ch is typically used to assert that callbacks have been
invoked.</p>

<pre><code>exports.testAsync = function(assert, beforeExit){
    var n = 0;
    setTimeout(function(){
        ++n;
        assert.ok(true);
    }, 200);
    setTimeout(function(){
        ++n;
        assert.ok(true);
    }, 200);
    beforeExit(function(){
        assert.equal(2, n, 'Ensure both timeouts are called');
    });
};
</code></pre>

<h2 id="Assert-Utilities">Assert Utilities</h2>

<h3 id="assert-isNull-val-msg-">assert.isNull