| /* |
| * Copyright (C) 2021 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 NetworkStatsUtilsTest { |
| @Test |
| fun testMultiplySafeByRational() { |
| // Verify basic cases that the method equals to a * b / c. |
| assertEquals(3 * 5 / 2, NetworkStatsUtils.multiplySafeByRational(3, 5, 2)) |
| |
| // Verify input with zeros. |
| assertEquals(0 * 7 / 3, NetworkStatsUtils.multiplySafeByRational(0, 7, 3)) |
| assertEquals(7 * 0 / 3, NetworkStatsUtils.multiplySafeByRational(7, 0, 3)) |
| assertEquals(0 * 0 / 1, NetworkStatsUtils.multiplySafeByRational(0, 0, 1)) |
| assertEquals(0, NetworkStatsUtils.multiplySafeByRational(0, Long.MAX_VALUE, Long.MAX_VALUE)) |
| assertEquals(0, NetworkStatsUtils.multiplySafeByRational(Long.MAX_VALUE, 0, Long.MAX_VALUE)) |
| assertFailsWith<ArithmeticException> { |
| NetworkStatsUtils.multiplySafeByRational(7, 3, 0) |
| } |
| assertFailsWith<ArithmeticException> { |
| NetworkStatsUtils.multiplySafeByRational(0, 0, 0) |
| } |
| |
| // Verify cases where a * b overflows. |
| assertEquals(101, NetworkStatsUtils.multiplySafeByRational( |
| 101, Long.MAX_VALUE, Long.MAX_VALUE)) |
| assertEquals(721, NetworkStatsUtils.multiplySafeByRational( |
| Long.MAX_VALUE, 721, Long.MAX_VALUE)) |
| assertEquals(Long.MAX_VALUE, NetworkStatsUtils.multiplySafeByRational( |
| Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE)) |
| assertFailsWith<ArithmeticException> { |
| NetworkStatsUtils.multiplySafeByRational(Long.MAX_VALUE, Long.MAX_VALUE, 0) |
| } |
| } |
| |
| @Test |
| fun testConstrain() { |
| assertFailsWith<IllegalArgumentException> { |
| NetworkStatsUtils.constrain(5, 6, 3) // low > high |
| } |
| assertEquals(3, NetworkStatsUtils.constrain(5, 1, 3)) |
| assertEquals(3, NetworkStatsUtils.constrain(3, 1, 3)) |
| assertEquals(2, NetworkStatsUtils.constrain(2, 1, 3)) |
| assertEquals(1, NetworkStatsUtils.constrain(1, 1, 3)) |
| assertEquals(1, NetworkStatsUtils.constrain(0, 1, 3)) |
| |
| assertEquals(11, NetworkStatsUtils.constrain(15, 11, 11)) |
| assertEquals(11, NetworkStatsUtils.constrain(11, 11, 11)) |
| assertEquals(11, NetworkStatsUtils.constrain(1, 11, 11)) |
| } |
| } |