Allow running tests for modules installed in Magento instance via vendor directory.

[lazyguru]

Allow running tests for modules installed in Magento instance via vendor directory.

Preconditions

1. Install Magento 2.2.x or later
2. Install custom module using composer (so module is installed under MAGENTO_BP/vendor
3. Custom module contains tests under Test/Mftf
4. Mftf is installed and configured per DevDocs instructions

Steps to reproduce

1. cd MAGENTO_BP/dev/tests/acceptance
2. vendor/bin/robo generate:tests

Expected result

1. Tests from custom module are generated under MAGENTO_BP/dev/tests/acceptance/tests/functional/Magento/FunctionalTest/_generated/default

Actual result

1. Custom module is completely ignored as MAGENTO_BP/vendor is not parsed as a location for tests. Only the following paths are parsed:
   a. MAGENTO_BP/app/code/
   b. MAGENTO_BP/dev/tests/acceptance/vendor
   c. MAGENTO_BP/dev/tests/acceptance/tests/functional/Magento/FunctionalTest

[lazyguru]

As a workaround, setting CUSTOM_MODULE_PATHS=<MAGENTO_BP>/vendor/<vendor_name>/<module>/Test/Mftf in .env does seem to allow tests to run. However, ideally this should not be needed

[sshrewz]

@lazyguru, thanks for submitting this Github issue. We have created MQE-1124 to track this in our internal ticketing system.

[aljcalandra]

Resolved in /pull/228