diff --git a/tests/siteIntallD6Test.php b/tests/siteIntallD6Test.php
index 74e61fc..f677695 100644
--- a/tests/siteIntallD6Test.php
+++ b/tests/siteIntallD6Test.php
@@ -16,6 +16,29 @@ class siteInstallD6Case extends Drush_CommandTestCase {
   }
 
   /*
+   * Test a D6 install without sites-subdir.
+   */
+  public function testSubdirIsRedundant() {
+    // Set up codebase without installing Drupal.
+    $sites = $this->setUpDrupal(1, FALSE, '6');
+    $root = $this->webroot();
+    $site = key($sites);
+
+    $site_name = $this->randomString();
+
+    $this->drush('site-install', array(
+        'default',
+      ),
+      array(
+        'db-url' => $this->db_url($site),
+        'yes' => NULL,
+        'root' => $root,
+        'site-name' => $site_name,
+        'uri' => $site,
+    ));
+  }
+
+  /*
    * Test a D6 install with extra options.
    */
   public function testExtraConfigurationOptions() {