Track 13 · Lesson 5 of 12

Thinking in edge cases

Find the inputs that break code: boundaries, empty and single values, zero and negatives, messy text, unicode and very large values.

You will be able to

• List the standard edge cases to consider for numbers, collections and text
• Split inputs into equivalence classes and test one value from each
• Test boundaries at, just below and just above each limit
• Fix code so it handles empty, oversized and invalid inputs deliberately