Testing Module should create express server automatically

[xeoneux]

I'm submitting a...

[ ] Regression 
[ ] Bug report
[x] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

TestingModule.createNestApplication function requires an optional express server. It won't create one automatically if not provided.

Expected behavior

TestingModule.createNestApplication function should create an express server automatically if not provided in the parameters.

Minimal reproduction of the problem with instructions

Not required

What is the motivation / use case for changing the behavior?

To abstract away express and its import and provide a default fallback

Environment

Nest version: 4.4.2

 
For Tooling issues:
- Node version: 9.3.0  
- Platform: OS X High Sierra  

Others: N/A

[kamilmysliwiec]

Hi @xeoneux,
I have merged your PR. It'll be a part of 4.5.3 :)

[lock]

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