How can we organize a full jest testing project with express and typeorm

[tainbgo1]

Issue type:

[x ] question
[ ] bug report
[ ] feature request
[ ] documentation issue

Database system/driver:

[ ] cordova
[ ] mongodb
[ ] mssql
[x ] mysql / mariadb
[ ] oracle
[ ] postgres
[ ] cockroachdb
[ ] sqlite
[ ] sqljs
[ ] react-native
[ ] expo

TypeORM version:

[x ] latest
[ ] @next
[ ] 0.x.x (or put your version here)

I'm adding unit testing by jest for express and typeorm but it's seem many things to handle from mocking server, app and connection from typeorm.
If somebody have already build the example and share it. that would be great.