Restore SEBPatch

SafeExamBrowser.Client.UnitTests/CoordinatorTests.cs

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+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace SafeExamBrowser.Client.UnitTests
+{
+	[TestClass]
+	public class CoordinatorTests
+	{
+		private Coordinator sut;
+
+		[TestInitialize]
+		public void Initialize()
+		{
+			sut = new Coordinator();
+		}
+
+		[TestMethod]
+		public void ReconfigurationLock_MustWorkCorrectly()
+		{
+			Assert.IsFalse(sut.IsReconfigurationLocked());
+
+			sut.RequestReconfigurationLock();
+
+			var result = Parallel.For(1, 1000, (_) =>
+			{
+				Assert.IsTrue(sut.IsReconfigurationLocked());
+				Assert.IsFalse(sut.RequestReconfigurationLock());
+			});
+
+			Assert.IsTrue(result.IsCompleted);
+
+			result = Parallel.For(1, 1000, (_) =>
+			{
+				sut.ReleaseReconfigurationLock();
+			});
+
+			Assert.IsFalse(sut.IsReconfigurationLocked());
+			Assert.IsTrue(result.IsCompleted);
+		}
+
+		[TestMethod]
+		public void RequestReconfigurationLock_MustOnlyAllowLockingOnce()
+		{
+			var count = 0;
+
+			Assert.IsFalse(sut.IsReconfigurationLocked());
+
+			var result = Parallel.For(1, 1000, (_) =>
+			{
+				var acquired = sut.RequestReconfigurationLock();
+
+				if (acquired)
+				{
+					Interlocked.Increment(ref count);
+				}
+			});
+
+			Assert.AreEqual(1, count);
+			Assert.IsTrue(sut.IsReconfigurationLocked());
+			Assert.IsTrue(result.IsCompleted);
+		}
+
+		[TestMethod]
+		public void RequestSessionLock_MustOnlyAllowLockingOnce()
+		{
+			var count = 0;
+
+			Assert.IsFalse(sut.IsSessionLocked());
+
+			var result = Parallel.For(1, 1000, (_) =>
+			{
+				var acquired = sut.RequestSessionLock();
+
+				if (acquired)
+				{
+					Interlocked.Increment(ref count);
+				}
+			});
+
+			Assert.AreEqual(1, count);
+			Assert.IsTrue(sut.IsSessionLocked());
+			Assert.IsTrue(result.IsCompleted);
+		}
+
+		[TestMethod]
+		public void SessionLock_MustWorkCorrectly()
+		{
+			Assert.IsFalse(sut.IsSessionLocked());
+
+			sut.RequestSessionLock();
+
+			var result = Parallel.For(1, 1000, (_) =>
+			{
+				Assert.IsTrue(sut.IsSessionLocked());
+				Assert.IsFalse(sut.RequestSessionLock());
+			});
+
+			Assert.IsTrue(result.IsCompleted);
+
+			result = Parallel.For(1, 1000, (_) =>
+			{
+				sut.ReleaseSessionLock();
+			});
+
+			Assert.IsFalse(sut.IsSessionLocked());
+			Assert.IsTrue(result.IsCompleted);
+		}
+	}
+}