Converting your pretty good old test cases from Nunit to VS test cases is not as simple as posted in many blogs.
I tried to convert my test cases its really pain guys..
Its not jut renaming the name spaces and setting the alias. The Assert class itself is different. Microsoft Assert class is directly opposite to the Nunit assert classes.
For namespace and alias changes the following code is enough.
using Microsoft.VisualStudio.TestTools.UnitTesting;
using TestFixture = Microsoft.VisualStudio.TestTools.UnitTesting.TestClassAttribute;
using Test = Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute;
using SetUp = Microsoft.VisualStudio.TestTools.UnitTesting.TestInitializeAttribute;
using TearDown = Microsoft.VisualStudio.TestTools.UnitTesting.TestCleanupAttribute ;
using TestFixtureSetUp = Microsoft.VisualStudio.TestTools.UnitTesting.ClassInitializeAttribute;
using TestFixtureTearDown = Microsoft.VisualStudio.TestTools.UnitTesting.ClassCleanupAttribute;