diff --git a/tests/system/HTTP/SiteURITest.php b/tests/system/HTTP/SiteURITest.php
index c9423b6d1da3..f2b665b94a38 100644
--- a/tests/system/HTTP/SiteURITest.php
+++ b/tests/system/HTTP/SiteURITest.php
@@ -127,6 +127,42 @@ public function provideURIs()
                 ['one', 'two'],
                 2,
             ],
+            '//one/two' => [
+                'http://example.com/',
+                'index.php',
+                '//one/two',
+                'http://example.com/index.php/one/two',
+                'one/two',
+                '/index.php/one/two',
+                '',
+                '',
+                ['one', 'two'],
+                2,
+            ],
+            'one/two//' => [
+                'http://example.com/',
+                'index.php',
+                'one/two//',
+                'http://example.com/index.php/one/two/',
+                'one/two/',
+                '/index.php/one/two/',
+                '',
+                '',
+                ['one', 'two'],
+                2,
+            ],
+            '///one///two///' => [
+                'http://example.com/',
+                'index.php',
+                '///one///two///',
+                'http://example.com/index.php/one/two/',
+                'one/two/',
+                '/index.php/one/two/',
+                '',
+                '',
+                ['one', 'two'],
+                2,
+            ],
             'Subfolder: ' => [
                 'http://example.com/ci4/',
                 'index.php',