ConfigurationTest fails when installing via composer

[barbazul]

An integration test is failing when Magento is built via composer (not when clones from github).

The problem seems to be that basePath is calculated as the app directory but the actual code is in vendor so XML configuration is not found and an uncatched exception is thrown at

magento2/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php

Line 87 in 276c690

$content = $this->appDir->readFile($this->appDir->getRelativePath($file->getFullPath()));

Preconditions

1. Build magento via command line as instructed in the devdocs
2. Set up integration tests as instructed in the devdocs

Steps to reproduce

1. php vendor/bin/phpunit -c dev/tests/integration --filter ConfigurationTest

Expected result

1. Test passes

Actual result

PHPUnit 6.2.4 by Sebastian Bergmann and contributors.

E                                                                   1 / 1 (100%)

Time: 5.17 seconds, Memory: 218.59MB

There was 1 error:

1) Magento\Ui\Component\ConfigurationTest::testConfiguration
Magento\Framework\Exception\FileSystemException: Cannot read contents from file "/var/www/html/app/var/www/html/vendor/magento/module-email/view/adminhtml/ui_component/design_config_form.xml"

/var/www/html/vendor/magento/framework/Filesystem/Driver/File.php:149
/var/www/html/vendor/magento/framework/Filesystem/Directory/Read.php:214
/var/www/html/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php:87
/var/www/html/vendor/phpunit/phpunit/phpunit:53

ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

=== Memory Usage System Stats ===
Memory usage (OS):      245.58M (113.69% of 216.00M reported by PHP)
Estimated memory leak:  29.58M (12.04% of used memory)

[magento-engcom-team]

@barbazul, thank you for your report.
We've created internal ticket(s) MAGETWO-85719 to track progress on the issue.

[okorshenko]

Hi @barbazul. Thank you for your report.
The issue has been fixed in magento-engcom/magento2ce#1161 by @nmalevanec in 2.2-develop branch
Related commit(s):

• 29e3f33

The fix will be available with the upcoming 2.2.4 release.