Neos\Flow\Package\PackageManager::deletePackage PHP Method

    public function deletePackage($packageKey)
    {
        if (!$this->isPackageAvailable($packageKey)) {
            throw new Exception\UnknownPackageException('Package "' . $packageKey . '" is not available and cannot be removed.', 1166543253);
        }
        $package = $this->getPackage($packageKey);
        if ($package->isProtected()) {
            throw new Exception\ProtectedPackageKeyException('The package "' . $packageKey . '" is protected and cannot be removed.', 1220722120);
        }
        $packagePath = $package->getPackagePath();
        if ($this->isPackageActive($packageKey)) {
            $this->deactivatePackage($packageKey);
            $packagePath = Files::concatenatePaths([$this->packagesBasePath, $this->buildInactivePackageRelativePath($packagePath)]);
        }
        $this->unregisterPackage($package);
        try {
            Files::removeDirectoryRecursively($packagePath);
        } catch (UtilityException $exception) {
            throw new Exception('Please check file permissions. The directory "' . $packagePath . '" for package "' . $packageKey . '" could not be removed.', 1301491089, $exception);
        }
    }

 /**
  * @test
  */
 public function deletePackageRemovesPackageFromAvailableAndActivePackagesAndDeletesThePackageDirectory()
 {
     $package = $this->packageManager->createPackage('Acme.YetAnotherTestPackage');
     $packagePath = $package->getPackagePath();
     $this->assertTrue(is_dir($packagePath . PackageInterface::DIRECTORY_CONFIGURATION), 'The package configuration directory does not exist.');
     $this->assertTrue($this->packageManager->isPackageActive('Acme.YetAnotherTestPackage'), 'The package is not active.');
     $this->assertTrue($this->packageManager->isPackageAvailable('Acme.YetAnotherTestPackage'), 'The package is not available.');
     $this->packageManager->deletePackage('Acme.YetAnotherTestPackage');
     $this->assertFalse(is_dir($packagePath . PackageInterface::DIRECTORY_CONFIGURATION), 'The package configuration directory does still exist.');
     $this->assertFalse($this->packageManager->isPackageActive('Acme.YetAnotherTestPackage'), 'The package is still active.');
     $this->assertFalse($this->packageManager->isPackageAvailable('Acme.YetAnotherTestPackage'), 'The package is still available.');
 }