testinit <font color="green">ok</font><br>
testaddpositive <font color="green">ok</font><br>
testaddnegative <font color="green">ok</font><br>
testremovepositive <font color="green">ok</font><br>
testremovenegative <font color="green">ok</font><br>
testclear <font color="green">ok</font><br>
<p>6 tests run<br>0 failures.<br>