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

Currently, the all the schematics use .spec.{ts,js} as a suffix for the test files.

Expected behavior

There is a configuration option (probably threaded through the cli from .nestcli.json to switch the test suffix from .spec.{ts,js} to .test.{ts,js}.

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

It's pretty common practice to give test files the suffix .test.{ts,js} (in fact, the tests for this very project itself follow that pattern). Could we add an option to make this configurable?