October 2021
Intermediate to advanced
277 pages
5h 48m
English
Content preview from Learning Test-Driven Development
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Chapter 10. Error Handling
What error drives our eyes and ears amiss?
William Shakespeare (through the tongue of Antipholus of Syracuse), The Comedy of Errors
Mistakes are a part of life. One of the reasons for adopting test-driven development is to ensure that we can go as fast as we safely can, minimizing bugs in code.
The next item on our feature list is to improve error handling:
5 USD × 2 = 10 USD |
10 EUR × 2 = 20 EUR |
4002 KRW / 4 = 1000.5 KRW |
5 USD + 10 USD = 15 USD |
Separate test code from production code |
Remove redundant tests |
5 USD + 10 EUR = 17 USD |
1 USD + 1100 KRW = 2200 KRW# |
Determine exchange rate based on the currencies involved (from → to) |
Improve error handling when exchange rates are unspecified |
Allow exchange rates to be modified |
Error Wish List
The way our code currently handles missing exchange rates is buggy. Let’s address this shortcoming. Table 10-1 shows our wish list for handling errors due to missing exchange rates.
| Item | Description |
|---|---|
1 |
The |
2 |
The error message should be “greedy”—that is, it should indicate all the missing exchange rates that prevent a |
3 |
To prevent the error from being ignored by the caller, no valid |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.