Asserting that a value is within an interval

Hello, I would like to do something like:

int a = 3;
int b = 5;

Assert.That(a, Is.InRangeOf(2).From(b));

which means that b - 2 <= a <= b + 2.

I couldn't come up with anything but c# 3 expressions to do subtraction and
addition. If anyone's interested I can write a patch for this.

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