5 unit testing facts I wish I know 7 years ago

•

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Getting started with unit tests should be simple – it’s just a matter of writing code to test other code. If that’s right why so many talented developers fail implementing unit tests in their daily job. I’ve started using unit tests 8 years ago and failed miserably. It took me 2 years and the right company to start over and learn how to properly use unit tests and TDD as development tools. In this talk I’ll cover the non-trivial facts I learnt about unit testing and the tips that I use to this day.

Software

OzCode (a.k.a “Magical debugging”) Evangelist
http://blog.drorhelper.com

code
code
code
Debug
Crash == 0 ‘it works!’

Write test
Is test passing?
Try and Fix
Test
Other tests
passing?
Download NUnit
Are we done
yet?
Coffee
[Test]
public void AddTest()
{
var cut = new MyClass();
var result = cut.Func(“abc”, 3);
Assert.AreEqual(5, result);
}

And Nobody cared 
Conclusion: stop writing tests

Success (and Failure) depends on
environment not only depends on
how you write tests
#1

Source Control
Build Server
Commit
There you go
What’s new?
BuildAgents

TheTeam
•The team commitment is important
•Everybody does it
•Learn from test reviews
•Track & publish results

Code
GO
Code
Code
Code
Code
Code
Code
Code
Code
Code
Code
Test

¯_(ツ)_/¯
Acceptance tests  requirements
Unit tests  Micro requirements
• technical detail you can explain to your peers
• May require some trail & error

$[Test] public async Task GetTextsWhenServerDownloadFail() { // Who am I??? var result = await _surveyService.GetTextsAsync(); Assert.IsFalse(result.HasError); Assert.NotNull(result.TheResult); }$

Unit testing is not about writing
tests
#5

× Test123
× CustomerTest
× PerchaseOrderTestNew
× MoveBatteryVanilla
 CalculateTax_InvalidYear_LogErrorToFile
 OrdersShouldBeCreated
 OrdersWithNoProductsShouldFail

"1234567890".Should().Be("0987654321");
Expected string to be "0987654321", but
"1234567890" differs near "123" (index 0).

Early feedback
Safety net
Refactoring
Design
Validate requirements
Change your code without fear

Thank you
drorh@codevalue.net http://blog.drorhelper.com

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5 unit testing facts I wish I know 7 years ago

1. 5 7 @dhelper

2. OzCode (a.k.a “Magical debugging”) Evangelist http://blog.drorhelper.com

4. code code code Debug Crash == 0 ‘it works!’

5. 100 little bugs in the code 

6. Write test Is test passing? Try and Fix Test Other tests passing? Download NUnit Are we done yet? Coffee [Test] public void AddTest() { var cut = new MyClass(); var result = cut.Func(“abc”, 3); Assert.AreEqual(5, result); }

7. And Nobody cared  Conclusion: stop writing tests

8. Success (and Failure) depends on environment not only depends on how you write tests #1

9. Build server Dev machines Team Project

10. Source Control Build Server Commit There you go What’s new? BuildAgents

11. TheTeam •The team commitment is important •Everybody does it •Learn from test reviews •Track & publish results

12.

13.

14. Code GO Code Code Code Code Code Code Code Code Code Code Test

15.

16. Class Unit #2

17. ¯_(ツ)_/¯ Acceptance tests  requirements Unit tests  Micro requirements • technical detail you can explain to your peers • May require some trail & error

18. Not all tests are unit tests #3

19.

20. Server Comm Client UITestFake Comm

21.

22.

23. [Test] public async Task GetTextsWhenServerDownloadFail() { // Who am I??? var result = await _surveyService.GetTextsAsync(); Assert.IsFalse(result.HasError); Assert.NotNull(result.TheResult); }

24. Code duplication is ok (usually) #4

25.

26.

27.

28.

29. Unit testing is not about writing tests #5

30.

31. × Test123 × CustomerTest × PerchaseOrderTestNew × MoveBatteryVanilla  CalculateTax_InvalidYear_LogErrorToFile  OrdersShouldBeCreated  OrdersWithNoProductsShouldFail

32. "1234567890".Should().Be("0987654321"); Expected string to be "0987654321", but "1234567890" differs near "123" (index 0).

33. Early feedback Safety net Refactoring Design Validate requirements Change your code without fear

34.

35. Thank you drorh@codevalue.net http://blog.drorhelper.com

5 unit testing facts I wish I know 7 years ago

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