React Hooks broke my tests, now what? - CityJS London 2023

Slide 1

Slide 1 text

Hello CityJS @danieljcafonso

Slide 2

Slide 2 text

2 @danieljcafonso

Slide 3

Slide 3 text

3 @danieljcafonso

Slide 4

Slide 4 text

4 @danieljcafonso

Slide 5

Slide 5 text

5 @danieljcafonso

Slide 6

Slide 6 text

6 @danieljcafonso

Slide 7

Slide 7 text

7 @danieljcafonso

Slide 8

Slide 8 text

8 @danieljcafonso

Slide 9

Slide 9 text

9 @danieljcafonso

Slide 10

Slide 10 text

React Hooks broke my tests, now what? Daniel Afonso @danieljcafonso 31.03.2023

Slide 11

Slide 11 text

@danieljcafonso www.danieljcafonso.com 11 Daniel Afonso Developer Advocate Egghead.io Instructor Auth0 Ambassador

Slide 12

Slide 12 text

@danieljcafonso www.danieljcafonso.com 12 Daniel Afonso Developer Advocate Egghead.io Instructor Auth0 Ambassador

Slide 13

Slide 13 text

@danieljcafonso 13 The testing issue

Slide 14

Slide 14 text

@danieljcafonso 14 The testing issue

Slide 15

Slide 15 text

@danieljcafonso 15 The testing issue

Slide 16

Slide 16 text

@danieljcafonso 16 The testing issue

Slide 17

Slide 17 text

@danieljcafonso 17 The testing issue

Slide 18

Slide 18 text

@danieljcafonso 18 Testing implementation details

Slide 19

Slide 19 text

Implementation details are things which users of your code will not typically use, see, or even know about. - Kent C. Dodds https://kentcdodds.com/blog/testing- implementation-details

Slide 20

Slide 20 text

@danieljcafonso 20 The testing shift

Slide 21

Slide 21 text

@danieljcafonso 21 The testing shift Render the entire component

Slide 22

Slide 22 text

@danieljcafonso 22 The testing shift Render the entire component Search like the user

Slide 23

Slide 23 text

@danieljcafonso 23 The testing shift Render the entire component Search like the user See if are on the right tab

Slide 24

Slide 24 text

@danieljcafonso 24 The testing shift Render the entire component Search like the user See if are on the right tab Is the data on the dropdown

Slide 25

Slide 25 text

@danieljcafonso 25 Think like the user

Slide 26

Slide 26 text

@danieljcafonso 26 Testing Library

Slide 27

Slide 27 text

@danieljcafonso 27 What do we need to know?

Slide 28

Slide 28 text

@danieljcafonso 28 What do we need to know? Queries 01

Slide 29

Slide 29 text

@danieljcafonso 29 What do we need to know? Queries 01 02 Firing Events

Slide 30

Slide 30 text

@danieljcafonso 30 What do we need to know? Queries 01 02 03 Firing Events Utils

Slide 31

Slide 31 text

@danieljcafonso 31 What do we need to know? Queries 01 02 03 Firing Events Utils

Slide 32

Slide 32 text

@danieljcafonso 32 What do we need to know? Queries 01 02 03 Firing Events Utils queryBy*

Slide 33

Slide 33 text

@danieljcafonso 33 What do we need to know? Queries 01 02 03 Firing Events Utils queryBy* getBy*

Slide 34

Slide 34 text

@danieljcafonso 34 What do we need to know? Queries 01 02 03 Firing Events Utils queryBy* getBy* findBy*

Slide 35

Slide 35 text

@danieljcafonso 35 What do we need to know? Queries 01 02 03 Firing Events Utils queryAllBy* getAllBy* findAllBy*

Slide 36

Slide 36 text

@danieljcafonso 36 What do we need to know? Queries 01 02 03 Firing Events Utils

Slide 37

Slide 37 text

@danieljcafonso 37 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone

Slide 38

Slide 38 text

@danieljcafonso 38 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone Semantic Queries

Slide 39

Slide 39 text

@danieljcafonso 39 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone Semantic Queries Test IDs

Slide 40

Slide 40 text

@danieljcafonso 40 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone Semantic Queries Test IDs Manual Queries

Slide 41

Slide 41 text

@danieljcafonso Queries Accessible to Everyone Semantic Queries Test IDs Manual Queries 41 What do we need to know? Queries 01 02 03 Firing Events Utils Start here

Slide 42

Slide 42 text

@danieljcafonso 42 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone *ByLabelText, *ByPlaceholderText,*ByRole, *ByDisplayValue, *ByText

Slide 43

Slide 43 text

@danieljcafonso 43 What do we need to know? Queries 01 02 03 Firing Events Utils Queries Accessible to Everyone

