Yes it's possible.
First, go to the Menu and choose Resharper => Live Templates. There switch to the File-Templates tab. Add a new template there.
Give the template a description like 'UnitTest'
Give it a default-name like 'Test.cs' and choose 'File name must be a valid identifier'
Change the availability to 'in C# project ...'
Copy and paste your template into the text-field. Then replace the class-name with a variable. Variables are surrounded by $-characters. The $END$ marks where the cursor is when your done. Like this:
using NUnit.Framework;
namespace SolutionName.Core
{
[TestFixture]
public class $ClassNameTests$
{
[Test]
public void test()
{
$END$
}
}
}
Right next to the text-field is a list of the variables (you might need to extend is, its sometimes really small). There the ClassNameTests-variable appears. Choose the macro 'Current file name without extension'. Now the template is done, so store it
Go to your solution, right-click there and choose Add -> New From Template -> More... . There select your template. Make sure that you check the 'Add to quicklist' option and confirm. Now you can enter the class-name for the test and Resharper creates the file for you.
After that the template will be under Add -> New From Template -> Your Template Name
You can probably improve my solution with additional variables & macros. Play with it. Add variables to your template by surrounding a name with $-chars. Then choose a macro for the variable on the list next the the template-text.