Fix TetherSettingsTest

import android.net.wifi.WifiManager;

import android.os.UserHandle;

import android.os.UserManager;

import android.util.FeatureFlagUtils;

import androidx.preference.Preference;

import com.android.settings.core.FeatureFlags;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

    @Test

    public void testTetherNonIndexableKeys_tetherAvailable_keysNotReturned() {

        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.TETHER_ALL_IN_ONE, false);

        // To let TetherUtil.isTetherAvailable return true, select one of the combinations

        setupIsTetherAvailable(true);

    @Test

    public void testTetherNonIndexableKeys_usbAvailable_usbKeyNotReturned() {

        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.TETHER_ALL_IN_ONE, false);

        // We can ignore the condition of Utils.isMonkeyRunning()

        // In normal case, monkey and robotest should not execute at the same time

        when(mConnectivityManager.getTetherableUsbRegexs()).thenReturn(new String[]{"dummyRegex"});

    @Test

    public void testTetherNonIndexableKeys_bluetoothAvailable_bluetoothKeyNotReturned() {

        FeatureFlagUtils.setEnabled(mContext, FeatureFlags.TETHER_ALL_IN_ONE, false);

        when(mConnectivityManager.getTetherableBluetoothRegexs())

                .thenReturn(new String[]{"dummyRegex"});