Yay! Mocks! - Speaker Deck

Slide 1

Slide 1 text

Tuesday, June 26, 2012

Slide 2

Slide 2 text

YAY! Mocks! @coreyhaines Nordicy RubyConf 2012 Tuesday, June 26, 2012

Slide 3

Slide 3 text

YAY! Test Doubles! @coreyhaines Nordicy RubyConf 2012 Tuesday, June 26, 2012

Slide 4

Slide 4 text

Zak! Tuesday, June 26, 2012

Slide 5

Slide 5 text

Test-Driven Development Tuesday, June 26, 2012

Slide 6

Slide 6 text

Object-Oriented is about messages Tuesday, June 26, 2012

Slide 7

Slide 7 text

Object-Oriented is about interactions Tuesday, June 26, 2012

Slide 8

Slide 8 text

Object-Oriented is about services Tuesday, June 26, 2012

Slide 9

Slide 9 text

Roles vs Things Tuesday, June 26, 2012

Slide 10

Slide 10 text

Test-Driven Development Tuesday, June 26, 2012

Slide 11

Slide 11 text

Test-First Development Tuesday, June 26, 2012

Slide 12

Slide 12 text

Test-Driven vs Test-First Tuesday, June 26, 2012

Slide 13

Slide 13 text

Reaction to pain Tuesday, June 26, 2012

Slide 14

Slide 14 text

Test-First -> Change Tests Tuesday, June 26, 2012

Slide 15

Slide 15 text

Test-Driven -> Change Design Tuesday, June 26, 2012

Slide 16

Slide 16 text

Test-Doubles Often Highlight Pain Tuesday, June 26, 2012

Slide 17

Slide 17 text

Zak! Tuesday, June 26, 2012

Slide 18

Slide 18 text

Examples Tuesday, June 26, 2012

Slide 19

Slide 19 text

Showing list of Coderetreats for today Tuesday, June 26, 2012

Slide 20

Slide 20 text

You have to change your test When you change this hash Tuesday, June 26, 2012

Slide 21

Slide 21 text

Feels Very Fragile Tuesday, June 26, 2012

Slide 22

Slide 22 text

PAIN! Tuesday, June 26, 2012

Slide 23

Slide 23 text

Discomfort! Tuesday, June 26, 2012

Slide 24

Slide 24 text

Tuesday, June 26, 2012

Slide 25

Slide 25 text

Why is this information relevant to the controller? Tuesday, June 26, 2012

Slide 26

Slide 26 text

Bypassing Layers Tuesday, June 26, 2012

Slide 27

Slide 27 text

This is odd Tuesday, June 26, 2012

Slide 28

Slide 28 text

Controller calling database? Tuesday, June 26, 2012

Slide 29

Slide 29 text

Controller should know ‘WHAT’ not ‘HOW’ Tuesday, June 26, 2012

Slide 30

Slide 30 text

Better to insert a layer Tuesday, June 26, 2012

Slide 31

Slide 31 text

Controller Business-Oriented Services DB Tuesday, June 26, 2012

Slide 32

Slide 32 text

What, not How Tuesday, June 26, 2012

Slide 33

Slide 33 text

Better to delegate the How Tuesday, June 26, 2012

Slide 34

Slide 34 text

TDD is about design Tuesday, June 26, 2012

Slide 35

Slide 35 text

Change design, not tests Tuesday, June 26, 2012

Slide 36

Slide 36 text

Focusing on usage Tuesday, June 26, 2012

Slide 37

Slide 37 text

I like Presenters! Tuesday, June 26, 2012

Slide 38

Slide 38 text

Tuesday, June 26, 2012

Slide 39

Slide 39 text

double depending on doubles?? Tuesday, June 26, 2012

Slide 40

Slide 40 text

UGH! Tuesday, June 26, 2012

Slide 41

Slide 41 text

Too much detail at this level? Jumping levels of abstraction? Tuesday, June 26, 2012

Slide 42

Slide 42 text

Change design to fix pain Tuesday, June 26, 2012

Slide 43

Slide 43 text

Simplify our example Tuesday, June 26, 2012

Slide 44

Slide 44 text

Simplify our example Tuesday, June 26, 2012

Slide 45

Slide 45 text

Much simpler, more focused on what the controller needs to know Tuesday, June 26, 2012

Slide 46

Slide 46 text

Tuesday, June 26, 2012

Slide 47

Slide 47 text

TDD is about refactoring Tuesday, June 26, 2012

Slide 48

Slide 48 text

TDD is about refactoring away from discomfort Tuesday, June 26, 2012

Slide 49

Slide 49 text

Changing your design, to fix pain Tuesday, June 26, 2012

Slide 50

Slide 50 text

Test doubles can help highlight and fix pain Tuesday, June 26, 2012

Slide 51

Slide 51 text

Take-Home Challenge Tuesday, June 26, 2012

Slide 52

Slide 52 text

Tuesday, June 26, 2012

Slide 53

Slide 53 text

Coupled Roles Tuesday, June 26, 2012

Slide 54

Slide 54 text

Unnecessary noise Tuesday, June 26, 2012

Slide 55

Slide 55 text

or false positive if yesterday’s or tomorrow’s are not created in database Tuesday, June 26, 2012

Slide 56

Slide 56 text

How to change design to fix this? Tuesday, June 26, 2012

Slide 57

Slide 57 text

Thanks! @coreyhaines Nordicy RubyConf 2012 font inspiration: bit.ly/corey-sans Tuesday, June 26, 2012