https://git.ruby-lang.org/ruby.git/commit/?id=71b937d3d7

From 71b937d3d7f1369a55844201f31720e815d0168c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Sat, 21 Aug 2021 16:52:48 +0200
Subject: [rubygems/rubygems] Normalize setting `GEM_PATH`

https://github.com/rubygems/rubygems/commit/4188ebd568
---
 lib/bundler.rb                       | 4 ++--
 spec/bundler/bundler/bundler_spec.rb | 6 ++----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/lib/bundler.rb b/lib/bundler.rb
index 47f1fd2..52e80c4 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -661,12 +661,12 @@ EOF https://github.com/ruby/ruby/blob/trunk/lib/bundler.rb#L661
       configure_gem_home
     end
 
-    def configure_gem_path(env = ENV)
+    def configure_gem_path
       unless use_system_gems?
         # this needs to be empty string to cause
         # PathSupport.split_gem_path to only load up the
         # Bundler --path setting as the GEM_PATH.
-        env["GEM_PATH"] = ""
+        Bundler::SharedHelpers.set_env "GEM_PATH", ""
       end
     end
 
diff --git a/spec/bundler/bundler/bundler_spec.rb b/spec/bundler/bundler/bundler_spec.rb
index d164b5d..b8191fe 100644
--- a/spec/bundler/bundler/bundler_spec.rb
+++ b/spec/bundler/bundler/bundler_spec.rb
@@ -176,11 +176,9 @@ RSpec.describe Bundler do https://github.com/ruby/ruby/blob/trunk/spec/bundler/bundler/bundler_spec.rb#L176
   describe "configuration" do
     context "disable_shared_gems" do
       it "should unset GEM_PATH with empty string" do
-        env = {}
         expect(Bundler).to receive(:use_system_gems?).and_return(false)
-        Bundler.send(:configure_gem_path, env)
-        expect(env.keys).to include("GEM_PATH")
-        expect(env["GEM_PATH"]).to eq ""
+        Bundler.send(:configure_gem_path)
+        expect(ENV["GEM_PATH"]).to eq ""
       end
     end
   end
-- 
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