rj := ri.Unlink(j)
			verify(t, rj, j, -1)
			verify(t, ri, i-j, -1)
			ri.Link(rj)
			verify(t, ri, i, -1)
		}
	}
}

// Test that calling Move() on an empty Ring initializes it.
func TestMoveEmptyRing(t *testing.T) {
	var r Ring

	r.Move(1)
	verify(t, &r, 1, 0)