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/*
* Copyright (C) 2022 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.net.module.util
import androidx.test.filters.SmallTest
import androidx.test.runner.AndroidJUnit4
import org.junit.Test
import org.junit.runner.RunWith
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith
@RunWith(AndroidJUnit4::class)
@SmallTest
class PerUidCounterTest {
private val UID_A = 1000
private val UID_B = 1001
private val UID_C = 1002
@Test
fun testCounterMaximum() {
assertFailsWith<IllegalArgumentException> {
PerUidCounter(-1)
}
assertFailsWith<IllegalArgumentException> {
PerUidCounter(0)
}
val testLimit = 1000
val testCounter = PerUidCounter(testLimit)
assertEquals(0, testCounter[UID_A])
repeat(testLimit) {
testCounter.incrementCountOrThrow(UID_A)
}
assertEquals(testLimit, testCounter[UID_A])
assertFailsWith<IllegalStateException> {
testCounter.incrementCountOrThrow(UID_A)
}
assertEquals(testLimit, testCounter[UID_A])
}
@Test
fun testIncrementCountOrThrow() {
val counter = PerUidCounter(3)
// Verify the counters work independently.
counter.incrementCountOrThrow(UID_A)
counter.incrementCountOrThrow(UID_B)
counter.incrementCountOrThrow(UID_B)
counter.incrementCountOrThrow(UID_A)
counter.incrementCountOrThrow(UID_A)
assertEquals(3, counter[UID_A])
assertEquals(2, counter[UID_B])
assertFailsWith<IllegalStateException> {
counter.incrementCountOrThrow(UID_A)
}
counter.incrementCountOrThrow(UID_B)
assertFailsWith<IllegalStateException> {
counter.incrementCountOrThrow(UID_B)
}
// Verify exception can be triggered again.
assertFailsWith<IllegalStateException> {
counter.incrementCountOrThrow(UID_A)
}
assertFailsWith<IllegalStateException> {
repeat(3) {
counter.incrementCountOrThrow(UID_A)
}
}
assertEquals(3, counter[UID_A])
assertEquals(3, counter[UID_B])
assertEquals(0, counter[UID_C])
}
@Test
fun testDecrementCountOrThrow() {
val counter = PerUidCounter(3)
// Verify the count cannot go below zero.
assertFailsWith<IllegalStateException> {
counter.decrementCountOrThrow(UID_A)
}
assertFailsWith<IllegalStateException> {
repeat(5) {
counter.decrementCountOrThrow(UID_A)
}
}
// Verify the counters work independently.
counter.incrementCountOrThrow(UID_A)
counter.incrementCountOrThrow(UID_B)
assertEquals(1, counter[UID_A])
assertEquals(1, counter[UID_B])
assertFailsWith<IllegalStateException> {
repeat(3) {
counter.decrementCountOrThrow(UID_A)
}
}
assertFailsWith<IllegalStateException> {
counter.decrementCountOrThrow(UID_A)
}
assertEquals(0, counter[UID_A])
assertEquals(1, counter[UID_B])
// Verify mixing increment and decrement.
val largeCounter = PerUidCounter(100)
repeat(90) {
largeCounter.incrementCountOrThrow(UID_A)
}
repeat(70) {
largeCounter.decrementCountOrThrow(UID_A)
}
repeat(80) {
largeCounter.incrementCountOrThrow(UID_A)
}
assertFailsWith<IllegalStateException> {
largeCounter.incrementCountOrThrow(UID_A)
}
assertEquals(100, largeCounter[UID_A])
repeat(100) {
largeCounter.decrementCountOrThrow(UID_A)
}
assertFailsWith<IllegalStateException> {
largeCounter.decrementCountOrThrow(UID_A)
}
assertEquals(0, largeCounter[UID_A])
}
}
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