Layer architecture

LayeredArchitectureTest.java

import static com.tngtech.archunit.library.Architectures.layeredArchitecture;

import com.tngtech.archunit.core.importer.ImportOption;
import com.tngtech.archunit.junit.AnalyzeClasses;
import com.tngtech.archunit.junit.ArchTest;
import com.tngtech.archunit.lang.ArchRule;

@AnalyzeClasses(packages = "com.example.archunit", importOptions = ImportOption.DoNotIncludeTests.class)
class LayeredArchitectureTest {

    private static final String CONTROLLER = "Controller";
    private static final String REPOSITORY = "Repository";
    private static final String SERVICE = "Service";

    @ArchTest
    static final ArchRule layer_dependencies_are_respected = layeredArchitecture()
       .layer(CONTROLLER).definedBy("..controller..")
       .layer(SERVICE).definedBy("..service..")
       .layer(REPOSITORY).definedBy("..repository..")
       .whereLayer("Controllers").mayNotBeAccessedByAnyLayer()
       .whereLayer(SERVICE).mayOnlyBeAccessedByLayers(CONTROLLER)
       .whereLayer(REPOSITORY).mayOnlyBeAccessedByLayers(SERVICE);
}