Skip to main content

All Hail TDD!

Posted by edburns on March 14, 2005 at 8:57 AM PST

Way back in October 2002, I had the enviable position of ramping up
the development effort for the Sun RI for JavaServer Faces. At that
time, Test Driven Development (TDD) was just starting to catch on, and I
used my position as team leader to mandate (HA!) that we would use TDD
on the project. I realized that for any mandate to succeed, it must be
easy to implement, so the team and I invested in building the
infrastructure iteratively growing our test codebase. I can't tell you
how many times that investment has paid off, but I'll tell you one time:
right now.

While implementing Adam Winer's proposal for fixing the href="">State
Saving Window Id problem, I came across a corner case not covered
explicitly in the proposal. Basically, the proposal re-allocated some
responsibilities and neglected to re-allocate this one corner case,
which happened to be caught in an href="">HTMLUnit test, written by
Craig, I think. Unfortunately, the net effect of this neglect was to
throw the webapp into an infinite loop. It was very easy to re-produce:
just visit the prefix mapped webapp and include only the servlet-mapping
with no trailing slash and no viewId. Thanks to the unit test, I
quickly found and fixed the problem, without introducing the bug into
the code.

Related Topics >>