https://github.com/rails/sprockets/commit/39490de3bdda3cb0b3aed16544b38b3771fbcca7

From 39490de3bdda3cb0b3aed16544b38b3771fbcca7 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Mon, 19 Dec 2022 21:16:29 +0100
Subject: [PATCH] Make the URI tests pass with ruby-head

* host is "" instead of nil, following the upstream change:
  https://github.com/ruby/uri/commit/81263c9e94bd67ca01deee238842a88c2c8885f3

--- a/lib/sprockets/uri_utils.rb
+++ b/lib/sprockets/uri_utils.rb
@@ -50,7 +50,7 @@ module Sprockets
       # Hack for parsing Windows "file:///C:/Users/IEUser" paths
       path.gsub!(/^\/([a-zA-Z]:)/, '\1'.freeze)
 
-      [scheme, host, path, query]
+      [scheme, host || '', path, query]
     end
 
     # Internal: Join file: URI component parts into String.
--- a/test/test_uri_utils.rb
+++ b/test/test_uri_utils.rb
@@ -38,22 +38,22 @@ class TestURIUtils < MiniTest::Test
     assert_equal ['file', 'localhost', '/etc/fstab', nil], parts
 
     parts = split_file_uri("file:///etc/fstab")
-    assert_equal ['file', nil, '/etc/fstab', nil], parts
+    assert_equal ['file', '', '/etc/fstab', nil], parts
 
     parts = split_file_uri("file:///usr/local/bin/ruby%20on%20rails")
-    assert_equal ['file', nil, '/usr/local/bin/ruby on rails', nil], parts
+    assert_equal ['file', '', '/usr/local/bin/ruby on rails', nil], parts
 
     parts = split_file_uri("file:///usr/local/var/github/app/assets/javascripts/application.js")
-    assert_equal ['file', nil, '/usr/local/var/github/app/assets/javascripts/application.js', nil], parts
+    assert_equal ['file', '', '/usr/local/var/github/app/assets/javascripts/application.js', nil], parts
 
     parts = split_file_uri("file:///C:/Documents%20and%20Settings/davris/FileSchemeURIs.doc")
-    assert_equal ['file', nil, 'C:/Documents and Settings/davris/FileSchemeURIs.doc', nil], parts
+    assert_equal ['file', '', 'C:/Documents and Settings/davris/FileSchemeURIs.doc', nil], parts
 
     parts = split_file_uri("file:///D:/Program%20Files/Viewer/startup.htm")
-    assert_equal ['file', nil, 'D:/Program Files/Viewer/startup.htm', nil], parts
+    assert_equal ['file', '', 'D:/Program Files/Viewer/startup.htm', nil], parts
 
     parts = split_file_uri("file:///C:/Program%20Files/Music/Web%20Sys/main.html?REQUEST=RADIO")
-    assert_equal ['file', nil, 'C:/Program Files/Music/Web Sys/main.html', 'REQUEST=RADIO'], parts
+    assert_equal ['file', '', 'C:/Program Files/Music/Web Sys/main.html', 'REQUEST=RADIO'], parts
   end
 
   def test_join_uri_path
@@ -61,10 +61,10 @@ class TestURIUtils < MiniTest::Test
       join_file_uri('file', 'localhost', '/etc/fstab', nil)
 
     assert_equal "file:///etc/fstab",
-      join_file_uri('file', nil, '/etc/fstab', nil)
+      join_file_uri('file', '', '/etc/fstab', nil)
 
     assert_equal "file:///usr/local/bin/ruby%20on%20rails",
-      join_file_uri('file', nil, '/usr/local/bin/ruby on rails', nil)
+      join_file_uri('file', '', '/usr/local/bin/ruby on rails', nil)
   end
 
   def test_inverse_file_uri_functions