Introduction
JUnit Test Suites allow you to group multiple test classes and run them together. This is useful for organizing and executing related tests in a cohesive manner. In JUnit 5, test suites are created using the @Suite
annotation from the junit-platform-suite
library.
Maven Dependencies
To use JUnit 5 and the JUnit Platform Suite, you need to add the following dependencies to your pom.xml
file:
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.10.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>5.10.3</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-suite</artifactId>
<version>1.10.3</version>
<scope>test</scope>
</dependency>
</dependencies>
Explanation of Dependencies
- JUnit Jupiter API (
junit-jupiter-api
): This dependency provides the JUnit 5 annotations and assertions. It includes the core API for writing tests. - JUnit Jupiter Engine (
junit-jupiter-engine
): This dependency is the runtime engine that executes JUnit 5 tests. It integrates with your build tool or IDE to run the tests. - JUnit Platform Suite (
junit-platform-suite
): This dependency allows you to define and run test suites using the@Suite
annotation. It provides the necessary classes and annotations to create and manage test suites.
Example: Student Management System
Let's create a simple Student
class and write tests for its methods. Then, we'll create a test suite to run these tests together.
Student Class
public class Student {
private String name;
private int age;
private String email;
public Student(String name, int age, String email) {
this.name = name;
this.age = age;
this.email = email;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getEmail() {
return email;
}
public void setAge(int age) {
this.age = age;
}
public void setEmail(String email) {
this.email = email;
}
}
Student Tests
StudentTest
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class StudentTest {
@Test
void testStudentCreation() {
Student student = new Student("John Doe", 20, "john.doe@example.com");
assertEquals("John Doe", student.getName());
assertEquals(20, student.getAge());
assertEquals("john.doe@example.com", student.getEmail());
}
}
StudentUpdateTest
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
public class StudentUpdateTest {
@Test
void testSetAge() {
Student student = new Student("John Doe", 20, "john.doe@example.com");
student.setAge(21);
assertEquals(21, student.getAge());
}
@Test
void testSetEmail() {
Student student = new Student("John Doe", 20, "john.doe@example.com");
student.setEmail("john.new@example.com");
assertEquals("john.new@example.com", student.getEmail());
}
}
Creating a Test Suite
Create a test suite to run the StudentTest
and StudentUpdateTest
classes together.
StudentTestSuite
import org.junit.platform.suite.api.IncludeClassNamePatterns;
import org.junit.platform.suite.api.SelectClasses;
import org.junit.platform.suite.api.Suite;
@Suite
@SelectClasses({StudentTest.class, StudentUpdateTest.class})
@IncludeClassNamePatterns({"^.*Test$"})
public class StudentTestSuite {
}
Explanation of Test Suite
- @Suite: This annotation is used to indicate that the class is a JUnit test suite.
- @SelectClasses: This annotation specifies the test classes that should be included in the suite. In this example,
StudentTest
andStudentUpdateTest
are included. - @IncludeClassNamePatterns: This annotation is used to include test classes based on a regex pattern. Here, it includes all classes that end with
Test
.
Running the Test Suite
Using IntelliJ IDEA
- Run Tests: Right-click on the
StudentTestSuite
file and selectRun 'StudentTestSuite'
. - View Results: The results will be displayed in the Run window, showing the tests executed from both
StudentTest
andStudentUpdateTest
.
Using Eclipse
- Run Tests: Right-click on the
StudentTestSuite
file and selectRun As
>JUnit Test
. - View Results: The results will be displayed in the JUnit view, showing the tests executed from both
StudentTest
andStudentUpdateTest
.
Conclusion
JUnit Test Suites provide a convenient way to group and run related test classes together. By using the @Suite
annotation and the JUnit Platform Suite library, you can organize your tests efficiently and ensure they are executed in a cohesive manner. This approach helps manage large test suites and maintain organized test structures.
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