Configuration loading of single project does not work

[eclewlow]

🐛 Bug Report

When projects is set to a single project, the configuration for the project will not load.
However, when projects is set to multiple projects, the configuration will load.

To Reproduce

#  In <rootDir>/jest.config.js
{
     projects: ["<rootDir>/project1/"]
}

# running jest
jest --showConfig

# configuration at    <rootDir>/project1/jest.config.js   **will not** load

However

#  In <rootDir>/jest.config.js
{
     projects: [
            "<rootDir>/project1/",
            "<rootDir>/project2/"
     ]
}
# both configurations at
#    <rootDir>/project1/jest.config.js
#    and   <rootDir>/project2/jest.config.js   **will** load

Expected behavior

Configuration loading works even if projects is set to only a single project

  System:
    OS: macOS High Sierra 10.13.4
    CPU: x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
  Binaries:
    Node: 10.1.0 - /usr/local/bin/node
    Yarn: 1.6.0 - /usr/local/bin/yarn
    npm: 6.0.1 - ~
  npmPackages:
    jest: ^22.4.3 => 22.4.3

[danvc]

Is it already released?

[yozlet]

This might be the same issue as #5866.

[SimenB]

Yeah dupe of #5866, thanks!

[github-actions]

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