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In this section, we will explore how to run test suites in JUnit. Test suites allow you to group multiple test classes and run them together. This is particularly useful for organizing and managing large test sets. By the end of this section, you will understand how to create and run test suites effectively.

Key Concepts

Test Suite: A collection of test cases that can be executed together.
JUnit Platform Suite: A feature in JUnit 5 that allows you to run multiple test classes together.
Annotations: Special markers in the code that indicate how the test suite should be run.

Creating a Test Suite

To create a test suite in JUnit 5, you use the @Suite annotation along with @SelectClasses or @SelectPackages to specify which test classes or packages to include in the suite.

Example: Creating a Test Suite

Let's create a simple test suite that includes two test classes: TestClass1 and TestClass2.

import org.junit.platform.suite.api.SelectClasses;
import org.junit.platform.suite.api.Suite;

@Suite
@SelectClasses({TestClass1.class, TestClass2.class})
public class MyTestSuite {
}

Explanation

@Suite: Marks the class as a test suite.
@SelectClasses: Specifies the test classes to include in the suite.

Running the Test Suite

You can run the test suite just like any other JUnit test class. Most IDEs (like IntelliJ IDEA, Eclipse) and build tools (like Maven, Gradle) support running test suites directly.

Running in an IDE

IntelliJ IDEA:
- Right-click on the test suite class (MyTestSuite).
- Select "Run 'MyTestSuite'".
Eclipse:
- Right-click on the test suite class (MyTestSuite).
- Select "Run As" > "JUnit Test".

Running with Maven

To run the test suite using Maven, you can configure the maven-surefire-plugin in your pom.xml file.

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.22.2</version>
            <configuration>
                <includes>
                    <include>**/MyTestSuite.java</include>
                </includes>
            </configuration>
        </plugin>
    </plugins>
</build>

Then, run the following command:

mvn test

Running with Gradle

To run the test suite using Gradle, you can configure the test task in your build.gradle file.

test {
    include '**/MyTestSuite.class'
}

Then, run the following command:

gradle test

Practical Exercise

Exercise: Create and Run a Test Suite

Create two simple test classes, TestClass1 and TestClass2, each containing a single test method.
Create a test suite class named MyTestSuite that includes both test classes.
Run the test suite using your preferred method (IDE, Maven, or Gradle).

Solution

TestClass1.java

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class TestClass1 {
    @Test
    void testMethod1() {
        assertTrue(true);
    }
}

TestClass2.java

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class TestClass2 {
    @Test
    void testMethod2() {
        assertTrue(true);
    }
}

MyTestSuite.java

import org.junit.platform.suite.api.SelectClasses;
import org.junit.platform.suite.api.Suite;

@Suite
@SelectClasses({TestClass1.class, TestClass2.class})
public class MyTestSuite {
}

Running the Test Suite

In an IDE: Right-click on MyTestSuite and select "Run".
With Maven: Ensure your pom.xml is configured and run mvn test.
With Gradle: Ensure your build.gradle is configured and run gradle test.

Common Mistakes and Tips

Including Non-Test Classes: Ensure that only test classes are included in the suite.
Incorrect Annotations: Double-check that you are using @Suite and @SelectClasses correctly.
IDE Configuration: Make sure your IDE is properly configured to recognize and run JUnit 5 tests.

Conclusion

In this section, we learned how to create and run test suites in JUnit. Test suites are a powerful way to organize and manage your tests, especially as your test suite grows. By grouping related tests together, you can run them more efficiently and ensure that your code is thoroughly tested. In the next module, we will explore mocking with JUnit, which allows you to create mock objects for more effective unit testing.

Running Test Suites

Key Concepts

Creating a Test Suite

Example: Creating a Test Suite

Explanation

Running the Test Suite

Running in an IDE

Running with Maven

Running with Gradle

Practical Exercise

Exercise: Create and Run a Test Suite

Solution

Running the Test Suite

Common Mistakes and Tips

Conclusion

JUnit Course

Module 1: Introduction to JUnit

Module 2: Basic JUnit Annotations

Module 3: Assertions in JUnit

Module 4: Parameterized Tests

Module 5: Test Suites

Module 6: Mocking with JUnit

Module 7: Advanced JUnit Features

Module 8: Best Practices and Tips

Module 9: JUnit 5 New Features