jest-circus allows nested it calls

[runeh]

🐛 Bug Report

jest-circus allows nested test calls.

To Reproduce

Nest one test() inside of another. See https://github.com/runeh/jest-circus-nested-it-repro/blob/master/index.testcase1.test.js

Expected behavior

Tests should not run, and a warning should be shown.

Link to repl or repo (highly encouraged)

https://github.com/runeh/jest-circus-nested-it-repro

envinfo

  System:
    OS: macOS 10.15.4
    CPU: (4) x64 Intel(R) Core(TM) i5-5287U CPU @ 2.90GHz
  Binaries:
    Node: 12.16.1 - ~/.nvm/versions/node/v12.16.1/bin/node
    Yarn: 1.22.4 - ~/.nvm/versions/node/v12.16.1/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.16.1/bin/npm
  npmPackages:
    jest: ^25.3.0 => 25.3.0

[github-actions]

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