Better, cleaner codeevery developer's dream. Test-driven development is how you'll achieve it! From creating a robust test infrastructure to designing methods, classes, and packages that will stand the test of time, this book provides in-depth instructions for revitalizing your programming. Whether you're writing new code or fixing legacy code, you'll learn to select test cases, use test doubles, and generate test data. With information on agile methodology to round out the development process, you'll have all the tools you need!

Highlights:

1. Object-oriented design
2. Refactoring legacy code
3. Test-driven maintenance
4. Test infrastructure
5. Test pyramid
6. Test code design pattern
7. Global test doubles
8. Test class hierarchies
9. Test data classes
10. ABAP Development Tools (ADT)

11. Agile development

    Create integration tests, component tests, and more

    Klappentext

    Better, cleaner code-every developer's dream. Test-driven development is how you'll achieve it! From creating a robust test infrastructure to designing methods, classes, and packages that will stand the test of time, this book provides in-depth instructions for revitalizing your programming. Whether you're writing new code or fixing legacy code, you'll learn to select test cases, use test doubles, and generate test data. With information on agile methodology to round out the development process, you'll have all the tools you need!

    Highlights:

    1. Object-oriented design
    2. Refactoring legacy code
    3. Test-driven maintenance
    4. Test infrastructure
    5. Test pyramid
    6. Test code design pattern
    7. Global test doubles
    8. Test class hierarchies
    9. Test data classes
    10. ABAP Development Tools (ADT)
    11. Agile development

    Inhalt
    ... Foreword ... 23

    ... Preface ... 25

    ... Continuous Improvements ... 25

    ... Agile Methods ... 26

    ... Target Groups and Prerequisites ... 26

    ... Structure of the Book ... 27

    ... Information Boxes ... 30

    ... Limitations ... 30

    ... Acknowledgments ... 31

    1 ... Introduction ... 33

    1.1 ... Sustainability: Development and Maintenance with a Test Infrastructure ... 34

