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Chapter 07: Writing Test Code: Difference between revisions

Created page with "<span id="chapter-07-writing-test-code"></span> = Chapter 07: Writing Test Code = Testing is crucial for building reliable Spring Boot applications. In this chapter, we’ll explore comprehensive testing strategies using modern Kotlin testing frameworks. You’ll learn about unit testing, integration testing, test patterns, and how to use Kotest, MockK, and other tools to create maintainable test suites. We’ll also cover test-driven development practices and code cove..."
 
 
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// - What if the business rules change?
// - What if the business rules change?
// - What happens with null values?</syntaxhighlight>
// - What happens with null values?</syntaxhighlight>
'''With proper testing, we ensure:''' - '''Correctness''': Code behaves as expected - '''Regression Prevention''': Changes don’t break existing functionality - '''Design Quality''': Testable code is usually better designed - '''Documentation''': Tests serve as executable specifications - '''Confidence''': Safe refactoring and feature additions
'''With proper testing, we ensure:'''  
* '''Correctness''': Code behaves as expected  
* '''Regression Prevention''': Changes don’t break existing functionality  
* '''Design Quality''': Testable code is usually better designed  
* '''Documentation''': Tests serve as executable specifications  
* '''Confidence''': Safe refactoring and feature additions


<span id="testing-pyramid-for-spring-boot"></span>
<span id="testing-pyramid-for-spring-boot"></span>
=== 7.1.2 Testing Pyramid for Spring Boot ===
=== 7.1.2 Testing Pyramid for Spring Boot ===


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     /                  \
     /                  \
     /    Unit Tests      \
     /    Unit Tests      \
   /____________________\</pre>
   /______________________\</pre>
'''Unit Tests (70%)''': - Fast execution (&lt; 1 second) - Test individual components in isolation - Use mocking for dependencies - Focus on business logic
'''Unit Tests (70%)''':  
* Fast execution (&lt; 1 second)  
* Test individual components in isolation  
* Use mocking for dependencies - Focus on business logic


'''Integration Tests (20%)''': - Test component interactions - Include database, web layer, or external services - Slower execution but higher confidence - Test real scenarios
'''Integration Tests (20%)''':  
* Test component interactions  
* Include database, web layer, or external services  
* Slower execution but higher confidence  
* Test real scenarios


'''UI/End-to-End Tests (10%)''': - Test complete user journeys - Slowest but most comprehensive - Usually automated browser testing
'''UI/End-to-End Tests (10%)''':  
* Test complete user journeys  
* Slowest but most comprehensive  
* Usually automated browser testing


<span id="testing-philosophy"></span>
<span id="testing-philosophy"></span>
=== 7.1.3 Testing Philosophy ===
=== 7.1.3 Testing Philosophy ===


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=== 7.2.3 When to Use Each Type ===
=== 7.2.3 When to Use Each Type ===


'''Use Unit Tests When:''' - Testing business logic in isolation - Validating edge cases and error conditions - Testing pure functions or methods with clear inputs/outputs - Need fast feedback during development
'''Use Unit Tests When:'''  
* Testing business logic in isolation  
* Validating edge cases and error conditions  
* Testing pure functions or methods with clear inputs/outputs  
* Need fast feedback during development


'''Use Integration Tests When:''' - Testing database interactions - Validating component interactions - Testing configuration and wiring - Verifying end-to-end scenarios
'''Use Integration Tests When:'''  
* Testing database interactions  
* Validating component interactions  
* Testing configuration and wiring  
* Verifying end-to-end scenarios


<span id="test-code-patterns-and-quality"></span>
<span id="test-code-patterns-and-quality"></span>
== 7.3 Test Code Patterns and Quality ==
== 7.3 Test Code Patterns and Quality ==


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