Solutions for Java developers
04/09/09
By Klaus P. Berg
When writing unit tests for a method (or a constructor) it's
important that you cover all boundary cases and possible inputs.
Some inputs will cause the method to throw an exception, and
you'll want to verify that output. There are two types of
exceptions:checkedandunchecked. Both are of interest when it
comes to properly unit testing a method.
Checked exceptions are for expected errors and should be dealt
with programmatically. Unchecked exceptions are mainly for
programming errors, and are derived from the
JDKRuntimeExceptionclass. Such exceptions should be allowed to
brachiate all the way up the class hierarchy and terminate the
test, because they usually indicate situations from which the
program is not meant to recover. However,
someRuntimeExceptionsubclasses,
likeIllegalArgumentExceptionorNullPointerException, may indicate
errors in method parameters handed over to the callee. Of
course, if such exceptions are part of the API contract, they
have to be checked with a unit test.
In the next sections I'll highlight some of the idiosyncrasies
of exception testing with JUnit 3.8.x, JUnit 4, and TestNG, and
also offer tips for resolving exceptions and failures in
callback methods, based on JUnit 4 ...
Read more: Checked and unchecked exceptions in JUnit and TestNG
http://www.networkworld.com/nljavaworldsente191096
1. Writing good unit tests, Part 1: Follow your GUTs
http://www.networkworld.com/nljavaworldsente187286
2. Groovy-power automated builds with Gant
http://www.javaworld.com/javaworld/jw-02-2008/jw-02-gant.html
3. Recipes to improve your Google Web Toolkit development
http://www.javaworld.com/javaworld/jw-04-2007/jw-04-gwt.html
More in JW Blogs: 5 movie quotes for software developers
http://www.javaworld.com/community/node/2752
By Dustin Marx
1. I've just sucked one year of your life away
2. The code is more what you'd call 'guidelines' than actual
rules
3. Takes a big man to admit when he's wrong. I am not a big man
4. It's not the years, honey, it's the mileage
5. I don't know, I'm making this up as I go
Find out where these quotes originated and get five more
http://www.javaworld.com/community/node/2752 1. Deadlock anti-patterns #2: Worker Aggregation
http://www.javaworld.com/community/node/2747
2. Deadlock anti-patterns #1: No Arbitration
http://www.javaworld.com/community/node/2701
3. 28 interview questions you wish you'd asked
http://www.javaworld.com/community/node/2745
4. Agile tactics: Refactoring on @Ignore
http://www.javaworld.com/community/node/2741
You've hit the tip of the iceberg: Read more in JW Blogs
http://www.javaworld.com/community/
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This newsletter is sponsored by Avaya
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In this live webcast, the CIO of one of the largest, U.S.-based
intellectual property law firms talks about his experiences
implementing a unified communications solution. He'll describe
the challenges and resulting benefits, and how his firm has
mastered UC.
http://adserver.fattail.com/redir/redirect.asp?CID=294836
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