A Tale About the Evil Partial Mock and Separation by Layers of Abstractions

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We'll see that every partial mock is a wasted opportunity: instead of dropping a spy in there, think a bit about redesigning the system on finer-grained level of abstractions. Instead of mocking a method in your class, think of extracting it away in another class instead, and use a 'regular' mock. These are the slides from my quickie session at Devoxx Poland 2017: https://youtu.be/pYG0jhCfT2A

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victor.rentea@gmail.com www.VictorRentea.ro @victorrentea#DevoxxPL
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A Tale About The Evil Partial Mock,
And the Separation by Layers of Abstraction
Victor Rentea
!!
HARD
STUFF
WARNING

VictorRentea.ro
Spring, JavaEE, Hibernate
Clean Code, Architectures
Design Patterns
TDD, Coach, Coding Dojos
Java Performance, more...
Victor Rentea
Consultant, Technical Lead
Lead Architect for major IBM client
2
Independent Trainer
Clean Code Evangelist
victor.rentea@gmail.com VictorRentea.ro@victorrentea
1000+ devs. 1500+ hrs. 5 yrs.

VictorRentea.ro
Rules of Simple Design
3
- Kent Beck
https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

VictorRentea.ro4
“Do TDD!
1. Passes the Tests

VictorRentea.ro
Rules of Simple Design
5 https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

VictorRentea.ro6
“Write Expressive Code
 Go to The Art of Clean Code Talk
(today at 1630, Room 1)
2. Reveals Intention

VictorRentea.ro
Rules of Simple Design
7 https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

VictorRentea.ro
DRY
9
Duplication Is Evil
3. No Duplication
D I E

VictorRentea.ro
SPOT
10
Don’t Repeat Yourself
Duplication Is Evil
3. No Duplication
D R Y

VictorRentea.ro11
Don’t Repeat Yourself
Duplication Is Evil
Single Point Of Truth
3. No Duplication
D R Y
S P O T

VictorRentea.ro
Rules of Simple Design
12 https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

VictorRentea.ro13
Premature Overengineering
4. Fewest Elements
Premature Optimization
FEAR
of new functionalities
of not meeting the NFR
Let’s write code, more code....

VictorRentea.ro
Rules of Simple Design
14 https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

VictorRentea.ro
Ordering the
Rules of Simple Design
15
Reveals Intention
No Duplication
Fewest Elements
Passes the Tests

VictorRentea.ro
Ordering the
Rules of Simple Design
16
Reveals Intention
No Duplication
Fewest Elements

VictorRentea.ro
Ordering the
Rules of Simple Design
17
Reveals Intention
No Duplication
Fewest Elements

VictorRentea.ro
Ordering the
Rules of Simple Design
18
Reveals Intention Fewest ElementsVS
CustomerFacade
saveCustomer()
getCustomer()
searchCustomer()
saveCustomerPreferences()
getCustomerPreferences()
validateAddress()
resetPassword()
checkPassworStrength()
CustomerPreferecesFacade
saveCustomerPreferences()
getCustomerPreferences()
validateAddress()
resetPassword()
checkPassworStrength()
CustomerFacade
saveCustomer()
getCustomer()
searchCustomer()
Same level of abstraction
Huh?

VictorRentea.ro
Ordering the
Rules of Simple Design
19
Reveals Intention
No Duplication
Fewest Elements

VictorRentea.ro
Ordering the
Rules of Simple Design
20
No Duplication Fewest ElementsVS
OrderService
AlertService
DeliveryService
Different level of abstraction
Extract for Reuse
sendEmail()
Wat!?
Super-funny IT clip:
https://www.destroyallsoftware.com/talks/wat

@
VictorRentea.ro
In L/XL apps: hard to detect reuse opportunities
 Pair Programming, design brainstorming
21
Extract for Reuse
Increase the Bus Factor

@
VictorRentea.ro22
But what about The First Rule?

@
VictorRentea.ro23
One for All,
All for One
tests production

VictorRentea.ro24
OrderService
EmailService
PARTIAL MOCK
(normal)MOCK
private sendEmail() public sendEmail()
Separation by Layers of Abstraction
A Tale about Test Overlapping and the Evil Partial Mock...
DrivenbyTests
Refactor tests
using mocks
Which methods
are more abstract ?Don’t do that !!
Partial Mocks are Evil !
Oh!.. Why?
Dunno..
Overlaping
Tests !!
public placeOrder()
public shipOrder()
a.k.a. “spy”

VictorRentea.ro26
A Tale about Test Overlapping and the Evil Partial Mock...
Morale
Tempted to use a Partial Mock
to reduce Test Overlapping ?
Try to Separate By Layers of Abstraction
Simple, better factored code/tests

VictorRentea.ro
Rules of Simple Design
27 https://martinfowler.com/bliki/BeckDesignRules.html
2. Reveals Intention
3. No Duplication
4. Fewest Elements
1. Passes the Tests

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Exceptions have been with us for 25 years in Java but have we learned to use them properly? Are checked exceptions a mistake? Should you use throw runtime or checked exceptions? And what to do with a checked exception, when you get one? And how to slay the boss of all exceptions: the NullPointerException. Let’s put these old questions in the context of Java8+ lambdas, Vavr monads, Lombok, Spring, JAX-RS and other modern frameworks, and see the best practices of handling errors in Java today.Let’s put these old questions in the context of Java8+ lambdas, Vavr monads, Lombok, Spring, JAX-RS and other modern frameworks, and see the best practices of handling errors in Java today.

