TYPO3 Core

Travis gives the following message

There was 1 error:

1) TYPO3\CMS\Extensionmanager\Tests\Unit\Service\ExtensionManagementServiceTest::installDependenciesCallsInstall

Invalid argument supplied for foreach()

/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Classes/Package/Packaganager.php:634
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Classes/Package/Packaganager.php:692
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Classes/Package/Packaganager.php:719
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Classes/Package/Packaganager.php:776
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Resources/PHP/TYPO3.Flow/Classes/TYPO3/Flow/Package/Packaganager.php:914
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/core/Classes/Package/Packaganager.php:316
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/extbase/Classes/SignalSlot/Dispatcher.php:150
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/extensionmanager/Classes/Service/ExtensionManagementService.php:266
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/extensionmanager/Classes/Service/ExtensionManagementService.php:198
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/extensionmanager/Tests/Unit/Service/ExtensionManagementServiceTest.php:218
/home/travis/build/TYPO3/TYPO3.CMS/typo3/sysext/extbase/Tests/Unit/BaseTestCase.php:49
/home/travis/build/TYPO3/TYPO3.CMS/typo3conf/ext/phpunit/Composer/vendor/phpunit/phpunit/composer/bin/phpunit:63

The unittests should never reach the PackageManager here, this is out of scope. The reason is that signals are trigger in emitWillInstallExtensions().
Prevent the signals by mocking the method.