Added a multithreading unit tests

Author: Taritsyn

test/MsieJavaScriptEngine.Test.Auto/MultithreadingTests.cs

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+using NUnit.Framework;
+
+using MsieJavaScriptEngine.Test.Common;
+
+namespace MsieJavaScriptEngine.Test.Auto
+{
+	[TestFixture]
+	public class MultithreadingTests : MultithreadingTestsBase
+	{
+		protected override JsEngineMode EngineMode => JsEngineMode.Auto;
+	}
+}

test/MsieJavaScriptEngine.Test.ChakraActiveScript/MultithreadingTests.cs

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+using System;
+
+using NUnit.Framework;
+
+using MsieJavaScriptEngine.Test.Common;
+
+namespace MsieJavaScriptEngine.Test.ChakraActiveScript
+{
+	[TestFixture]
+	public class MultithreadingTests : MultithreadingTestsBase
+	{
+		protected override JsEngineMode EngineMode => JsEngineMode.ChakraActiveScript;
+	}
+}

test/MsieJavaScriptEngine.Test.ChakraEdgeJsRt/MultithreadingTests.cs

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+using System;
+using System.Text.RegularExpressions;
+
+using NUnit.Framework;
+
+using MsieJavaScriptEngine.Test.Common;
+
+namespace MsieJavaScriptEngine.Test.ChakraEdgeJsRt
+{
+	[TestFixture]
+	public class MultithreadingTests : MultithreadingTestsBase
+	{
+		protected override JsEngineMode EngineMode => JsEngineMode.ChakraEdgeJsRt;
+	}
+}

test/MsieJavaScriptEngine.Test.ChakraIeJsRt/MultithreadingTests.cs

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+using System;
+
+using NUnit.Framework;
+
+using MsieJavaScriptEngine.Test.Common;
+
+namespace MsieJavaScriptEngine.Test.ChakraIeJsRt
+{
+	[TestFixture]
+	public class MultithreadingTests : MultithreadingTestsBase
+	{
+		protected override JsEngineMode EngineMode => JsEngineMode.ChakraIeJsRt;
+	}
+}

test/MsieJavaScriptEngine.Test.Classic/MultithreadingTests.cs

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+using System;
+
+using NUnit.Framework;
+
+using MsieJavaScriptEngine.Test.Common;
+
+namespace MsieJavaScriptEngine.Test.Classic
+{
+	[TestFixture]
+	public class MultithreadingTests : MultithreadingTestsBase
+	{
+		protected override JsEngineMode EngineMode => JsEngineMode.Classic;
+	}
+}

test/MsieJavaScriptEngine.Test.Common/MultithreadingTestsBase.cs

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+using System.Threading;
+
+using NUnit.Framework;
+
+namespace MsieJavaScriptEngine.Test.Common
+{
+	[TestFixture]
+	public abstract class MultithreadingTestsBase : TestsBase
+	{
+		[Test]
+		public virtual void ExecutionOfCodeFromDifferentThreadsIsCorrect()
+		{
+			// Arrange
+			const string variableName = "foo";
+			string inputCode1 = string.Format("var {0} = 'bar';", variableName);
+			string inputCode2 = string.Format("{0} = 'baz';", variableName);
+			const string targetOutput = "baz";
+
+			// Act
+			string output;
+
+			using (var jsEngine = CreateJsEngine())
+			{
+				jsEngine.Execute(inputCode1);
+
+				var thread = new Thread(() => jsEngine.Execute(inputCode2));
+				thread.Start();
+				thread.Join();
+
+				output = jsEngine.GetVariableValue<string>(variableName);
+			}
+
+			// Assert
+			Assert.AreEqual(targetOutput, output);
+		}
+	}
+}