Passing arguments to class constructor

[silkfire]

I'm new to TUnit, but after reading the documentation quite thoroughly, I couldn't really find a way to achieve this.

How do I pass custom per-test class arguments to the constructor of a class data source?

Either to [ClassConstructorAttribute<T>] or [ClassDataSource<T>].

E.g. I want to provide a special string tag to my class that is related to the test class.

[thomhurst]

You can't with the [ClassDataSource] attribute. But you can create your own attribute

public class MyGenerator<T>(string tag) : DataSourceGeneratorAttribute<T>

[silkfire]

Thanks for the quick reply and clear directions, I'll try that out.

[silkfire]

I realized that I wasn't clear enough in my original post. What I want is to instantiate a property in the test class that is a helper that needs to be used by all methods in the test class, but the helper needs an argument passed to its constructor as that will determine what is actually tested in the test class.

My current way of doing this is like this:

public class MyServiceTag1Tests : TestBase<MyService>
{
   public MyServiceTag1Tests () : base(MyService.Tag1) { }
}

Which gives the test class access to a protected property that is an instance of the helper class.

What I was wondering if it would be more idiomatic in TUnit to do it like this:

public class MyServiceTag1Tests
{
   [TestHelperGenerator<TestHelper>(MyService.Tag1)]
   public required TestHelper Helper { get; init; }
}

I'm trying to wrap my ahead around that the GenerateDataSources method needs to return an IEnumerable, but this is not a test method that needs a list of different inputs, but a property with just one value.

[silkfire]

I also saw an attribute called DataSourceForProperty in the documentation but it doesn't seem to exist in the TUnit assembly.

[thomhurst]

I'm trying to wrap my ahead around that the GenerateDataSources method needs to return an IEnumerable, but this is not a test method that needs a list of different inputs, but a property with just one value.

You just return a single item and the framework will work it out for you