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/*
* Copyright (C) 2019 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 com.android.server
import androidx.test.filters.SmallTest
import androidx.test.runner.AndroidJUnit4
import com.android.server.NetIdManager.MIN_NET_ID
import com.android.testutils.assertThrows
import com.android.testutils.ExceptionUtils.ThrowingRunnable
import org.junit.Test
import org.junit.runner.RunWith
import kotlin.test.assertEquals
@RunWith(AndroidJUnit4::class)
@SmallTest
class NetIdManagerTest {
@Test
fun testReserveReleaseNetId() {
val manager = NetIdManager(MIN_NET_ID + 4)
assertEquals(MIN_NET_ID, manager.reserveNetId())
assertEquals(MIN_NET_ID + 1, manager.reserveNetId())
assertEquals(MIN_NET_ID + 2, manager.reserveNetId())
assertEquals(MIN_NET_ID + 3, manager.reserveNetId())
manager.releaseNetId(MIN_NET_ID + 1)
manager.releaseNetId(MIN_NET_ID + 3)
// IDs only loop once there is no higher ID available
assertEquals(MIN_NET_ID + 4, manager.reserveNetId())
assertEquals(MIN_NET_ID + 1, manager.reserveNetId())
assertEquals(MIN_NET_ID + 3, manager.reserveNetId())
assertThrows(IllegalStateException::class.java, ThrowingRunnable { manager.reserveNetId() })
manager.releaseNetId(MIN_NET_ID + 5)
// Still no ID available: MIN_NET_ID + 5 was not reserved
assertThrows(IllegalStateException::class.java, ThrowingRunnable { manager.reserveNetId() })
manager.releaseNetId(MIN_NET_ID + 2)
// Throwing an exception still leaves the manager in a working state
assertEquals(MIN_NET_ID + 2, manager.reserveNetId())
}
}
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