Definitive Guide to Working With Exceptions in Java

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A Tale About the Evil Partial Mock and Separation by Layers of Abstractions

1. victor.rentea@gmail.com www.VictorRentea.ro @victorrentea#DevoxxPL Platinum Sponsor: A Tale About The Evil Partial Mock, And the Separation by Layers of Abstraction Victor Rentea !! HARD STUFF WARNING

2. VictorRentea.ro Spring, JavaEE, Hibernate Clean Code, Architectures Design Patterns TDD, Coach, Coding Dojos Java Performance, more... Victor Rentea Consultant, Technical Lead Lead Architect for major IBM client 2 Independent Trainer Clean Code Evangelist victor.rentea@gmail.com VictorRentea.ro@victorrentea 1000+ devs. 1500+ hrs. 5 yrs.

3. VictorRentea.ro Rules of Simple Design 3 - Kent Beck https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

4. VictorRentea.ro4 “Do TDD! 1. Passes the Tests

5. VictorRentea.ro Rules of Simple Design 5 https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

6. VictorRentea.ro6 “Write Expressive Code  Go to The Art of Clean Code Talk (today at 1630, Room 1) 2. Reveals Intention

7. VictorRentea.ro Rules of Simple Design 7 https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

8. VictorRentea.ro DIE 8 3. No Duplication

9. VictorRentea.ro DRY 9 Duplication Is Evil 3. No Duplication D I E

10. VictorRentea.ro SPOT 10 Don’t Repeat Yourself Duplication Is Evil 3. No Duplication D R Y

11. VictorRentea.ro11 Don’t Repeat Yourself Duplication Is Evil Single Point Of Truth 3. No Duplication D R Y S P O T

12. VictorRentea.ro Rules of Simple Design 12 https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

13. VictorRentea.ro13 Premature Overengineering 4. Fewest Elements Premature Optimization FEAR of new functionalities of not meeting the NFR Let’s write code, more code....

14. VictorRentea.ro Rules of Simple Design 14 https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

15. VictorRentea.ro Ordering the Rules of Simple Design 15 Reveals Intention No Duplication Fewest Elements Passes the Tests

16. VictorRentea.ro Ordering the Rules of Simple Design 16 Reveals Intention No Duplication Fewest Elements

17. VictorRentea.ro Ordering the Rules of Simple Design 17 Reveals Intention No Duplication Fewest Elements

18. VictorRentea.ro Ordering the Rules of Simple Design 18 Reveals Intention Fewest ElementsVS CustomerFacade saveCustomer() getCustomer() searchCustomer() saveCustomerPreferences() getCustomerPreferences() validateAddress() resetPassword() checkPassworStrength() CustomerPreferecesFacade saveCustomerPreferences() getCustomerPreferences() validateAddress() resetPassword() checkPassworStrength() CustomerFacade saveCustomer() getCustomer() searchCustomer() Same level of abstraction Huh?

19. VictorRentea.ro Ordering the Rules of Simple Design 19 Reveals Intention No Duplication Fewest Elements

20. VictorRentea.ro Ordering the Rules of Simple Design 20 No Duplication Fewest ElementsVS OrderService AlertService DeliveryService Different level of abstraction Extract for Reuse sendEmail() Wat!? Super-funny IT clip: https://www.destroyallsoftware.com/talks/wat

21. @ VictorRentea.ro In L/XL apps: hard to detect reuse opportunities  Pair Programming, design brainstorming 21 Extract for Reuse Increase the Bus Factor

22. @ VictorRentea.ro22 But what about The First Rule?

23. @ VictorRentea.ro23 One for All, All for One tests production

24. VictorRentea.ro24 OrderService EmailService PARTIAL MOCK (normal)MOCK private sendEmail() public sendEmail() Separation by Layers of Abstraction A Tale about Test Overlapping and the Evil Partial Mock... DrivenbyTests Refactor tests using mocks Which methods are more abstract ?Don’t do that !! Partial Mocks are Evil ! Oh!.. Why? Dunno.. Overlaping Tests !! public placeOrder() public shipOrder() a.k.a. “spy”

25. VictorRentea.ro25

26. VictorRentea.ro26 A Tale about Test Overlapping and the Evil Partial Mock... Morale Tempted to use a Partial Mock to reduce Test Overlapping ? Try to Separate By Layers of Abstraction Simple, better factored code/tests

27. VictorRentea.ro Rules of Simple Design 27 https://martinfowler.com/bliki/BeckDesignRules.html 2. Reveals Intention 3. No Duplication 4. Fewest Elements 1. Passes the Tests

28. victor.rentea@gmail.com www.VictorRentea.ro @victorrentea#DevoxxPL Platinum Sponsor: A Tale About The Evil Partial Mock, And the Separation by Layers of Abstraction Victor Rentea

29. victor.rentea@gmail.com www.VictorRentea.ro @victorrentea#DevoxxPL Platinum Sponsor: A Tale About The Evil Partial Mock, And the Separation by Layers of Abstraction Victor Rentea Expressive Code The Art of Clean Code Want more ? 16:30

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