What is the @Suite API in JUnit 6 and how do you group tests into suites?

JUnit 6 provides a @Suite annotation (in junit-platform-suite) for declaratively grouping tests from multiple classes or packages. This replaces JUnit 4's @RunWith(Suite.class) and JUnit Platform Runner (which was removed in JUnit 6).

import org.junit.platform.suite.api.*;

// Basic suite: select specific test classes
@Suite
@SelectClasses({
    OrderServiceTest.class,
    PaymentServiceTest.class,
    InventoryServiceTest.class
})
class SmokeTestSuite {}

// Suite by package (runs all tests in the package)
@Suite
@SelectPackages({"com.example.unit", "com.example.integration"})
class AllTestsSuite {}

// Suite with tag filtering
@Suite
@SelectPackages("com.example")
@IncludeTags("fast")
@ExcludeTags({"slow", "integration"})
class FastTestSuite {}

// Suite with class name pattern
@Suite
@SelectPackages("com.example")
@IncludeClassNamePatterns(".*IT")   // only classes ending in IT
class IntegrationTestSuite {}

// Maven: run suites explicitly
// <configuration>
//   <includes>
//     <include>**/*Suite.class</include>
//   </includes>
// </configuration>

Important: suite classes themselves contain no test methods. They are purely declarative configuration classes. The @Suite annotation is a signal to the JUnit Platform to aggregate and run the selected tests.

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