    1.2 ... Agility: Practices of Agile Software Engineering ... 39

    1.3 ... Efficiency: Compliance with Design Principles ... 40

    1.4 ... Effectivity: Communication with Diagrams ... 44

    1.5 ... Summary ... 46

    PART I ... Building a Test Infrastructure ... 47

    2 ... The Sample Application ... 49

    2.1 ... Master Data Management ... 50

    2.2 ... User Interface ... 52

    2.3 ... Backend ... 54

    2.4 ... Summary ... 56

    3 ... Code-Based Test Improvement ... 57

    3.1 ... Introduction to the Test Code ... 57

    3.2 ... General Clean Code Principles ... 70

    3.3 ... Test-Oriented Clean Code Principles ... 79

    3.4 ... Summary ... 86

    4 ... Design-Based Test Improvement ... 87

    4.1 ... Base Classes of Test Classes ... 87

    4.2 ... Usage of Help Classes by Test Classes ... 93

    4.3 ... Summary ... 100

    5 ... Robust Integration Test ... 103

    5.1 ... Improvement Process ... 103

    5.2 ... Independence of Test Methods ... 104

    5.3 ... Repeatability of Test Methods ... 108

    5.4 ... Summary ... 116

    6 ... Minimizing Dependencies ... 117

    6.1 ... Simplification of Use ... 118

    6.2 ... Segregation of Use ... 125

    6.3 ... Independence of Creations ... 129

    6.4 ... Independence of Extensions ... 135

    6.5 ... Summary ... 139

    7 ... Isolated Component Test ... 141

    7.1 ... Transforming the Integration Test ... 142

    7.2 ... Scaling with a Test Language ... 154

    7.3 ... Test-Driven Development ... 161

    7.4 ... Liskov Substitution Principle ... 165

    7.5 ... Summary ... 167

    8 ... Redesign with Unit Tests ... 169

    8.1 ... Object-Oriented API for Entities ... 171

    8.2 ... Highlighting Changes as an Independent Component ... 174

    8.3 ... Tests for the Highlight Changes Class ... 182

    8.4 ... Summary ... 187

    PART II ... Test-Oriented ABAP Design ... 189

    9 ... Designing Methods ... 191

    9.1 ... Rules for Implementing Methods ... 192

    9.2 ... Rules for Method Signatures ... 200

    9.3 ... Summary ... 213

    10 ... Designing Classes ... 215

    10.1 ... Creation of an Object by Its Class ... 216

    10.2 ... Creation of an Object by a Factory Class ... 219

    10.3 ... Types of Dependencies between Classes ... 222

    10.4 ... Interfaces of a Class ... 225

    10.5 ... Levels of Abstraction within a Class ... 228

    10.6 ... Catalog Design Pattern ... 235

    10.7 ... Cohesion ... 237

    10.8 ... Summary ... 242

    11 ... Designing Packages ... 245

    11.1 ... Package Concept ... 245

    11.2 ... Product Packages ... 251

    11.3 ... Test Packages ... 253

    11.4 ... Summary ... 255

    12 ... Test Cases ... 257

    12.1 ... Test Design ... 257

    12.2 ... Test Pyramid ... 261

    12.3 ... Test Coverage ... 264

    12.4 ... Summary ... 266

    13 ... Test Doubles ... 267

    13.1 ... Advantages of Test Doubles ... 267

    13.2 ... Specifying Test Doubles ... 271

    13.3 ... Designing Test Doubles ... 277

    13.4 ... Injecting Test Doubles ... 282

    13.5 ... Summary ... 296

    14 ... Global Test Doubles ... 297

    14.1 ... Test Double for a Method ... 298

    14.2 ... Test Double for Two Methods ... 303

    14.3 ... Method Doubles and Their Combinations ... 309

    14.4 ... Globalizing Test Doubles ... 316

    14.5 ... Designing Global Test Doubles ... 318

    14.6 ... Adapting the Design of Global Test Doubles ... 320

    14.7 ... Summary ... 325

    15 ... Test Classes ... 327

    15.1 ... ABAP Unit Test Framework ... 327

    15.2 ... Local Test Classes ... 329

    15.3 ... Design Patterns for Test Classes ... 332

    15.4 ... Test Class Hierarchies ... 335

    15.5 ... Global Test Classes ... 339

    15.6 ... Summary ... 342

    16 ... Test Data ... 343

    16.1 ... Test Data Container ... 343

    16.2 ... Test Data Objects ... 352

    16.3 ... Summary ... 362

    17 ... Test Infrastructures ... 363

    17.1 ... Components of Test Infrastructures ... 363

    17.2 ... Application Scenarios for a Global Test Infrastructure ... 365

    17.3 ... Development Processes Using a Test Infrastructure ... 370

    17.4 ... Summary ... 373

    PART III ... Agile Development of a New Application ... 375

    18 ... Preparation for Test-Driven Development ... 377

    18.1 ... Specification of the Sample Application ... 378

    18.2 ... Architecture and Design of the Sample Application ... 380

    18.3 ... Test Strategy for the Sample Application ... 385

    18.4 ... Skeleton of the Sample Application ... 388

    18.5 ... Summary ... 401

    19 ... Test-Driven Development ... 403

    19.1 ... Acceptance Test-Driven Development ... 403

    19.2 ... Component Test-Driven Development ... 406

    19.3 ... Unit Test-Driven Development ... 411

    19.4 ... Completion and Improvement of the First Acceptance Test ... 414

    19.5 ... Extension of the Acceptance Test Suite ... 418

    19.6 ... Summary ... 425

    PART IV ... Agile Methodology ... 427

    20 ... Scrum ... 429

    20.1 ... Artifacts ... 430

    20.2 ... Roles ... 436

    20.3 ... Meetings ... 437

    20.4 ... Characteristics ... 442

    20.5 ... Summary ... 443

    **21 ... Agile Software Engineerin…