Coverage always reports summary

[eddiemonge]

🐛 Bug Report

Jest always reports coverage in results, regardless of what reporters are there. Seems to always append text-summary unless text is listed.

A basic summary was added here and then updated here.

I think this line should be coverageReporters.length < 1. That way if someone doesn't specify any reporter than the summary is used.

To Reproduce

Create a config and run it:

module.exports = {
  collectCoverage: true,
  coverageReporters: ['html']
}

Expected behavior

If I only put html in the reporters list, then nothing about coverage should be shown in the terminal

  System:
    OS: macOS High Sierra 10.13.6
    CPU: x64 Intel(R) Core(TM) i5-5350U CPU @ 1.80GHz
  Binaries:
    Node: 10.10.0 - ~/.nvm/versions/node/v10.10.0/bin/node
    npm: 6.4.1 - ~/.nvm/versions/node/v10.10.0/bin/npm
  npmPackages:
    jest: ^23.6.0 => 23.6.0

[SimenB]

Seems like a straight forward fix, wanna send a PR for it?

[github-actions]

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