public void ForEach()
{
var mutables = new Mutable[] {
new Mutable {
value = 1
},
new Mutable {
value = 2
},
new Mutable {
value = 3
},
};
mutables.Select(m => m).ForEach(m => m.value += 1);
CollectionAssert.AreEqual(
new int[] { 2, 3, 4 },
mutables.Select(m => m.value)
);
}