Refs #15316. Fix unit test.

extension/Tests/Unit/Core/Store/StoreTest.php

@@ -475,7 +475,10 @@ class StoreTest extends TestCase {
         }
 
         # Depends where the unit test runs
-        unset($config[SYSTEM_BASE_URL]);
+        if (false !== strpos($config[SYSTEM_BASE_URL], FAILED_TO_SET_BASE_URL) || false !== strpos($config[SYSTEM_BASE_URL], 'example.com')) {
+            $expect[SYSTEM_BASE_URL] = $config[SYSTEM_BASE_URL];
+            $expect[SYSTEM_BASE_URL_LANG] = $config[SYSTEM_BASE_URL_LANG];
+        }
 
         // check default values
         $this->assertEquals($expect, $config, "Retrieve system store.");