BAEL-4900 AttributeOverwrite explained

persistence-modules/spring-data-jpa-annotations/src/test/java/com/baeldung/attribute/overwrite/AttributeOverwriteIntegrationTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.attribute.overwrite;
+
+import com.baeldung.Application;
+import com.baeldung.attribute.overwrite.entity.Address;
+import com.baeldung.attribute.overwrite.entity.Brand;
+import com.baeldung.attribute.overwrite.entity.Car;
+import com.baeldung.attribute.overwrite.repository.CarRepository;
+import org.assertj.core.api.Assertions;
+import org.jetbrains.annotations.NotNull;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDate;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = {Application.class})
+public class AttributeOverwriteIntegrationTest {
+
+    private static final LocalDate FORD_FOUNDATION_DATE = LocalDate.parse("1903-06-16");
+    @Autowired
+    CarRepository carRepository;
+
+    @Test
+    @Transactional
+    public void whenInsertingCar_thenEmbeddedAndMappedFieldsArePopulated() {
+
+        Car fordMustang = createMustang();
+
+        carRepository.save(fordMustang);
+        Car actualCar = carRepository.getOne(fordMustang.getId());
+
+        Assertions.assertThat(actualCar).isEqualTo(fordMustang);
+    }
+
+    @NotNull
+    private Car createMustang() {
+        Address address = new Address();
+        address.setName("Ford United States");
+        address.setCity("Dearborn");
+
+        Brand ford = new Brand();
+        ford.setName("Ford");
+        ford.setFoundationDate(FORD_FOUNDATION_DATE);
+
+        Car fordMustang = new Car();
+        fordMustang.setIdentifier("WP1AB29P88LA47599");
+        fordMustang.setModel("Ford");
+        fordMustang.setName("My car");
+        fordMustang.setBrand(ford);
+        return fordMustang;
+    }
+}