如何使用moq测试抽象类中的具体方法？

public abstract class AbstractClass
{
    public abstract int AbstractMethod();

    public virtual int ConcreteMethod()
    {
        return 10;
    }
}

public class ConcreteClass : AbstractClass
{
    public override int AbstractMethod()
    {
        return 20;
    }
}

[Test]
public void TestAbstractMethod()
{
    var mock = new Mock<ConcreteClass>();
    mock.Setup(m => m.AbstractMethod()).Returns(30);

    var result = mock.Object.AbstractMethod();

    Assert.AreEqual(30, result);
    mock.Verify(m => m.AbstractMethod(), Times.Once);
}

[Test]
public void TestConcreteMethod()
{
    var mock = new Mock<ConcreteClass>();
    mock.Setup(m => m.ConcreteMethod()).Returns(40);

    var result = mock.Object.ConcreteMethod();

    Assert.AreEqual(40, result);
    mock.Verify(m => m.ConcreteMethod(), Times.Once);
}