diff --git a/hibernate-core/src/test/java/org/hibernate/test/collection/bag/PersistentBagContainsTest.java b/hibernate-core/src/test/java/org/hibernate/test/collection/bag/PersistentBagContainsTest.java
new file mode 100644
index 0000000000..c6cc420bbf
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/test/collection/bag/PersistentBagContainsTest.java
@@ -0,0 +1,167 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.collection.bag;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInHibernate;
+import static org.wildfly.common.Assert.assertTrue;
+
+/**
+ * Tests related to contains operations on a PersistentBag.
+ *
+ * @author Vlad Mihalcea
+ */
+public class PersistentBagContainsTest extends BaseCoreFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class[] {
+			Order.class,
+			Item.class
+		};
+	}
+
+	/**
+	 * This test does not verify how equals is implemented for Bags,
+	 * but rather if the child entity equals and hashCode are used properly for both
+	 * managed and detached entities.
+	 */
+	@Test
+	@TestForIssue( jiraKey = "HHH-5409")
+	public void testContains() {
+		Order _order = doInHibernate( this::sessionFactory, session -> {
+			Order order = new Order();
+			session.persist( order );
+
+			Item item1 = new Item();
+			item1.setName( "i1" );
+			Item item2 = new Item();
+			item2.setName( "i2" );
+			order.addItem( item1 );
+			order.addItem( item2 );
+
+			return order;
+		} );
+
+		doInHibernate( this::sessionFactory, session -> {
+			Item item1 = new Item();
+			item1.setName( "i1" );
+
+			Item item2 = new Item();
+			item2.setName( "i2" );
+
+			assertTrue(_order.getItems().contains( item1 ));
+			assertTrue(_order.getItems().contains( item2 ));
+
+			Order order = session.find( Order.class, _order.getId() );
+
+			assertTrue(order.getItems().contains( item1 ));
+			assertTrue(order.getItems().contains( item2 ));
+		} );
+
+		doInHibernate( this::sessionFactory, session -> {
+			Order order = session.find( Order.class, _order.getId() );
+			session.delete( order );
+		} );
+	}
+
+	@Entity(name = "`Order`")
+	public static class Order {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@OneToMany(mappedBy = "order", cascade = CascadeType.ALL, orphanRemoval = true)
+		private List<Item> items = new ArrayList<Item>();
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public List<Item> getItems() {
+			return items;
+		}
+
+		public void addItem(Item item) {
+			items.add( item );
+			item.setOrder( this );
+		}
+	}
+
+	@Entity(name = "Item")
+	public static class Item {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+
+		@ManyToOne
+		private Order order;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Order getOrder() {
+			return order;
+		}
+
+		public void setOrder(Order order) {
+			this.order = order;
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if ( this == o ) {
+				return true;
+			}
+			if ( !( o instanceof Item ) ) {
+				return false;
+			}
+			Item item = (Item) o;
+			return Objects.equals( getName(), item.getName() );
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash( getName() );
+		}
+	}
+
+}