StackOverflow2013

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19195957
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2013-10-05T09:06:13.537
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2013-10-06T09:37:33.047
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2017-05-23T11:57:32.693
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19038102
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As other answers suggest, <code>null</code>ing out the storage array is not directly verifiable by the public API. It would be simplest to add a <code>protected</code> method to allow direct examination of storage. As an alternative, consider the reason for this feature: any references held in your array should be released when <code>clear</code> is called. You can test this using only the public API, <code>Reference</code>s and some assumptions about GC (<a href="https://stackoverflow.com/questions/6968141/is-there-a-way-to-force-weak-and-or-soft-referenced-objects-to-be-gcd-in-java">Is there a way to FORCE weak and/or soft referenced objects to be GC'd in Java?</a>). Place an object on the stack, retaining a <code>Reference</code>, and then <code>clear</code> it: <pre><code>ReferenceQueue queue = new ReferenceQueue(); PhantomReference ref = addObjectToStackAndCreateReference(arrayStack, queue); arrayStack.clear() </code></pre> with a separate utility method to keep that object off the Java stack, which could prevent collection: <pre><code>private static PhantomReference addObjectToStackAndCreateReference(ArrayStack arrayStack, ReferenceQueue queue) { Object o = new Object(); PhantomReference ref = new PhantomReference(o, queue); arrayStack.push(o); return ref; } </code></pre> Now, verify that there are no remaining references to the object, so the reference has been enqueued: <pre><code>System.gc(); assertSame(ref, queue.remove()); </code></pre> I'd recommend adding methods to make the testing simpler; however, that's one way you could test it without adding any test-only API.
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1. POJ-Unit Testing clear() method in an Array Stack
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