assertEquals( 0, h.suggested() ); // avg(0, 0, 0, 0, 0) == 0
h.tickle();
assertEquals( 2, h.suggested() ); // avg(10, 0, 0, 0, 0) == 2
h.tickle();
assertEquals( 4, h.suggested() ); // avg(10, 10, 0, 0, 0) == 4
h.tickle();
assertEquals( 6, h.suggested() ); // avg(10, 10, 10, 0, 0) == 6
h.tickle();
assertEquals( 8, h.suggested() ); // avg(10, 10, 10, 10, 0) == 8
h.tickle();