1 files changed, 13 insertions, 9 deletions
diff --git a/test/rubygems/test_gem_commands_open_command.rb b/test/rubygems/test_gem_commands_open_command.rb
index 2d62149cc4..d9e518048c 100644
--- a/test/rubygems/test_gem_commands_open_command.rb
+++ b/test/rubygems/test_gem_commands_open_command.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
-require_relative 'helper'
-require 'rubygems/commands/open_command'
+
+require_relative "helper"
+require "rubygems/commands/open_command"
 
 class TestGemCommandsOpenCommand < Gem::TestCase
   def setup
@@ -21,20 +22,23 @@ class TestGemCommandsOpenCommand < Gem::TestCase
 
   def test_execute
     @cmd.options[:args] = %w[foo]
-    @cmd.options[:editor] = "#{Gem.ruby} -eexit --"
+    @cmd.options[:editor] = (ruby_with_rubygems_in_load_path + ["-e", "puts(ARGV,Dir.pwd)", "--"]).join(" ")
 
-    gem 'foo', '1.0.0'
-    spec = gem 'foo', '1.0.1'
+    gem "foo", "1.0.0"
+    spec = gem "foo", "1.0.1"
 
     assert_nothing_raised Gem::MockGemUi::TermError do
-      Dir.stub(:chdir, spec.full_gem_path) do
+      stdout, stderr = capture_subprocess_io do
         use_ui @ui do
           @cmd.execute
         end
       end
+      assert_equal [spec.full_gem_path, spec.full_gem_path], stdout.split("\n")
+      assert_equal "", stderr
     end
 
     assert_equal "", @ui.error
+    assert_equal "", @ui.output
   end
 
   def test_wrong_version
@@ -49,7 +53,7 @@ class TestGemCommandsOpenCommand < Gem::TestCase
       end
     end
 
-    assert_match %r{Unable to find gem 'foo'}, @ui.output
+    assert_match(/Unable to find gem 'foo'/, @ui.output)
     assert_equal "", @ui.error
   end
 
@@ -62,7 +66,7 @@ class TestGemCommandsOpenCommand < Gem::TestCase
       end
     end
 
-    assert_match %r{Unable to find gem 'foo'}, @ui.output
+    assert_match(/Unable to find gem 'foo'/, @ui.output)
     assert_equal "", @ui.error
   end
 
@@ -91,7 +95,7 @@ class TestGemCommandsOpenCommand < Gem::TestCase
       end
     end
 
-    assert_match %r{'foo' is a default gem and can't be opened\.} , @ui.output
+    assert_match(/'foo' is a default gem and can't be opened\./, @ui.output)
     assert_equal "", @ui.error
   end
 end