Slide 44

Slide 44 text

@danieljcafonso 44 What do we need to know? Queries 01 02 03 Firing Events Utils Semantic Queries *ByAltText, *ByTitle

Slide 45

Slide 45 text

@danieljcafonso 45 What do we need to know? Queries 01 02 03 Firing Events Utils Semantic Queries

Slide 46

Slide 46 text

@danieljcafonso 46 What do we need to know? Queries 01 02 03 Firing Events Utils Test IDs *ByTestId

Slide 47

Slide 47 text

@danieljcafonso 47 What do we need to know? Queries 01 02 03 Firing Events Utils Test IDs

Slide 48

Slide 48 text

@danieljcafonso 48 What do we need to know? Queries 01 02 03 Firing Events Utils Manual Queries querySelector DOM API

Slide 49

Slide 49 text

@danieljcafonso 49 What do we need to know? Queries 01 02 03 Firing Events Utils Manual Queries

Slide 50

Slide 50 text

@danieljcafonso 50 What do we need to know? Queries 01 02 03 Firing Events Utils https://testing-playground.com/

Slide 51

Slide 51 text

@danieljcafonso 51 What do we need to know? Queries 01 02 03 Firing Events Utils fireEvent

Slide 52

Slide 52 text

@danieljcafonso 52 What do we need to know? Queries 01 02 03 Firing Events Utils user-event

Slide 53

Slide 53 text

@danieljcafonso 53 What do we need to know? Queries 01 02 03 Firing Events Utils waitFor

Slide 54

Slide 54 text

@danieljcafonso 54 What do we need to know? Queries 01 02 03 Firing Events Utils waitForElementToBeRemoved

Slide 55

Slide 55 text

@danieljcafonso 55 What do we need to know? Queries 01 02 03 Firing Events Utils screen

Slide 56

Slide 56 text

@danieljcafonso 56 What do we need to know? Queries 01 02 03 Firing Events Utils debug

Slide 57

Slide 57 text

@danieljcafonso 57 What do we need to know? Queries 01 02 03 Firing Events Utils within

Slide 58

Slide 58 text

@danieljcafonso 58 Common mistakes ● Using act ● Using getBy with expect().not.toBeInTheDocument() ● Using await with fireEvent or non async queries ● Using await waitFor() ● Using cleanup ● Using waitFor with synchronous queries ● Using side effects inside waitFor

Slide 59

Slide 59 text

@danieljcafonso 59 Using act Common Mistakes

Slide 60

Slide 60 text

@danieljcafonso 60 Using act Common Mistakes

Slide 61

Slide 61 text

@danieljcafonso 61 Using getBy with expect().not.toBeInTheDocument() Common Mistakes

Slide 62

Slide 62 text

@danieljcafonso 62 Using getBy with expect().not.toBeInTheDocument() Common Mistakes

Slide 63

Slide 63 text

@danieljcafonso 63 Using await with fireEvent or non async queries Common Mistakes

Slide 64

Slide 64 text

@danieljcafonso 64 Using await with fireEvent or non async queries Common Mistakes

Slide 65

Slide 65 text

@danieljcafonso 65 Using await waitFor() Common Mistakes

Slide 66

Slide 66 text

@danieljcafonso 66 Using await waitFor() Common Mistakes

Slide 67

Slide 67 text

@danieljcafonso 67 Using cleanup Common Mistakes

Slide 68

Slide 68 text

@danieljcafonso 68 Using cleanup Common Mistakes * if your framework supports the afterEach global

Slide 69

Slide 69 text

@danieljcafonso 69 Using waitFor with synchronous queries Common Mistakes

Slide 70

Slide 70 text

@danieljcafonso 70 Using waitFor with synchronous queries Common Mistakes

Slide 71

Slide 71 text

@danieljcafonso 71 Using side effects inside waitFor Common Mistakes

Slide 72

Slide 72 text

@danieljcafonso 72 Using side effects inside waitFor Common Mistakes

Slide 73

Slide 73 text

@danieljcafonso 73 eslint-plugin-testing-library https://github.com/testing-library/eslint-plugin-testing-library

Slide 74

Slide 74 text

@danieljcafonso 74 was not wrapped in act(...)

Slide 75

Slide 75 text

@danieljcafonso 75 was not wrapped in act(...)

Slide 76

Slide 76 text

@danieljcafonso 76 was not wrapped in act(...)

Slide 77

Slide 77 text

@danieljcafonso 77 was not wrapped in act(...)

Slide 78

Slide 78 text

@danieljcafonso 78 was not wrapped in act(...)

Slide 79

Slide 79 text

@danieljcafonso 79 was not wrapped in act(...)

Slide 80

Slide 80 text

@danieljcafonso 80

Slide 81

Slide 81 text

81 Scan Me Daniel Afonso React Hooks broke my tests, now what? Thank you! @danieljcafonso

Slide 82

Slide 82 text

No content