test: add xml file

_fixtures/sql/BookMapper.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.phodal.pholedge.mapper.BookMapper">
+    <select id="doSave" parameterType="com.phodal.pholedge.book.model.Book">
+        INSERT INTO book (id, isbn, name, createdAt) VALUES (#{id}, #{isbn}, #{name}, #{createdAt}) ON DUPLICATE KEY UPDATE isbn=#{isbn}, name=#{name}
+    </select>
+    <select id="list" resultType="com.phodal.pholedge.book.model.BookRepresentaion">
+        select * from book order by id
+    </select>
+    <select id="byId" resultType="com.phodal.pholedge.book.model.Book">
+        select * from book where id = #{id}
+    </select>
+</mapper>
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