SortedSet<SqlGenerator> generators = new TreeSet<SqlGenerator>(new SqlGeneratorComparator());
generators.add(new MockSqlGenerator(2, "B1", "B2"));
generators.add(new MockSqlGenerator(1, "A1", "A2").addValidationError("E1"));
SqlGeneratorChain chain = new SqlGeneratorChain(generators);
ValidationErrors validationErrors = chain.validate(new MockSqlStatement(), new MockDatabase());
assertTrue(validationErrors.hasErrors());
}