Property Injection

TUnit makes it easy to initialise some properties on your test class instead of passing them into the constructor.

Your properties must be marked with the required keyword and then simply place a data attribute on it. The required keyword keeps your code clean and correct. If a property isn't passed in, you'll get a compiler warning, so you know something has gone wrong. It also gets rid of any pesky nullability warnings.

Supported attributes for properties are:

• Argument
• MethodDataSource
• ClassDataSource
• DataSourceGeneratorAttribute (though limited to the first item returned)

This can help simplify base classes with common behaviour and avoid having to write boilerplate constructors everywhere.

using TUnit.Core;

namespace MyTestProject;

public class PropertySetterTests
{
    [Arguments("1")]
    public required string Property1 { get; init; }
        
    [MethodDataSource(nameof(MethodData))]
    public required string Property2 { get; init; }
        
    [ClassDataSource<InnerModel>]
    public required InnerModel Property3 { get; init; }
    
    [ClassDataSource<InnerModel>(Shared = SharedType.Globally)]
    public required InnerModel Property4 { get; init; }
    
    [ClassDataSource<InnerModel>(Shared = SharedType.ForClass)]
    public required InnerModel Property5 { get; init; }
    
    [ClassDataSource<InnerModel>(Shared = SharedType.Keyed, Key = "Key")]
    public required InnerModel Property6 { get; init; }
        
    [DataSourceGeneratorTests.AutoFixtureGenerator<string>]
    public required string Property7 { get; init; }
    
    [Test]
    public void Test()
    {
        Console.WriteLine(Property7);
    }
}