* Check out the code from svn or git
* Import the project into Eclipse or your favorite IDE
* Write a unit test:
+ * Binary formats and Common APIs: src/testcases/org/apache/poi/
+ * OOXML APIs only: src/ooxml/testcases/org/apache/poi/
+ * Scratchpad (Binary formats): src/scratchpad/testcases/org/apache/poi/
+ * test files: test-data/
* Navigate the source, make changes, and run unit tests to verify
* Binary formats and Common APIs: src/java/org/apache/poi/
* OOXML APIs only: src/ooxml/java/org/apache/poi/