Write the test cases first. [Test Cases]
Standardize your tests with Test::Simple or Test::More. [Modular Testing]
Standardize your test suites with Test::Harness. [Test Suites]
Write test cases that fail. [Failure]
Test both the likely and the unlikely. [What to Test]
Add new test cases before you start debugging. [Debugging and Testing]
Always use strict. [Strictures]
Always turn on warnings explicitly. [Warnings]
Never assume that a warning-free compilation implies correctness. [Correctness]
Turn off strictures or warnings explicitly, selectively, and in the smallest possible scope. [Overriding Strictures]
Learn at least a subset of the perl debugger. [The Debugger]
Use serialized warnings when debugging "manually". [Manual Debugging]
Consider using "smart comments" when debugging, rather than warn statements. [Semi-Automatic Debugging]
