assertTrue(table.removeColumn(c1));
assertTrue(!table.isNameTaken("c1"));
assertNull(table.getColumn("c1"));
// foreign key testing
ForeignKey fk = table.addForeignKey("fk");
assertTrue(_schema.getSchemaGroup().isNameTaken("fk"));
assertTrue(!table.isNameTaken("fk"));
assertEquals(table, fk.getTable());
ForeignKey[] fks = table.getForeignKeys();
assertEquals(1, fks.length);