Merge "Make sure the test looper is prepared in HeadsetPhoneStateTest"

import android.content.Context;

import android.os.HandlerThread;

import android.os.IBinder;

import android.os.Looper;

import android.os.ServiceManager;

import android.telephony.PhoneStateListener;

import android.telephony.SubscriptionManager;

    @Before

    public void setUp() throws Exception {

        if (Looper.myLooper() == null) {

            Looper.prepare();

        }

        MockitoAnnotations.initMocks(this);

        // Mock SubscriptionManager.getDefaultSubscriptionId() to return a valid value

        when(mISub.getDefaultSubId()).thenReturn(SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);