Slides from today's webinar on easily adding tests using CLion. More info: https://claremacrae.co.uk/blog/2021/02/clion-webinar-code-and-slides

1. Testing Superpowers:
Using CLion to
Add Tests Easily
Clare Macrae, 16 February 2021
@ClareMacraeUK
clare@claremacrae.co.uk

2. Topics
Testing with Catch2
Testing with Approval Tests
Using Code Coverage
Improving the tests
CLion testing tips (if time)
2

3. Introduction
3

4. Previously, on JetBrains Webinars…
“Before we start refactoring,
we want to add tests”
“The tests are green, so we
can start refactoring”
“What if we don’t have
tests?”
“It’s a pre-requisite for
any refactoring”
4

5. What if we don’t
have tests?

6. Goals
Add tests for untested
code, quickly and safely
01
Show the power of
Approval Tests to get
good coverage quickly
& explore the code
02
Use Code Coverage
tools in CLion to guide
your testing
03
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7. Let’s look at the code
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8. Catch2 string test
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9. What happened?
Testing multi-line strings in code is hard!
Listen to the PAIN!
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10. First Approval Test
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11. Approval Tests allow you to
verify a chunk of output (such
as a file) in one operation as
opposed to writing test
assertions for each element
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12. Approval Tests overview
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The Power of Approval Tests:
Simple to use
File naming and
creation
See failures
Updating
expected output
It just works!
Roll your own?

13. Objects,
Images,
Sound?
13

14. Dates,
Times,
GUIDs?
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15.  “I have some
problems with
the line endings”
15

16. Scrubber Namer Writer Comparator
Pass
Fail Reporter
Customisation Points
16

17. github.com/approvals/ApprovalTests.cpp
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18. Any
Questions?
18

19. Code Coverage
19

20. CLion
 Auto-creates configuration – Amazing!
20

21. 21

22. 22

23. C/C++ Coverage Plugin
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24. What next (for me?)
 (Learn to) Set up plugin on my Windows VM
 Add this to Jay Bazuzi’s ‘machine-setup’ repo
 Contribute to Plugin docs
24

25. Any
Questions?
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26. ❌ Production Data
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27. Formatting and readability
 Fake it ‘til you make it!
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28. CLion Testing Tips
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29. What tests to run?
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30. Know the Test Runner Tab
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31. Tidy Run/Debug Configurations
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32. Know your Icons
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33. Conclusions
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34. Thanks!
JetBrains for
CLion!
Markus Böck
C/C++ Coverage Plugin
34

35. Tactics
35
ASSUME TESTS ARE
POSSIBLE
LISTEN TO THE PAIN COVERAGE IS TO HELP
YOU

36. Any
Questions?
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