Crie um arquivo XML e salve-o com a extensão .snippet.
<CodeSnippets
>="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
<CodeSnippet Format="1.0.0">
<Header>
<Title>NUnitTestSnippet</Title>
<Author>Ashutosh</Author>
<Description>Creates a NUnit Test Snippet</Description>
<Shortcut>nunit</Shortcut>
</Header>
<Snippet>
<References>
<Reference>
<Assembly>nunit.framework.dll;</Assembly>
</Reference>
</References>
<Code Language="CSharp">
<![CDATA[
[TestFixture]
public class DataValidationTest
{
[SetUp]
public void Initialise() { }
[TearDown]
public void CleanUp() { }
[Test]
[Category("")]
[Description("")]
public void TestCheck() {}
}
]]>
</Code>
</Snippet>
</CodeSnippet>
</CodeSnippets>