Results 3 issues of goodstemy

# Describe the bug Trying to write tests based on [this](https://gist.github.com/navjotahuja92/f51601b17fb248cf4727b5650d945607) example using `createTypeormDataSource`. ``` FAIL src/controllers/order/order.service.spec.ts Order module ✕ Should work ● Order module › Should work TypeError: DataSource...

# Describe the bug I'm using nest.js + typeorm. Based on [this](https://github.com/oguimbal/pg-mem/blob/master/samples/typeorm/simple.ts) example I tried to create test with pg-mem. ``` FAIL src/controllers/order/order.service.spec.ts Order module ✕ Should work (1 ms)...

Can worker block received messages until one of message will be executed by calling `next()` ?