[Audiosharing] Test getInstance for states

Test: atest -c com.android.settings.connecteddevice.audiosharing.audiostream
Flag: com.android.settingslib.flags.enable_le_audio_qr_code_private_broadcast_sharing
Bug: 345686602
Change-Id: Ic0f143b427966dfa039fca3bd0028e0c6f7382ab

tests/robotests/src/com/android/settings/connecteddevice/audiosharing/audiostreams/AddSourceBadCodeStateTest.java

@@ -58,6 +58,7 @@ public class AddSourceBadCodeStateTest {
 
     @Test
     public void testGetInstance() {
+        mInstance = AddSourceBadCodeState.getInstance();
         assertThat(mInstance).isNotNull();
         assertThat(mInstance).isInstanceOf(SyncedState.class);
     }

tests/robotests/src/com/android/settings/connecteddevice/audiosharing/audiostreams/AddSourceFailedStateTest.java

@@ -58,6 +58,7 @@ public class AddSourceFailedStateTest {
 
     @Test
     public void testGetInstance() {
+        mInstance = AddSourceFailedState.getInstance();
         assertThat(mInstance).isNotNull();
         assertThat(mInstance).isInstanceOf(SyncedState.class);
     }

tests/robotests/src/com/android/settings/connecteddevice/audiosharing/audiostreams/AddSourceWaitForResponseStateTest.java

@@ -80,6 +80,7 @@ public class AddSourceWaitForResponseStateTest {
 
     @Test
     public void testGetInstance() {
+        mInstance = AddSourceWaitForResponseState.getInstance();
         assertThat(mInstance).isNotNull();
         assertThat(mInstance).isInstanceOf(AudioStreamStateHandler.class);
     }

tests/robotests/src/com/android/settings/connecteddevice/audiosharing/audiostreams/SourceAddedStateTest.java

@@ -85,6 +85,7 @@ public class SourceAddedStateTest {
 
     @Test
     public void testGetInstance() {
+        mInstance = SourceAddedState.getInstance();
         assertThat(mInstance).isNotNull();
         assertThat(mInstance).isInstanceOf(SourceAddedState.class);
     }

tests/robotests/src/com/android/settings/connecteddevice/audiosharing/audiostreams/WaitForSyncStateTest.java

@@ -76,6 +76,7 @@ public class WaitForSyncStateTest {
 
     @Test
     public void testGetInstance() {
+        mInstance = WaitForSyncState.getInstance();
         assertThat(mInstance).isNotNull();
         assertThat(mInstance).isInstanceOf(AudioStreamStateHandler.class);
     }