diff --git a/pom.xml b/pom.xml
index 27c0e85..1c5feaa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -137,6 +137,12 @@
             <version>4.11.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+            <version>1.7.1</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>ca.uhn.hapi</groupId>
             <artifactId>hapi-base</artifactId>
diff --git a/src/test/java/DNPM/security/SecurityAspectsTest.java b/src/test/java/DNPM/security/SecurityAspectsTest.java
new file mode 100644
index 0000000..8416b8a
--- /dev/null
+++ b/src/test/java/DNPM/security/SecurityAspectsTest.java
@@ -0,0 +1,164 @@
+package DNPM.security;
+
+import de.itc.onkostar.api.IOnkostarApi;
+import de.itc.onkostar.api.Patient;
+import de.itc.onkostar.api.Procedure;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.aop.aspectj.annotation.AspectJProxyFactory;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class SecurityAspectsTest {
+
+    private DummyClass dummyClass;
+
+    private IOnkostarApi onkostarApi;
+
+    private PersonPoolBasedPermissionEvaluator permissionEvaluator;
+
+    @BeforeEach
+    void setup(
+            @Mock IOnkostarApi onkostarApi,
+            @Mock PersonPoolBasedPermissionEvaluator permissionEvaluator
+    ) {
+        this.onkostarApi = onkostarApi;
+        this.permissionEvaluator = permissionEvaluator;
+
+        // Create proxied instance of DummyClass as done within Onkostar using Spring AOP
+        var dummyClass = new DummyClass(onkostarApi);
+        AspectJProxyFactory factory = new AspectJProxyFactory(dummyClass);
+        SecurityAspects securityAspects = new SecurityAspects(this.permissionEvaluator);
+        factory.addAspect(securityAspects);
+        this.dummyClass = factory.getProxy();
+    }
+
+    @Test
+    void testShouldPreventSecuredMethodCallWithPatientParam() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Patient.class), any(PermissionType.class)))
+                .thenReturn(false);
+
+        var exception = assertThrows(
+                Exception.class,
+                () -> this.dummyClass.methodWithPatientParam(new Patient(onkostarApi))
+        );
+        assertThat(exception).isExactlyInstanceOf(IllegalSecuredObjectAccessException.class);
+    }
+
+    @Test
+    void testShouldAllowSecuredMethodCallWithPatientParam() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Patient.class), any(PermissionType.class)))
+                .thenReturn(true);
+
+        this.dummyClass.methodWithPatientParam(new Patient(onkostarApi));
+
+        verify(onkostarApi, times(1)).savePatient(any(Patient.class));
+    }
+
+    @Test
+    void testShouldPreventSecuredMethodCallWithProcedureParam() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Procedure.class), any(PermissionType.class)))
+                .thenReturn(false);
+
+        var exception = assertThrows(
+                Exception.class,
+                () -> this.dummyClass.methodWithProcedureParam(new Procedure(onkostarApi))
+        );
+        assertThat(exception).isExactlyInstanceOf(IllegalSecuredObjectAccessException.class);
+    }
+
+    @Test
+    void testShouldAllowSecuredMethodCallWithProcedureParam() throws Exception {
+        when(this.permissionEvaluator.hasPermission(any(), any(Procedure.class), any(PermissionType.class)))
+                .thenReturn(true);
+
+        this.dummyClass.methodWithProcedureParam(new Procedure(onkostarApi));
+
+        verify(onkostarApi, times(1)).saveProcedure(any(Procedure.class), anyBoolean());
+    }
+
+    @Test
+    void testShouldPreventSecuredMethodCallWithPatientReturnValue() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Patient.class), any(PermissionType.class)))
+                .thenReturn(false);
+
+        var exception = assertThrows(
+                Exception.class,
+                () -> this.dummyClass.methodWithPatientReturnValue(1)
+        );
+        assertThat(exception).isExactlyInstanceOf(IllegalSecuredObjectAccessException.class);
+    }
+
+    @Test
+    void testShouldAllowSecuredMethodCallWithPatientReturnValue() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Patient.class), any(PermissionType.class)))
+                .thenReturn(true);
+
+        var actual = this.dummyClass.methodWithPatientReturnValue(1);
+
+        assertThat(actual).isNotNull();
+    }
+
+    @Test
+    void testShouldPreventSecuredMethodCallWithProcedureReturnValue() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Procedure.class), any(PermissionType.class)))
+                .thenReturn(false);
+
+        var exception = assertThrows(
+                Exception.class,
+                () -> this.dummyClass.methodWithProcedureReturnValue(1)
+        );
+        assertThat(exception).isExactlyInstanceOf(IllegalSecuredObjectAccessException.class);
+    }
+
+    @Test
+    void testShouldAllowSecuredMethodCallWithProcedureReturnValue() {
+        when(this.permissionEvaluator.hasPermission(any(), any(Procedure.class), any(PermissionType.class)))
+                .thenReturn(true);
+
+        var actual = this.dummyClass.methodWithProcedureReturnValue(1);
+
+        assertThat(actual).isNotNull();
+    }
+
+}
+
+class DummyClass {
+
+    private final IOnkostarApi onkostarApi;
+
+    DummyClass(final IOnkostarApi onkostarApi) {
+        this.onkostarApi = onkostarApi;
+    }
+
+    @PersonPoolSecured
+    public void methodWithPatientParam(Patient patient) {
+            this.onkostarApi.savePatient(patient);
+    }
+
+    @PersonPoolSecured
+    public void methodWithProcedureParam(Procedure procedure) throws Exception {
+        this.onkostarApi.saveProcedure(procedure, false);
+    }
+
+    @PersonPoolSecuredResult
+    public Patient methodWithPatientReturnValue(int id) {
+        var patient = new Patient(this.onkostarApi);
+        patient.setId(id);
+        return patient;
+    }
+
+    @PersonPoolSecuredResult
+    public Procedure methodWithProcedureReturnValue(int id) {
+        var procedure = new Procedure(this.onkostarApi);
+        procedure.setId(id);
+        return procedure;
+    }
+}