public void testUnchanged() {
// given two identical table versions
Database db1 = new Database("db1", "hsql", "1.5.8", null);
DBCatalog cat1 = new DBCatalog("cat1", db1);
DBSchema schema1 = new DBSchema("public", cat1);
DBTable table1 = createTableWithColumns("tbl", 3);
schema1.addTable(table1);
Database db2 = new Database("db1", "hsql", "1.5.8", null);
DBCatalog cat2 = new DBCatalog("cat2", db2);
DBSchema schema2 = new DBSchema("public", cat2);
DBTable table2 = createTableWithColumns("tbl", 3);
schema2.addTable(table2);
// when comparing the tables
SchemaChange schemaChange = new SchemaComparator(config).compare(db1, db2);