[Bug]: xUnit TheoryData<T, U> doesn't translate into compilable code

[Cheesebaron]

Description

While using TUnitMigrator I encountered an issue when using TheoryData<T1, T2> with multiple types it translates into an IEnumerable<T1, T2> and leads to code that cannot compile.

Given you have a xUnit Theory with TheoryData like so:

[Theory]
[MemberData(nameof(MyData))]
public void MyTest(string a, int b)
{
}

and the data defined as:

public static TheoryData<string, int> MyData
{
 get
 {
 var data = new TheoryData<string, int>
 {
 {
 "a",
 1
 },
 {
 "b",
 2
 }
 };
 return data;
 }
}

Then when the TheoryData gets transformed into a MethodDataSource it seems to create an IEnumerable<string, int>, but the data variable is transformed into an array with only the first type like:

public static IEnumerable<string, int> MyData
{
 get
 {
 var data = string[]
 {
 {
 "a",
 1
 },
 {
 "b",
 2
 }
 }
 }
}

This doesn't compile at all.

Expected Behavior

I would have expected the analyzer to generate something like follows or similar that would compile and work with data driven test cases:

public static IEnumerable<Func<(string, int)>> MyData
{
 get
 {
 yield return () => ("a", 1);
 yield return () => ("b", 2);
 }
}

Actual Behavior

Code not compiling

Steps to Reproduce

1. Clone: https://github.com/Cheesebaron/tunitmigrator-xunittheorydata-repro
2. dotnet tool install --global TUnitMigrator
3. tunit-migrate /path/to/tunitmigrator-xunittheorydata-repro

TUnit Version

1.16.4

.NET Version

.NET 10

Operating System

macOS

IDE / Test Runner

dotnet CLI (dotnet test / dotnet run)

Error Output / Stack Trace

Additional Context

No response

IDE-Specific Issue?

• I've confirmed this issue occurs when running via dotnet test or dotnet run, not just in my IDE