Adding ArchUnit in the project

core/pom.xml

@@ -36,6 +36,19 @@
       <scope>provided</scope>
     </dependency>
 
+    <dependency>
+      <groupId>com.tngtech.archunit</groupId>
+      <artifactId>archunit-junit5</artifactId>
+      <version>0.14.1</version>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+
   </dependencies>
 
   <build>
@@ -84,5 +97,4 @@
       </plugin>
     </plugins>
   </build>
-
-</project>
+</project>

core/src/main/java/br/com/ricas/RicasFinancasApplication.java

@@ -1,5 +1,6 @@
 package br.com.ricas;
 
+import br.com.ricas.model.Finance;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 

core/src/main/java/br/com/ricas/model/Category.java

@@ -1,4 +1,4 @@
-package br.com.ricas.domain;
+package br.com.ricas.model;
 
 import lombok.Getter;
 import lombok.NoArgsConstructor;

core/src/main/java/br/com/ricas/model/Finance.java

@@ -1,4 +1,4 @@
-package br.com.ricas.domain;
+package br.com.ricas.model;
 
 import br.com.ricas.FinanceType;
 import lombok.Getter;

core/src/test/java/br/com/ricas/archunit/CleanArchRuleDefinition.java

@@ -0,0 +1,24 @@
+package br.com.ricas.archunit;
+
+import com.tngtech.archunit.core.domain.JavaClasses;
+import com.tngtech.archunit.core.importer.ClassFileImporter;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.lang.ArchRule;
+import org.junit.jupiter.api.Test;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes;
+
+@AnalyzeClasses(packages = "br.com.ricas")
+class CleanArchRuleDefinition {
+
+    @Test
+    public void model_should_only_be_accessed_by_model() {
+        JavaClasses importedClasses = new ClassFileImporter().importPackages("br.com.ricas");
+
+        ArchRule myRule = classes()
+                .that().resideInAPackage("br.com.ricas.model..")
+                .should().onlyBeAccessed().byAnyPackage("br.com.ricas.model..");
+
+        myRule.check(importedClasses);
+    }
+}

core/src/test/java/br/com/ricas/domain/CategoryTests.java → core/src/test/java/br/com/ricas/model/CategoryTests.java

@@ -1,4 +1,4 @@
-package br.com.ricas.domain;
+package br.com.ricas.model;
 
 import org.junit.jupiter.api.Test;
 

core/src/test/java/br/com/ricas/domain/FinanceTests.java → core/src/test/java/br/com/ricas/model/FinanceTests.java

@@ -1,4 +1,4 @@
-package br.com.ricas.domain;
+package br.com.ricas.model;
 
 import br.com.ricas.FinanceType;
 import br.com.ricas.RicasFinancasApplication;