Merge "Helper function to return the unique name for subscription info"

        return displayNames.getOrDefault(subscriptionId, "");

    }

    /**

     * Return the display name for a subscription, which is guaranteed to be unique.

     * The logic to create this name has the following order of operations:

     * 1) If the original display name is not unique, the last four digits of the phone number

     *    will be appended.

     * 2) If the phone number is not visible or the last four digits are shared with another

     *    subscription, the subscription id will be appended to the original display name.

     * More details can be found at go/unique-sub-display-names.

     *

     * @return map of active subscription ids to diaplay names.

     */

    @VisibleForTesting

    public static CharSequence getUniqueSubscriptionDisplayName(

            SubscriptionInfo info, Context context) {

        return getUniqueSubscriptionDisplayName(info.getSubscriptionId(), context);

    }

    public static String getDisplayName(SubscriptionInfo info) {

        final CharSequence name = info.getDisplayName();

        if (name != null) {

        assertTrue(TextUtils.isEmpty(name));

    }

    @Test

    public void getUniqueDisplayName_fullSubscriptionInfo_correctNameReturned() {

        // Each subscription's default display name is unique.

        final SubscriptionInfo info1 = mock(SubscriptionInfo.class);

        when(info1.getSubscriptionId()).thenReturn(SUBID_1);

        when(info1.getDisplayName()).thenReturn(CARRIER_1);

        when(mSubMgr.getActiveSubscriptionInfoList()).thenReturn(

                Arrays.asList(info1));

        TelephonyManager sub1Telmgr = mock(TelephonyManager.class);

        when(sub1Telmgr.getLine1Number()).thenReturn("1112223333");

        when(mTelMgr.createForSubscriptionId(SUBID_1)).thenReturn(sub1Telmgr);

        final CharSequence name =

                SubscriptionUtil.getUniqueSubscriptionDisplayName(info1, mContext);

        assertThat(name).isNotNull();

        assertEquals(CARRIER_1, name);

    }

    @Test

    public void isInactiveInsertedPSim_nullSubInfo_doesNotCrash() {

        assertThat(SubscriptionUtil.isInactiveInsertedPSim(null)).isFalse();