Test-Driven Development (TDD) helps you build robust applications by writing tests before implementing business logic. With Spring Boot, writing unit tests is fast, clean, and efficient.
Test-Driven Development (TDD) helps you build robust applications by writing tests before implementing business logic. With Spring Boot, writing unit tests is fast, clean, and efficient.
In this section, we clarify Why Use TDD in Spring Boot? and summarize the key points you will apply in implementation.
Make sure you have:
Add Spring Boot's test starter to your project.
Maven:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency>
Gradle:
testImplementation 'org.springframework.boot:spring-boot-starter-test'
Create a simple unit test before implementing the service.
Now implement the GreetingService to pass the test.
Use your build tool to run the tests:
./mvnw test
Or with Gradle:
gradle test
You should see the test pass ✅
Now that your test passes, you can safely refactor your code. TDD is a loop:
You now have a practical Spring Boot Test-Driven Development implementation with a clear, production-friendly Spring Boot structure. As a next step, adapt configuration and tests to your own domain, then validate behavior under realistic traffic and failure scenarios.
package com.example.tdd; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class GreetingServiceTest { @Test void shouldReturnGreetingMessage() { GreetingService service = new GreetingService(); String result = service.greet("World"); assertEquals("Hello, World!", result); } }
package com.example.tdd import org.junit.jupiter.api.Assertions.assertEquals import org.junit.jupiter.api.Test class GreetingServiceTest { @Test fun shouldReturnGreetingMessage() { val service = GreetingService() val result = service.greet("World") assertEquals("Hello, World!", result) } }
package com.example.tdd; public class GreetingService { public String greet(String name) { return "Hello, " + name + "!"; } }
package com.example.tdd class GreetingService { fun greet(name: String): String { return "Hello, $name!" } }
