ArchUnit Layer Test

LayerDependencyRulesTest.java

package de.viadee.architecture.archunit.architecture;

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 = "de.viadee.architecture.archunit",
    importOptions = {
        ImportOption.DoNotIncludeTests.class, 
        ImportOption.DoNotIncludeJars.class,
        ImportOption.DoNotIncludeArchives.class
    })
public class LayerDependencyRulesTest {

  @ArchTest
  public static final ArchRule layer_dependency_rule = layeredArchitecture()
    .layer("Controller").definedBy("..controller..")
    .layer("Service").definedBy("..service..")
    .layer("Adapter").definedBy("..adapter..")

    .whereLayer("Controller").mayNotBeAccessedByAnyLayer()
    .whereLayer("Service").mayOnlyBeAccessedByLayers("Controller")
    .whereLayer("Adapter").mayOnlyBeAccessedByLayers("Service")
    
    .because("Layers must respect a defined dependency hierarchy");
}