Added tests

.gitignore

.vscode/settings.json

coverage/base.css

coverage/calculator.js.html

coverage/coverage-final.json

coverage/dao.js.html

coverage/index.html

coverage/persondao.js.html

coverage/prettify.css

coverage/prettify.js

coverage/runsqlfile.js.html

coverage/sort-arrow-sprite.png

coverage/sorter.js

coverage/sum.js.html

dao/create_tables.sql

dao/persondao.js

dao/persondao.test.js

package-lock.json

server.js