Revert "Simplify"

This reverts commit 9d4496c.

Author: sebastianbergmann

src/Report/Xml/Facade.php

@@ -10,6 +10,7 @@
 namespace SebastianBergmann\CodeCoverage\Report\Xml;
 
 use const DIRECTORY_SEPARATOR;
+use function assert;
 use function count;
 use function dirname;
 use function file_get_contents;
@@ -90,11 +91,14 @@ private function setBuildInformation(CodeCoverage $coverage): void
         if ($coverage->driverIsPcov()) {
             $driverExtensionName    = 'pcov';
             $driverExtensionVersion = phpversion('pcov');
-        } else {
+        } elseif ($coverage->driverIsXdebug()) {
             $driverExtensionName    = 'xdebug';
             $driverExtensionVersion = phpversion('xdebug');
         }
 
+        assert(isset($driverExtensionName));
+        assert(isset($driverExtensionVersion));
+
         $this->project->buildInformation(
             new Runtime,
             new DateTimeImmutable,