About the Starter Kit xi
Preface xiii
1 Introduction 1
1.1 Coding With Confidence 2
1.2 What is Unit Testing? 3
1.3 Why Should I Bother with Unit Testing? 4
1.4 What Do I Want to Accomplish? 5
1.5 How Do I Do Unit Testing? 7
1.6 Excuses For Not Testing 7
1.7 Roadmap 12
2 Your First Unit Tests 13
2.1 Planning Tests 14
2.2 Testing a Simple Method 15
2.3 Running Tests with NUnit 16
2.4 Running the Example 22
2.5 More Tests 26
3 Writing Tests in NUnit 27
3.1 Structuring Unit Tests 27
3.2 NUnit Asserts 29
3.3 NUnit Framework 31
3.4 NUnit Test Selection 33
3.5 NUnit Custom Asserts 40
3.6 NUnit and Exceptions 41
3.7 Temporarily Ignoring Tests 42
4 What to Test: The Right-BICEP 45
4.1 Are the Results Right? 46
4.2 Boundary Conditions 49
4.3 Check Inverse Relationships 50
4.4 Cross-check Using Other Means 50
4.5 Force Error Conditions 51
4.6 Performance Characteristics 52
5 Correct Boundary Conditions 55
5.1 Conformance 56
5.2 Ordering 57
5.3 Range 59
5.4 Reference 62
5.5 Existence 63
5.6 Cardinality 64
5.7 Time 66
5.8 Try It Yourself 68
6 Using Mock Objects 73
6.1 Simple Stubs 74
6.2 Mock Objects 75
6.3 Formalizing Mock Objects 79
6.4 When Not To Mock 93
7 Properties of Good Tests 95
7.1 Automatic 96
7.2 Thorough 97
7.3 Repeatable 99
7.4 Independent 99
7.5 Professional 100
7.6 Testing the Tests 102
8 Testing on a Project 105
8.1 Where to Put Test Code 105
8.2 Test Courtesy 108
8.3 Test Frequency 109
8.4 Tests and Legacy Code 110
8.5 Tests and Reviews 113
9 Design Issues 117
9.1 Designing for Testability 117
9.2 Refactoring for Testing 119
9.3 Testing the Class Invariant 130
9.4 Test-Driven Design 132
9.5 Testing Invalid Parameters 134
A Gotchas 137
A.1 As Long As The Code Works 137
A.2 "Smoke" Tests 137
A.3 "Works On My Machine" 138
A.4 Floating-Point Problems 138
A.5 Tests Take Too Long 139
A.6 Tests Keep Breaking 139
A.7 Tests Fail on Some Machines 140
B Resources 141
B.1 On The Web 141
B.2 Bibliography 143
C Summary: Pragmatic Unit Testing 145
D Answers to Exercises