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

Tests/Collections/PriorityItemPairTest.cs

@@ -0,0 +1,99 @@
+#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.Collections {
+
+  /// <summary>Unit Test for the Priority/Item pair class</summary>
+  [TestFixture]
+  internal class PriorityItemPairTest {
+
+    #region class ToStringNullReturner
+
+    /// <summary>Test class in which ToString() can return null</summary>
+    private class ToStringNullReturner {
+
+      /// <summary>
+      ///   Returns a System.String that represents the current System.Object
+      /// </summary>
+      /// <returns>A System.String that represents the current System.Object</returns>
+      public override string ToString() { return null; }
+
+    }
+
+    #endregion // class ToStringNullReturner
+
+    /// <summary>Tests whether the pair's default constructor works</summary>
+    [Test]
+    public void TestDefaultConstructor() {
+      new PriorityItemPair<int, string>();
+    }
+
+    /// <summary>Tests whether the priority can be retrieved from the pair</summary>
+    [Test]
+    public void TestPriorityRetrieval() {
+      PriorityItemPair<int, string> testPair = new PriorityItemPair<int, string>(
+        12345, "hello world"
+      );
+
+      Assert.AreEqual(12345, testPair.Priority);
+    }
+
+    /// <summary>Tests whether the item can be retrieved from the pair</summary>
+    [Test]
+    public void TestItemRetrieval() {
+      PriorityItemPair<int, string> testPair = new PriorityItemPair<int, string>(
+        12345, "hello world"
+      );
+
+      Assert.AreEqual("hello world", testPair.Item);
+    }
+
+    /// <summary>Tests whether the ToString() methods works with valid strings</summary>
+    [Test]
+    public void TestToStringWithValidStrings() {
+      PriorityItemPair<string, string> testPair = new PriorityItemPair<string, string>(
+        "hello", "world"
+      );
+
+      Assert.AreEqual("[hello, world]", testPair.ToString());
+    }
+
+    /// <summary>Tests whether the ToString() methods works with null strings</summary>
+    [Test]
+    public void TestToStringWithNullStrings() {
+      PriorityItemPair<ToStringNullReturner, ToStringNullReturner> testPair =
+        new PriorityItemPair<ToStringNullReturner, ToStringNullReturner>(
+          new ToStringNullReturner(), new ToStringNullReturner()
+        );
+
+      Assert.AreEqual("[, ]", testPair.ToString());
+    }
+
+  }
+
+} // namespace Nuclex.Support.Collections
+
+#endif // UNITTEST