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[TestFixture]
public class TestFixture
{
  [SetUp]
  public new void Setup()
  {
    base.Setup();

    Fixture.Customize<SystemUnderTest>(x => x.Without(system => system.Property));
  }

  [Test, AutoData]
  public void WhateverTestName(SystemUnderTest sut)
  {
    //Arrange
    //Act
    //Assert
    Assert.Throws<ArgumentNullException>(() => sut.MethodThatThrowsException());
  }
}

public class SystemUnderTest
{
  public void MethodThatThrowsException()
  {
    throws new ArgumentNullException();
  }

  public string Property {get; set;}
}

[NUnitAddin]
public class ClassWithAddin : Ploeh.AutoFixture.NUnit2.Addins.Addin
{
  protected IFixture Fixture;

  protected void Setup()
  {
    Fixture = new Fixture();
  }
}