reflection works too

fda-container-managing-service/services/src/test/java/at/tuwien/mapper/BaseMappingTest.java

 package at.tuwien.mapper;
 
+import at.tuwien.entities.DatabaseContainer;
+import com.github.dockerjava.api.command.InspectContainerResponse;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 @ExtendWith(SpringExtension.class)
 public class BaseMappingTest {
 
+    private final DatabaseContainerMapper databaseContainerMapper;
+
+    @Autowired
+    public BaseMappingTest(DatabaseContainerMapper databaseContainerMapper) {
+        this.databaseContainerMapper = databaseContainerMapper;
+    }
+
     @Configuration
     @ComponentScan(basePackages = {"at.tuwien.mapper"})
     public static class BaseMappingContext {
     }
 
+    private static final String CONTAINER_ID = "deadbeef";
+
     @Test
-    public void contextLoads() {
-        //
+    public void inspectContainerResponseToDatabaseContainer_succeed() throws NoSuchFieldException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
+        final InspectContainerResponse data = new InspectContainerResponse();
+        final Object instance = data.getClass().getConstructor().newInstance();
+        final Field idField = data.getClass().getDeclaredField("id");
+        idField.setAccessible(true);
+        idField.set(instance, CONTAINER_ID);
+        
+        final InspectContainerResponse mockResponse = (InspectContainerResponse) instance;
+
+        final DatabaseContainer container = databaseContainerMapper.inspectContainerResponseToDatabaseContainer(mockResponse);
+
+        assertEquals(CONTAINER_ID, container.getContainerId());
     }
 
 }

fda-container-managing-service/services/src/test/java/at/tuwien/mapper/MappingTestSuite.java

-package at.tuwien.mapper;
-
-public class MappingTestSuite {
-}