130 lines
4.9 KiB
C#
130 lines
4.9 KiB
C#
#region Apache License 2.0
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/*
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Nuclex .NET Framework
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Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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#if UNITTEST
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using System;
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using System.Collections.Generic;
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using NUnit.Framework;
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namespace Nuclex.Support {
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/// <summary>Contains unit tests for the integer helper class</summary>
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[TestFixture]
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internal class IntegerHelperTest {
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/// <summary>
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/// Verifies that the next power of 2 calculation works for long integers
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/// </summary>
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[Test]
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public void TestNextPowerOf2ULong() {
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Assert.AreEqual(1UL, IntegerHelper.NextPowerOf2(0UL));
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Assert.AreEqual(1UL, IntegerHelper.NextPowerOf2(1UL));
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Assert.AreEqual(2UL, IntegerHelper.NextPowerOf2(2UL));
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Assert.AreEqual(4UL, IntegerHelper.NextPowerOf2(3UL));
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Assert.AreEqual(4UL, IntegerHelper.NextPowerOf2(4UL));
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Assert.AreEqual(
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9223372036854775808UL, IntegerHelper.NextPowerOf2(4611686018427387905UL)
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);
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Assert.AreEqual(
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9223372036854775808UL, IntegerHelper.NextPowerOf2(9223372036854775807UL)
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);
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Assert.AreEqual(
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9223372036854775808UL, IntegerHelper.NextPowerOf2(9223372036854775808UL)
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);
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}
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/// <summary>
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/// Verifies that the next power of 2 calculation works for long integers
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/// </summary>
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[Test]
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public void TestNextPowerOf2Long() {
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Assert.AreEqual(1L, IntegerHelper.NextPowerOf2(0L));
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Assert.AreEqual(1L, IntegerHelper.NextPowerOf2(1L));
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Assert.AreEqual(2L, IntegerHelper.NextPowerOf2(2L));
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Assert.AreEqual(4L, IntegerHelper.NextPowerOf2(3L));
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Assert.AreEqual(4L, IntegerHelper.NextPowerOf2(4L));
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Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(2305843009213693953L));
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Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(4611686018427387903L));
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Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(4611686018427387904L));
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}
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/// <summary>
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/// Verifies that the next power of 2 calculation works for integers
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/// </summary>
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[Test]
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public void TestNextPowerOf2UInt() {
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Assert.AreEqual(1U, IntegerHelper.NextPowerOf2(0U));
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Assert.AreEqual(1U, IntegerHelper.NextPowerOf2(1U));
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Assert.AreEqual(2U, IntegerHelper.NextPowerOf2(2U));
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Assert.AreEqual(4U, IntegerHelper.NextPowerOf2(3U));
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Assert.AreEqual(4U, IntegerHelper.NextPowerOf2(4U));
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Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(1073741825U));
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Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(2147483647U));
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Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(2147483648U));
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}
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/// <summary>
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/// Verifies that the next power of 2 calculation works for integers
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/// </summary>
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[Test]
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public void TestNextPowerOf2Int() {
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Assert.AreEqual(1, IntegerHelper.NextPowerOf2(0));
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Assert.AreEqual(1, IntegerHelper.NextPowerOf2(1));
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Assert.AreEqual(2, IntegerHelper.NextPowerOf2(2));
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Assert.AreEqual(4, IntegerHelper.NextPowerOf2(3));
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Assert.AreEqual(4, IntegerHelper.NextPowerOf2(4));
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Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(536870913));
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Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(1073741823));
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Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(1073741824));
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}
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/// <summary>Verifies that the bit counting method for integers works</summary>
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[Test]
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public void TestCountBitsInInteger() {
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Assert.AreEqual(0, IntegerHelper.CountBits(0));
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Assert.AreEqual(32, IntegerHelper.CountBits(-1));
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Assert.AreEqual(16, IntegerHelper.CountBits(0x55555555));
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Assert.AreEqual(16, IntegerHelper.CountBits(0xAAAAAAAA));
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for (int bitIndex = 0; bitIndex < 32; ++bitIndex) {
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Assert.AreEqual(1, IntegerHelper.CountBits(1 << bitIndex));
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}
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}
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/// <summary>Verifies that the bit counting method for long integers works</summary>
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[Test]
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public void TestCountBitsInLongInteger() {
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Assert.AreEqual(0, IntegerHelper.CountBits(0L));
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Assert.AreEqual(64, IntegerHelper.CountBits(-1L));
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Assert.AreEqual(32, IntegerHelper.CountBits(0x5555555555555555));
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Assert.AreEqual(32, IntegerHelper.CountBits(0xAAAAAAAAAAAAAAAA));
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for (int bitIndex = 0; bitIndex < 64; ++bitIndex) {
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Assert.AreEqual(1, IntegerHelper.CountBits(1 << bitIndex));
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}
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}
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}
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} // namespace Nuclex.Support
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#endif // UNITTEST
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