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POBad form for JUnit test to throw exception?
 

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    <p>I'm pretty new to JUnit, and I don't really know what best practices are for exceptions and exception handling.</p> <p>For example, let's say I'm writing tests for an IPAddress class. It has a constructor IPAddress(String addr) that will throw an InvalidIPAddressException if addr is null. As far as I can tell from googling around, the test for the null parameter will look like this.</p> <pre><code>@Test public void testNullParameter() { try { IPAddress addr = new IPAddress(null); assertTrue(addr.getOctets() == null); } catch(InvalidIPAddressException e) { return; } fail("InvalidIPAddressException not thrown."); } </code></pre> <p>In this case, try/catch makes sense because I know the exception is coming.</p> <p>But now if I want to write testValidIPAddress(), there's a couple of ways to do it:</p> <p>Way #1:</p> <pre><code>@Test public void testValidIPAddress() throws InvalidIPAddressException { IPAddress addr = new IPAddress("127.0.0.1"); byte[] octets = addr.getOctets(); assertTrue(octets[0] == 127); assertTrue(octets[1] == 0); assertTrue(octets[2] == 0); assertTrue(octets[3] == 1); } </code></pre> <p>Way #2:</p> <pre><code>@Test public void testValidIPAddress() { try { IPAddress addr = new IPAddress("127.0.0.1"); byte[] octets = addr.getOctets(); assertTrue(octets[0] == 127); assertTrue(octets[1] == 0); assertTrue(octets[2] == 0); assertTrue(octets[3] == 1); } catch (InvalidIPAddressException e) { fail("InvalidIPAddressException: " + e.getMessage()); } } </code></pre> <p>Is is standard practice to throw unexpected exceptions to JUnit or just deal with them yourself?</p> <p>Thanks for the help.</p>
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