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POHow to test passing of time in jUnit test without accessing private variables?
 

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  1. POHow to test passing of time in jUnit test without accessing private variables?
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    <p>I'm unit testing a class where I need a certain amount of time to pass before I can check results. Specifically I need x minutes to pass before I can tell whether the test worked or not. I have read that in unit testing we should be testing the interface and not the implementation, so we should not be accessing private variables, but other than putting a sleep in my unit test I don't know how to test without modifying private variables.</p> <p>My test is set up like this:</p> <pre><code>@Test public void testClearSession() { final int timeout = 1; final String sessionId = "test"; sessionMgr.setTimeout(timeout); try { sessionMgr.createSession(sessionId); } catch (Exception e) { e.printStackTrace(); } DBSession session = sessionMgr.getSession(sessionId); sessionMgr.clearSessions(); assertNotNull(sessionMgr.getSession(sessionId)); Calendar accessTime = Calendar.getInstance(); accessTime.add(Calendar.MINUTE, - timeout - 1); session.setAccessTime(accessTime.getTime()); // MODIFY PRIVATE VARIABLE VIA PROTECTED SETTER sessionMgr.clearSessions(); assertNull(sessionMgr.getSession(sessionId)); } </code></pre> <p>Is it possible to test this other than modifying the accessTime private variable (via creating the setAccessTime setter or reflection), or inserting a sleep in the unit test?</p> <p>EDIT 11-April-2012</p> <p>I am specifically trying to test that my SessionManager object clears sessions after a specific period of time has passed. The database I am connecting to will drop connections after a fixed period of time. When I get close to that timeout, the SessionManager object will clear the sessions by calling a "finalise session" procedure on the database, and removing the sessions from it's internal list.</p> <p>The SessionManager object is designed to be run in a separate thread. The code I am testing looks like this:</p> <pre><code>public synchronized void clearSessions() { log.debug("clearSessions()"); Calendar cal = Calendar.getInstance(); cal.add(Calendar.MINUTE, - timeout); Iterator&lt;Entry&lt;String, DBSession&gt;&gt; entries = sessionList.entrySet().iterator(); while (entries.hasNext()) { Entry&lt;String, DBSession&gt; entry = entries.next(); DBSession session = entry.getValue(); if (session.getAccessTime().before(cal.getTime())) { // close connection try { connMgr.closeconn(session.getConnection(), entry.getKey()); } catch (Exception e) { e.printStackTrace(); } entries.remove(); } } } </code></pre> <p>The call to connMgr (ConnectionManager object) is a bit convoluted, but I am in the process of refactoring legacy code and it is what it is at the moment. The Session object stores a connection to the database as well as some associated data.</p>
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    1. USItai Hanski
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    1. COA side note: unit tests generally shouldn't test anything that works in background (in separate threads). So you may splitting the logic and running it in another thread. The first one then could be easily tested by unit tests, and the second - by functional/acceptance tests
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      1. USzerkms
    2. CODoes the code that you're testing call `System.getCurrentTimeMillis()` (or something equivalent such as `new Date()`)? If so, this is something of a testability anti-pattern; you want to delegate this to a "time source" class, that you can inject. Then, you can do your tests with a mock time source. If you can post the source that you're trying to test, I can help you understand how to do what I suggest.
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      1. USDawood ibn Kareem
    3. CO@DavidWallace - I just assumed GetInstance is that call. JavaDocs confirm `Calendar's getInstance method returns a Calendar object whose time fields have been initialized with the current date and time:`
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