Coverage in Watch mode only for tested files

[eddiemonge]

When running Jest in watch mode, coverage should only be collected for the files that have been tested. This will speed it up considerably.

I am asking for this feature because when I am unit testing a single file, I also want to see the coverage to see if i missed anything. I don't want to have to wait for untested files to have coverage ran on them, which will result in 0 most times anway.

[jaredtmartin]

This would be awesome and would fundamentally change how I test.

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