Added test that fails when multiple remove(i)s are applied.

hibernate-reactive-core/src/test/java/org/hibernate/reactive/OrderedEmbeddableCollectionTest.java

@@ -147,6 +147,58 @@ public void test(TestContext context) {
         );
     }
 
+    @Test
+    public void testFailOnMultipleRemoves(TestContext context) {
+        Book book1 = new Book("Feersum Endjinn");
+        Book book2 = new Book("Use of Weapons");
+        Book book3 = new Book( "Third Book");
+        Book book4 = new Book( "Fourth Book");
+        Book book5 = new Book( "Fifth Book");
+        Author author = new Author("Iain M Banks");
+        author.books.add(book1);
+        author.books.add(book2);  // << remove(1)
+        author.books.add(book3);  // << remove(2)
+        author.books.add(book4);
+        author.books.add(book5);
+
+        test(context,
+             getMutinySessionFactory()
+                     .withTransaction( (session, transaction) -> session.persistAll(author) )
+                     .chain( () -> getMutinySessionFactory()
+                             .withTransaction( (session, transaction) -> session.find(Author.class, author.id)
+                                     .invoke( a -> context.assertFalse( Hibernate.isInitialized(a.books) ) )
+                                     .chain( a -> session.fetch(a.books) )
+                                     .invoke( books -> context.assertEquals( 5, books.size() ) )
+                             )
+                     )
+                     .chain( () -> getMutinySessionFactory()
+                             .withTransaction( (session, transaction) -> session.createQuery("select distinct a from Author a left join fetch a.books", Author.class )
+                                     .getSingleResult()
+                                     .invoke( a -> context.assertTrue( Hibernate.isInitialized(a.books) ) )
+                                     .invoke( a -> context.assertEquals( 5, a.books.size() ) )
+                             )
+                     )
+                     .chain( () -> getMutinySessionFactory()
+                             .withTransaction( (session, transaction) -> session.find(Author.class, author.id)
+                                     .chain( a -> session.fetch(a.books) )
+                                     .invoke( books -> {
+                                         books.remove( 1 );
+                                         books.remove( 1 );
+                                     } )
+                             )
+                     )
+                     .chain( () -> getMutinySessionFactory()
+                             .withTransaction( (session, transaction) -> session.find(Author.class, author.id)
+                                     .chain( a -> session.fetch(a.books) )
+                                     .invoke( books -> {
+                                         context.assertEquals( 3, books.size() );
+                                         context.assertEquals( book3.title, books.get(1).title );
+                                     } )
+                             )
+                     )
+        );
+    }
+
     @Embeddable
     static class Book {
         Book(String title) {