Added test for using engine.

src/ClearScript.Manager.Test/ClearScript.Manager.Test.csproj

@@ -51,6 +51,7 @@
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ScriptSubject.cs" />
+    <Compile Include="WhenUsingGetEngine.cs" />
     <Content Include="TestDiffNameRequire.js">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </Content>

src/ClearScript.Manager.Test/WhenUsingGetEngine.cs

@@ -0,0 +1,27 @@
+using NUnit.Framework;
+using Should;
+
+namespace ClearScript.Manager.Test
+{
+    [TestFixture]
+    public class WhenUsingEngine
+    {
+        [Test]
+        public void Script_Engine_Is_Retrieved()
+        {
+            ManagerPool.InitializeCurrentPool(new ManualManagerSettings { RuntimeMaxCount = 2 });
+
+            using (var scope = new ManagerScope())
+            {
+                var engine = scope.RuntimeManager.GetEngine();
+
+                engine.ShouldNotBeNull();
+
+                engine.Execute("var i = 200;");
+
+                Assert.AreEqual(200, engine.Script.i);
+            }
+
+        } 
+    }
+}

src/ClearScript.Manager/RuntimeManager.cs

@@ -99,6 +99,12 @@ public interface IRuntimeManager : IDisposable
         /// <returns>Bool indicating that cached script was located.</returns>
         bool TryGetCached(string scriptId, out CachedV8Script script);
 
+        /// <summary>
+        /// Retrieves the script engine for the current runtime manager.
+        /// </summary>
+        /// <returns></returns>
+        V8ScriptEngine GetEngine();
+
         /// <summary>
         /// Cleans up resources in the current runtime.
         /// </summary>