I have a custom repository class which inherits from BaseRepository exported in the typeorm-transactional-cls-hooked package which in its turn becomes a plain typeorm Repository.

In my custom repository class I'm trying to mock the create and save methods but the test execution always tries to execute those functions as if it's on a real application environment trying to access a database.

File to be tested:

import { DeepPartial } from 'typeorm'
import { BaseRepository } from 'typeorm-transactional-cls-hooked'

export class TypeOrmBaseRepository<TEntity> extends BaseRepository<TEntity> {
  createAndSave(entity?: DeepPartial<TEntity>): Promise<TEntity> {
    return this.save(entity ? this.create(entity) : this.create())
  }
}

Test:

import { TypeOrmBaseRepository } from '@infrastructure/adapter/persistence/typeorm/repository/TypeOrmBaseRepository'
import { when } from 'ts-mockito'

describe('#TypeOrmBaseRepository', () => {
  let typeOrmBaseRepository: TypeOrmBaseRepository<any>

  beforeEach(() => {
    typeOrmBaseRepository = new TypeOrmBaseRepository()
  })

  it('', () => {
    when(typeOrmBaseRepository.createAndSave()).thenResolve(() => {
      return {
        save: () => 'saved'
      }
    })
    const result = typeOrmBaseRepository.createAndSave()

    console.log('result', result)
  })
})

The error:

ConnectionNotFoundError: Connection "default" was not found.

      at ConnectionNotFoundError.TypeORMError [as constructor] (src/error/TypeORMError.ts:7:9)
      at new ConnectionNotFoundError (src/error/ConnectionNotFoundError.ts:8:9)
      at ConnectionManager.Object.<anonymous>.ConnectionManager.get (src/connection/ConnectionManager.ts:42:19)
      at Object.getManager (src/globals.ts:107:35)
      at Object.<anonymous>.exports.getEntityManagerOrTransactionManager (node_modules/typeorm-transactional-cls-hooked/src/common.ts:25:27)
      at TypeOrmBaseRepository.get (node_modules/typeorm-transactional-cls-hooked/src/patch-typeorm-repository.ts:11:14)
      at TypeOrmBaseRepository.Object.<anonymous>.Repository.create (src/repository/Repository.ts:99:21)
      at TypeOrmBaseRepository.createAndSave (src/infrastructure/adapter/persistence/typeorm/repository/TypeOrmBaseRepository.ts:6:58)
      at Object.<anonymous> (test/unit/infrastructure/adapter/persistence/typeorm/entity/executed-message/repository/TypeOrmBaseRepository.spec.ts:12:32)

How do I mock the typeorm connection or repository for this to work?