Issue with sqldatabasesetup.cs file and namespace

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C#

VS2015

I'm getting an error saying " The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft'(are you missing an assembly reference?).

Below is the complete code in sqlDatabaseSetup.cs -

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.Common;
using Microsoft.Data.Tools.Schema.Sql.UnitTesting;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Shop
{
[TestClass()]
public class SqlDatabaseSetup
{

[AssemblyInitialize()]
public static void InitializeAssembly(TestContext ctx)
{
// Setup the test database based on setting in the
// configuration file
SqlDatabaseTestClass.TestService.DeployDatabaseProject();
SqlDatabaseTestClass.TestService.GenerateData();
}

}
}

Similar errors are appearing against "TestClass" & "AssemblyInitialize".

What I have tried:

What shall I do ? Is there any .dll file that needs to be installed?