doInJPA( this::entityManagerFactory, entityManager -> {
	TestEntity e = new TestEntity( 1 );
	e.setEmbs1( new HashMap<>() );
	e.getEmbs1().put( "a", new Emb( "value1" ) );
	e.getEmbs1().put( "b", new Emb( "value2" ) );
	entityManager.persist( e );
} );

doInJPA( this::entityManagerFactory, entityManager -> {
	TestEntity e = entityManager.find( TestEntity.class, 1 );
	e.getEmbs1().put( "a", new Emb( "value3" ) );
} );

@Test
public void testRevisionHistory1() {
	TestEntity e = getAuditReader().find( TestEntity.class, 1, 1 );
	assertEquals( 2, e.getEmbs1().size() );
	assertEquals( "value1", e.getEmbs1().get( "a" ).getValue() );
	assertEquals( "value2", e.getEmbs1().get( "b" ).getValue() );
}

@Test
public void testRevisionHistory2() {
	TestEntity e = getAuditReader().find( TestEntity.class, 1, 2 );
	assertEquals( 2, e.getEmbs1().size() );
	assertEquals( "value3", e.getEmbs1().get( "a" ).getValue() );
	assertEquals( "value2", e.getEmbs1().get( "b" ).getValue() );
}