Restore SEBPatch

SafeExamBrowser.Core.UnitTests/Operations/LazyInitializationOperationTests.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;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using SafeExamBrowser.Core.Contracts.OperationModel;
+using SafeExamBrowser.Core.Contracts.OperationModel.Events;
+using SafeExamBrowser.Core.Operations;
+using SafeExamBrowser.I18n.Contracts;
+
+namespace SafeExamBrowser.Core.UnitTests.Operations
+{
+	[TestClass]
+	public class LazyInitializationOperationTests
+	{
+		private Mock<IOperation> operationMock;
+
+		[TestInitialize]
+		public void Initialize()
+		{
+			operationMock = new Mock<IOperation>();
+		}
+
+		[TestMethod]
+		public void MustInstantiateOperationOnPerform()
+		{
+			var initialized = false;
+			IOperation initialize()
+			{
+				initialized = true;
+
+				return operationMock.Object;
+			};
+
+			var sut = new LazyInitializationOperation(initialize);
+
+			sut.Perform();
+
+			Assert.IsTrue(initialized);
+		}
+
+		[TestMethod]
+		[ExpectedException(typeof(NullReferenceException))]
+		public void MustNotInstantiateOperationOnRevert()
+		{
+			IOperation initialize()
+			{
+				return operationMock.Object;
+			};
+
+			var sut = new LazyInitializationOperation(initialize);
+
+			sut.Revert();
+		}
+
+		[TestMethod]
+		public void MustReturnCorrectOperationResult()
+		{
+			IOperation initialize()
+			{
+				return operationMock.Object;
+			};
+
+			operationMock.Setup(o => o.Perform()).Returns(OperationResult.Success);
+			operationMock.Setup(o => o.Revert()).Returns(OperationResult.Failed);
+
+			var sut = new LazyInitializationOperation(initialize);
+			var perform = sut.Perform();
+			var revert = sut.Revert();
+
+			Assert.AreEqual(OperationResult.Success, perform);
+			Assert.AreEqual(OperationResult.Failed, revert);
+		}
+
+		[TestMethod]
+		public void MustCorrectlyHandleEventSubscription()
+		{
+			IOperation initialize()
+			{
+				return operationMock.Object;
+			};
+
+			var actionRequired = 0;
+			var actionRequiredHandler = new ActionRequiredEventHandler(args => actionRequired++);
+			var statusChanged = 0;
+			var statusChangedHandler = new StatusChangedEventHandler(t => statusChanged++);
+			var sut = new LazyInitializationOperation(initialize);
+
+			sut.ActionRequired += actionRequiredHandler;
+			sut.StatusChanged += statusChangedHandler;
+
+			sut.Perform();
+
+			operationMock.Raise(o => o.ActionRequired += null, new Mock<ActionRequiredEventArgs>().Object);
+			operationMock.Raise(o => o.StatusChanged += null, default(TextKey));
+
+			Assert.AreEqual(1, actionRequired);
+			Assert.AreEqual(1, statusChanged);
+
+			sut.ActionRequired -= actionRequiredHandler;
+			sut.StatusChanged -= statusChangedHandler;
+
+			operationMock.Raise(o => o.ActionRequired += null, new Mock<ActionRequiredEventArgs>().Object);
+			operationMock.Raise(o => o.StatusChanged += null, default(TextKey));
+
+			Assert.AreEqual(1, actionRequired);
+			Assert.AreEqual(1, statusChanged);
+
+			sut.ActionRequired += actionRequiredHandler;
+			sut.StatusChanged += statusChangedHandler;
+
+			operationMock.Raise(o => o.ActionRequired += null, new Mock<ActionRequiredEventArgs>().Object);
+			operationMock.Raise(o => o.StatusChanged += null, default(TextKey));
+
+			Assert.AreEqual(2, actionRequired);
+			Assert.AreEqual(2, statusChanged);
+		}
+
+		[TestMethod]
+		public void MustUseSameInstanceForAllOperations()
+		{
+			var first = true;
+			var operation = operationMock.Object;
+			IOperation initialize()
+			{
+				if (first)
+				{
+					first = false;
+
+					return operation;
+				}
+
+				return new Mock<IOperation>().Object;
+			};
+
+			var sut = new LazyInitializationOperation(initialize);
+
+			sut.Perform();
+			sut.Revert();
+
+			operationMock.Verify(o => o.Perform(), Times.Once);
+			operationMock.Verify(o => o.Revert(), Times.Once);
+		}
+
+		[TestMethod]
+		public void MustNotFailOnEventRegistrationWithoutOperation()
+		{
+			var sut = new LazyInitializationOperation(() => default);
+
+			sut.ActionRequired += default;
+			sut.StatusChanged += default;
+
+			sut.ActionRequired -= default;
+			sut.StatusChanged -= default;
+		}
+	}
+}