Moved all unit test files into a separate directory in preparation for splitting the project

Tests/IntegerHelperTest.cs

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+#region Apache License 2.0
+/*
+Nuclex .NET Framework
+Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
+
+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.
+*/
+#endregion // Apache License 2.0
+
+#if UNITTEST
+
+using System;
+using System.Collections.Generic;
+
+using NUnit.Framework;
+
+namespace Nuclex.Support {
+
+  /// <summary>Contains unit tests for the integer helper class</summary>
+  [TestFixture]
+  internal class IntegerHelperTest {
+
+    /// <summary>
+    ///   Verifies that the next power of 2 calculation works for long integers
+    /// </summary>
+    [Test]
+    public void TestNextPowerOf2ULong() {
+      Assert.AreEqual(1UL, IntegerHelper.NextPowerOf2(0UL));
+      Assert.AreEqual(1UL, IntegerHelper.NextPowerOf2(1UL));
+      Assert.AreEqual(2UL, IntegerHelper.NextPowerOf2(2UL));
+      Assert.AreEqual(4UL, IntegerHelper.NextPowerOf2(3UL));
+      Assert.AreEqual(4UL, IntegerHelper.NextPowerOf2(4UL));
+      Assert.AreEqual(
+        9223372036854775808UL, IntegerHelper.NextPowerOf2(4611686018427387905UL)
+      );
+      Assert.AreEqual(
+        9223372036854775808UL, IntegerHelper.NextPowerOf2(9223372036854775807UL)
+      );
+      Assert.AreEqual(
+        9223372036854775808UL, IntegerHelper.NextPowerOf2(9223372036854775808UL)
+      );
+    }
+
+    /// <summary>
+    ///   Verifies that the next power of 2 calculation works for long integers
+    /// </summary>
+    [Test]
+    public void TestNextPowerOf2Long() {
+      Assert.AreEqual(1L, IntegerHelper.NextPowerOf2(0L));
+      Assert.AreEqual(1L, IntegerHelper.NextPowerOf2(1L));
+      Assert.AreEqual(2L, IntegerHelper.NextPowerOf2(2L));
+      Assert.AreEqual(4L, IntegerHelper.NextPowerOf2(3L));
+      Assert.AreEqual(4L, IntegerHelper.NextPowerOf2(4L));
+      Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(2305843009213693953L));
+      Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(4611686018427387903L));
+      Assert.AreEqual(4611686018427387904L, IntegerHelper.NextPowerOf2(4611686018427387904L));
+    }
+
+    /// <summary>
+    ///   Verifies that the next power of 2 calculation works for integers
+    /// </summary>
+    [Test]
+    public void TestNextPowerOf2UInt() {
+      Assert.AreEqual(1U, IntegerHelper.NextPowerOf2(0U));
+      Assert.AreEqual(1U, IntegerHelper.NextPowerOf2(1U));
+      Assert.AreEqual(2U, IntegerHelper.NextPowerOf2(2U));
+      Assert.AreEqual(4U, IntegerHelper.NextPowerOf2(3U));
+      Assert.AreEqual(4U, IntegerHelper.NextPowerOf2(4U));
+      Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(1073741825U));
+      Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(2147483647U));
+      Assert.AreEqual(2147483648U, IntegerHelper.NextPowerOf2(2147483648U));
+    }
+
+    /// <summary>
+    ///   Verifies that the next power of 2 calculation works for integers
+    /// </summary>
+    [Test]
+    public void TestNextPowerOf2Int() {
+      Assert.AreEqual(1, IntegerHelper.NextPowerOf2(0));
+      Assert.AreEqual(1, IntegerHelper.NextPowerOf2(1));
+      Assert.AreEqual(2, IntegerHelper.NextPowerOf2(2));
+      Assert.AreEqual(4, IntegerHelper.NextPowerOf2(3));
+      Assert.AreEqual(4, IntegerHelper.NextPowerOf2(4));
+      Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(536870913));
+      Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(1073741823));
+      Assert.AreEqual(1073741824, IntegerHelper.NextPowerOf2(1073741824));
+    }
+
+    /// <summary>Verifies that the bit counting method for integers works</summary>
+    [Test]
+    public void TestCountBitsInInteger() {
+      Assert.AreEqual(0, IntegerHelper.CountBits(0));
+      Assert.AreEqual(32, IntegerHelper.CountBits(-1));
+      Assert.AreEqual(16, IntegerHelper.CountBits(0x55555555));
+      Assert.AreEqual(16, IntegerHelper.CountBits(0xAAAAAAAA));
+
+      for (int bitIndex = 0; bitIndex < 32; ++bitIndex) {
+        Assert.AreEqual(1, IntegerHelper.CountBits(1 << bitIndex));
+      }
+    }
+
+    /// <summary>Verifies that the bit counting method for long integers works</summary>
+    [Test]
+    public void TestCountBitsInLongInteger() {
+      Assert.AreEqual(0, IntegerHelper.CountBits(0L));
+      Assert.AreEqual(64, IntegerHelper.CountBits(-1L));
+      Assert.AreEqual(32, IntegerHelper.CountBits(0x5555555555555555));
+      Assert.AreEqual(32, IntegerHelper.CountBits(0xAAAAAAAAAAAAAAAA));
+
+      for (int bitIndex = 0; bitIndex < 64; ++bitIndex) {
+        Assert.AreEqual(1, IntegerHelper.CountBits(1 << bitIndex));
+      }
+    }
+
+  }
+
+} // namespace Nuclex.Support
+
+#endif // UNITTEST