Test suites in JUnit 5
Test suites are a critical aspect of software testing, allowing developers to group together multiple tests into a single, cohesive unit. JUnit 5 provides support for test suites, making it easy to execute multiple tests in a specific order, with a single command. In this blog, we will discuss what test suites are and how they can be created and executed using JUnit 5.
What is a test suite?
A test suite is a collection of test cases that are grouped together based on a common theme or purpose. Test suites can be used to execute multiple tests in a specific order, or to test different parts of a system together. Test suites are an essential part of the software development process, helping to ensure that all parts of a system are tested thoroughly and that the system is functioning correctly as a whole.
Creating a Test Suite in JUnit 5
In JUnit 5, test suites can be created using the @Suite annotation. The @Suite annotation allows developers to specify the classes that contain the tests to be included in the suite. For example, to create a test suite for a group of test classes, we can create a new test class and annotate it with @Suite, specifying the test classes to include as arguments:
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import org.junit.platform.runner.JUnitPlatform;
import org.junit.platform.suite.api.SelectClasses;
import org.junit.runner.RunWith;
@RunWith(JUnitPlatform.class)
@SelectClasses({TestOne.class, TestTwo.class, TestThree.class})
public class TestSuite {
}
In this example, we have created a new test class called TestSuite that includes the test classes TestOne, TestTwo, and TestThree.
Executing a Test Suite in JUnit 5
Once a test suite has been created, it can be executed using JUnit 5’s test runner. The test runner can be invoked from the command line or integrated into an IDE, build tool, or Continuous Integration/Continuous Delivery (CI/CD) pipeline.
To execute a test suite from the command line, we can use the Console Launcher, which is a command-line tool that provides a simple and easy-to-use interface for running tests and viewing the results. To run a test suite using the Console Launcher, we simply need to specify the name of the test suite class as an argument:
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java -jar junit-platform-console-standalone-1.7.2.jar --class-name="com.example.TestSuite"
This will execute all of the tests in the specified test suite class.
In an IDE such as Eclipse or IntelliJ IDEA, we can simply run the test suite class as we would any other JUnit test class. When we run the test suite class, JUnit 5 will automatically execute all of the tests included in the suite.
Conclusion
Test suites are a critical aspect of software testing, allowing developers to group together multiple tests into a single, cohesive unit. JUnit 5 provides support for test suites, making it easy to execute multiple tests in a specific order, with a single command. By leveraging the capabilities of JUnit 5’s test suites, developers can ensure that their applications are robust, reliable, and easy to maintain.