), "unmuting changes the state");
+    require(!state.Muted() && state.Volume() == 90, "unmuting restores the volume that was set");
+}
+
+void muteAtZeroAndMaximum() {
+    HostVolume state;
+    state.ToggleMute();
+    require(state.Volume() == 100, "muting at 100 keeps 100");
+    state.ToggleMute();
+    for (int step = 0; step < 20; ++step) state.VolumeDown();
+    state.ToggleMute();
+    require(state.Muted() && state.Volume() == 0, "muting at 0 keeps 0");
+    state.ToggleMute();
+    require(!state.Muted() && state.Volume() == 0, "unmuting at 0 leaves 0");
+}
+
 }
 
 int main() try {
@@ -54,6 +78,8 @@ int main() try {
     stepsStopAtZero();
     stepsUp();
     stepsStopAtMaximum();
+    muteKeepsVolume();
+    muteAtZeroAndMaximum();
     std::puts("host volume tests passed");
     return 0;
 } catch (const std::exception& error) {