Code coverage for selected files

[CyberMew]

🚀 Feature Proposal

To generate a file and/or print to console just for this test file(s).

Motivation

A full test run takes 30 mins, I only require to see code coverage for a particular file which only takes a minute.

Example

Something like jest file [-u] -coverage ?

Pitch

Because it really saves me a lot of time. If everything is shown in the console, it's all good.

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