test(architecture): add archunit tests to enforce the following of clean architecture principles

Author: andrea-acampora

src/test/kotlin/architecture/CleanArchitectureTest.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2023. Smart Operating Block
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package architecture
+
+import com.tngtech.archunit.core.importer.ClassFileImporter
+import com.tngtech.archunit.lang.syntax.ArchRuleDefinition
+import com.tngtech.archunit.library.Architectures.layeredArchitecture
+import io.kotest.core.spec.style.FunSpec
+
+class CleanArchitectureTest : FunSpec({
+
+    test("Domain logic layer should not depend on any other layers") {
+        ArchRuleDefinition
+            .noClasses().that().resideInAPackage("..entities..")
+            .should().dependOnClassesThat().resideInAPackage("..application..")
+            .andShould().dependOnClassesThat().resideInAPackage("..infrastructure..")
+            .check(ClassFileImporter().importPackages("..entities.."))
+    }
+
+    test("Application layer should not depend on Infrastructure layer") {
+        ArchRuleDefinition
+            .noClasses().that().resideInAPackage("..application..")
+            .should().dependOnClassesThat().resideInAPackage("..infrastructure..")
+            .check(ClassFileImporter().importPackages("..application.."))
+    }
+
+    test("The layer of architecture should respect clean architecture principles") {
+        layeredArchitecture()
+            .consideringAllDependencies()
+            .layer("Entity").definedBy("..entities..")
+            .layer("Application").definedBy("..application..")
+            .layer("Infrastructure").definedBy("..infrastructure..")
+            .whereLayer("Application").mayOnlyBeAccessedByLayers("Infrastructure")
+            .whereLayer("Entity").mayNotAccessAnyLayer()
+    }
+})