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Effective

Unit

Testing

Aguidefor

Java developers

LASSEKOSKELA

11

MANNING

ShelterIsland

contents preface xv acknowledgments xvii aboutthisbookxix aboutthecoverillustrationxxiv

Part1Foundations

1 The promiseofgood tests3

1.1Stateoftheunion:

writing bettertests4 1.2

Thevalueof

having tests 5

Factors

ofproductivity

8*Thecurve

ofdesignpotential 10

1.3Testsasa

design tool10

Test-driven

development 11

Behavior-driven

development 13 1.4

Summary

14

Insearch

ofgood 15 2.1

Readablecodeismaintainablecode16

2.2Structure

helps makesenseof things 18

2.3It'snot

good ifit's testing the wrongthings 20 2.4

Independent

testsrun easily insolitude21 ix

XCONTENTS

2.5Reliabletestsarereliable23

2.6 Every tradehasitstoolsandtestsareno exception 25
2.7

Summary

26

Testdoubles27

3.1The

power ofatestdouble 28

Isolating

thecodeundertest28

Speedingup

testexecution30

Making

executiondeterministic31

Simulatingspecial

conditions32

Exposing

hidden information 32
3.2 Types oftestdoubles33

Teststubsare

unusually short things 34
Fake objects doit withoutside effects 35
Test spies steal your secrets36 Mock objectsobject to surprises 38

3.3Guidelinesfor

using testdoubles39

Pickthe

right double for thetest40*

Arrange,act,

assert40 Check forbehavior, not implementation

42*Choose

your tools42

Injectyourdependencies

43
3.4

Summary

44

Part2Catalog45

Readability

47

4.1Primitiveassertions48

Example

48*Whattodoaboutit?49*

Summary

51
4.2

Hyperassertions

51

Example

51

Whattodoaboutit154

Summary

55

4.3Bitwiseassertions56

Example

56*Whattodoaboutit?56*

Summary

57

4.4Incidentaldetails57

Example

57*Whattodoaboutit?58*

Summary

60
4.5

Splitpersonality

60

Example

61*What

todoaboutit?61

Summary

64
4.6

Splitlogic

64

Example

65*Whattodoaboutit?66

Summary

69
4.7 Magic numbers70

Example

70*Whattodoaboutit?71

Summary

71

CONTENTS

4.8 Setup sermon72

Example

72*Whattodoaboutit?73*

Summary

74
4.9

Overprotective

tests75

Example

75

Whattodoaboutit?76*

Summary

76
4.10

Summary

76

Maintainability

78
5.1

Duplication

79

Example

79*Whattodoaboutit?80*

Summary

82

5.2Conditional

logic 82

Example

83

Whattodoaboutit?83

Summary

84
5.3 Flaky test85

Example

85*

Whattodoaboutit?86*

Summary

87
5.4

Crippling

file path 88

Example

88*

Whattodoaboutit?89

Summary

90

5.5Persistent

temp files91

Example

91

Whattodoaboutit?92*

Summary

93
5.6

Sleeping

snail 94

Example

94

Whattodoaboutit?95*

Summary

96

5.7Pixel

perfection 97

Example

97*Whattodoaboutit?98*

Summary

101

5.8Parameterized

mess102

Example

103*Whattodoaboutit?106*

Summary

108

5.9Lackofcohesioninmethods108

Example

109*Whattodoaboutit?110*

Summary

112
5.10

Summary

quotesdbs_dbs14.pdfusesText_20