Check if instance is a collection of given type

Let's say I have this dummy code:

var object1 = new Test();

So, if I need check if object1 is an instance of Test class I can do:

var type = typeof(Test);
Console.WriteLine(object1.GetType() == type); // will print true

But now I have this object2 (A list of Test objects):

var object2 = new List<Test>
{
    new Test(),
    new Test(),
    new Test()
};

My question is: How can I check if object2 is a list of Test instances?