Drop subprocess regression test for request proxy lookup

Author: afurm

test/rubygems/test_gem_request.rb

@@ -2,7 +2,6 @@
 
 require_relative "helper"
 require "rubygems/request"
-require "open3"
 
 unless Gem::HAVE_OPENSSL
   warn "Skipping Gem::Request tests.  openssl not found."
@@ -190,18 +189,6 @@ def test_get_proxy_from_env_empty
     assert_nil request.proxy_uri
   end
 
-  def test_get_proxy_from_env_when_requiring_request_directly
-    script = <<~RUBY
-      require "rubygems/request"
-      ENV["HTTP_PROXY"] = "fakeurl:12345"
-      Gem::Request.get_proxy_from_env("http")
-    RUBY
-
-    output, status = Open3.capture2e(*ruby_with_rubygems_in_load_path, "-e", script)
-
-    assert status.success?, output
-  end
-
   def test_fetch
     uri = Gem::Uri.new(Gem::URI.parse("#{@gem_repo}/specs.#{Gem.marshal_version}"))
     response = util_stub_net_http(body: :junk, code: 200) do