codex-lv3-may-2025

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Level 22: Practice, Key Takeaways, and Next Steps

Practice: Your Turn!

Now it’s your turn to add some tests! Try adding tests for these scenarios:

For the add function:

1. Test with two negative numbers - What happens when you add -1 and -2?
2. Test with very small decimal numbers - Try adding 0.001 and 0.002
3. Test with one number being zero - What about add(0, 10)?

For the toSnakeCase function:

1. Test with text that has no spaces - What happens with 'HELLOWORLD'?
2. Test with text that is only spaces - Try ' ' (three spaces)
3. Test with mixed case - What about 'HeLLo WoRLd'?

Challenge: Write each test, run it, and see if it passes. If it fails, think about why!

Key Takeaways

• Test edge cases: zero, empty strings, very large numbers
• Use toBeCloseTo() for decimal/fraction testing
• Test unusual inputs: special characters, multiple spaces, mixed case
• Think about real-world scenarios your function might encounter

Next Steps

• Try writing tests that you think might fail - this helps you understand your function’s behavior
• Test with undefined or null - what happens?
• Can you think of other edge cases we haven’t covered?

Resources

• Vitest Documentation - Official Vitest documentation and API reference
• Vitest API Reference - Complete API documentation for all Vitest functions

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