Move InterfaceParamsTest to frameworks/libs/net

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package android.net.util;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertFalse;

import static org.junit.Assert.assertNotNull;

import static org.junit.Assert.assertNull;

import static org.junit.Assert.assertTrue;

import androidx.test.filters.SmallTest;

import androidx.test.runner.AndroidJUnit4;

import com.android.net.module.util.NetworkStackConstants;

import org.junit.Test;

import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)

@SmallTest

public class InterfaceParamsTest {

    @Test

    public void testNullInterfaceReturnsNull() {

        assertNull(InterfaceParams.getByName(null));

    }

    @Test

    public void testNonExistentInterfaceReturnsNull() {

        assertNull(InterfaceParams.getByName("doesnotexist0"));

    }

    @Test

    public void testLoopback() {

        final InterfaceParams ifParams = InterfaceParams.getByName("lo");

        assertNotNull(ifParams);

        assertEquals("lo", ifParams.name);

        assertTrue(ifParams.index > 0);

        assertNotNull(ifParams.macAddr);

        assertFalse(ifParams.hasMacAddress);

        assertTrue(ifParams.defaultMtu >= NetworkStackConstants.ETHER_MTU);

    }

}