assertNull(table.getPrimaryKey());
assertTrue(!_schema.getSchemaGroup().isNameTaken("pk"));
// column testing
Column c2 = table.addColumn("c2");
Column c1 = table.addColumn("c1");
assertTrue(table.isNameTaken("c1"));
assertTrue(!_schema.getSchemaGroup().isNameTaken("c1"));
assertEquals(table, c1.getTable());
Column[] cols = table.getColumns();
assertEquals(2, cols.length);