Add Tests for NUnit3DriverFactory.

Author: manfred-brands

src/NUnitEngine/nunit.engine.core/Drivers/NUnit3DriverFactory.cs

@@ -9,7 +9,7 @@ namespace NUnit.Engine.Drivers
 {
     public class NUnit3DriverFactory : IDriverFactory
     {
-        private const string NUNIT_FRAMEWORK = "nunit.framework";
+        public const string NUNIT_FRAMEWORK = "nunit.framework";
 
         /// <summary>
         /// Gets a flag indicating whether a given assembly name and version

src/NUnitEngine/nunit.engine.tests/Drivers/NUnit3DriverFactoryTests.cs

@@ -0,0 +1,42 @@
+using NUnit.Engine.Drivers;
+using NUnit.Framework;
+using System;
+using System.Reflection;
+
+namespace NUnit.Engine.Tests.Drivers
+{
+    public class NUnit3DriverFactoryTests
+    {
+        private NUnit3DriverFactory _factory;
+
+        [SetUp]
+        public void SetUp()
+        {
+            _factory = new NUnit3DriverFactory();
+        }
+
+        [TestCase(2, ExpectedResult = false)]
+        [TestCase(3, ExpectedResult = true)]
+        [TestCase(4, ExpectedResult = true)]
+        public bool SupportsNetFramework(int majorVersion)
+        {
+            AssemblyName name = new AssemblyName(NUnit3DriverFactory.NUNIT_FRAMEWORK)
+            {
+                Version = new Version(majorVersion, 0)
+            };
+
+            return _factory.IsSupportedTestFramework(name);
+        }
+
+        [Test]
+        public void DoesNotSupportOtherFrameworks()
+        {
+            AssemblyName name = new AssemblyName("VSTest.dll")
+            {
+                Version = new Version(3, 0)
+            };
+
+            Assert.That(_factory.IsSupportedTestFramework(name), Is.False);
+        }
+    }
+}