No tests found, exiting with code 1 when running `yarn test`

[matthieuauger]

Description

When I run yarn test inside Gatsby repository and after having bootstrapped the project, I see the "No tests found, exiting with code 1" issue.

Steps to reproduce

• create a folder www
• clone Gatsby inside it
• install & bootstrap Gatsby
• run yarn test

Expected result

Tests should be run correctly

Environment

System:
OS: macOS 10.14.6
CPU: (8) x64 Intel(R) Core(TM) i7-8559U CPU @ 2.70GHz
Shell: 5.3 - /bin/zsh
Binaries:
Node: 10.7.0 - ~/.nvm/versions/node/v10.7.0/bin/node
Yarn: 1.16.0 - ~/.nvm/versions/node/v10.7.0/bin/yarn
npm: 6.7.0 - ~/.nvm/versions/node/v10.7.0/bin/npm
Languages:
Python: 2.7.10 - /usr/bin/python
Browsers:
Chrome: 75.0.3770.100
Firefox: 67.0.3
Safari: 12.1.2
npmGlobalPackages:
gatsby-cli: 2.4.8

[matthieuauger]

After investigation, this is linked to the testPathIgnorePatternsoption of Jest which is excluding full path of the files, so while my projects are in a www/ folder, they are all ignored

jestjs/jest#1047

I'm submitting a fix for this, there is a documentation about this on Jest doc