5 28.3 26.87 73.93-1.15 101.96l-13.1 13.09a16.1 16.1 0 0 0-3.77 16.6c5.86 17.2 9.04 35 9.69 52.73.5 13.9 17.45 20.44 27.29 10.6l37.1-37.1c59.28-59.26 59.28-155.7 0-214.96z"/>
      </svg></a> </h2>
<section aria-labelledby="toc_test-helpers">
<p>One of the major issues in testing web applications is that all code is
event-driven and therefore has the potential to be asynchronous (i.e. output can
happen out of sequence from input). This has the ramification that code can be
executed in any order.</p>
<p>An e