Code fixer does not convert [FixtureLifeCycle] attribute

[thomhurst]

Description

The NUnit migration code fixer (TUNU0001) does not convert NUnit's [FixtureLifeCycle] attribute to TUnit's equivalent, leaving the unconverted attribute in the code which causes compilation errors.

Reproduction Steps

1. Create a file with NUnit FixtureLifeCycle attribute:

using NUnit.Framework;

[FixtureLifeCycle(LifeCycle.InstancePerTestCase)]
public class TestClass
{
    private int _counter = 0;

    [Test]
    public void Test1()
    {
        _counter++;
        Assert.That(_counter, Is.EqualTo(1));
    }

    [Test]
    public void Test2()
    {
        _counter++;
        Assert.That(_counter, Is.EqualTo(1));
    }
}

2. Run the code fixer: dotnet format analyzers --severity info --diagnostics TUNU0001

3. The attribute remains unconverted:

using System.Threading.Tasks;

[FixtureLifeCycle(LifeCycle.InstancePerTestCase)]
public class TestClass
{
    private int _counter = 0;

    [Test]
    public async Task Test1()
    {
        _counter++;
        await Assert.That(_counter).IsEqualTo(1);
    }

    [Test]
    public async Task Test2()
    {
        _counter++;
        await Assert.That(_counter).IsEqualTo(1);
    }
}

4. Building produces errors:

error CS0246: The type or namespace name 'FixtureLifeCycle' could not be found
error CS0103: The name 'LifeCycle' does not exist in the current context

Expected Behavior

The code fixer should either:

1. Convert [FixtureLifeCycle(LifeCycle.InstancePerTestCase)] to TUnit's equivalent (if one exists)
2. Remove the attribute if TUnit's default behavior matches InstancePerTestCase
3. Leave a TODO comment indicating manual migration is required

Environment

• TUnit Version: 1.11.64
• .NET SDK: 10.0.100-preview.1.25103.12
• OS: Windows 11

Additional Context

According to NUnit documentation, [FixtureLifeCycle(LifeCycle.InstancePerTestCase)] creates a new instance of the test fixture for each test method. This is useful for ensuring test isolation.

---

Note: Please add tests when fixing this issue to prevent regression.