@Override
    public String select(List<String> columns, List<String> where) {
        StringBuilder sql = new StringBuilder();
        String method = "SELECT ";
        sql.append(method);
        for (int i = 0; i < columns.size(); i++) {
            sql.append(columns.get(i));
            if (i == columns.size() - 1) {
                sql.append(" ");
            } else {
                sql.append(",");
            }
        }
        sql.append("FROM ");
        sql.append(getTableName());
        sql.append(" ");

        if (CollectionUtils.isEmpty(where)) {
            return sql.toString();
        }

        appendWhereClause(where, sql);
        return sql.toString();
    }
@Test
    void testSelectAll() {
        String sql = abstractMapper.select(Arrays.asList("id", "name"), null);
        assertEquals("SELECT id,name FROM tenant_info ", sql);
    }