https://git.ruby-lang.org/ruby.git/commit/?id=5219b4ddb4

From 5219b4ddb4b89dfe8a951da75f5ab78431781d7f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 15 Apr 2021 22:24:02 +0900
Subject: [ruby/irb] Added setup and teardown to TestIRB::TestInit

Not to be affected by existing rc files in all tests.

https://github.com/ruby/irb/commit/bf434892b4
---
 test/irb/test_init.rb | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/test/irb/test_init.rb b/test/irb/test_init.rb
index 2c50b5d..d57f075 100644
--- a/test/irb/test_init.rb
+++ b/test/irb/test_init.rb
@@ -5,6 +5,19 @@ require "fileutils" https://github.com/ruby/ruby/blob/trunk/test/irb/test_init.rb#L5
 
 module TestIRB
   class TestInit < Test::Unit::TestCase
+    def setup
+      # IRBRC is for RVM...
+      @backup_env = %w[HOME XDG_CONFIG_HOME IRBRC].each_with_object({}) do |env, hash|
+        hash[env] = ENV.delete(env)
+      end
+      ENV["HOME"] = @tmpdir = Dir.mktmpdir("test_irb_init_#{$$}")
+    end
+
+    def teardown
+      ENV.update(@backup_env)
+      FileUtils.rm_rf(@tmpdir)
+    end
+
     def test_setup_with_argv_preserves_global_argv
       argv = ["foo", "bar"]
       with_argv(argv) do
@@ -20,12 +33,8 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_init.rb#L33
     end
 
     def test_rc_file
-      backup_irbrc = ENV.delete("IRBRC") # This is for RVM...
-      backup_xdg_config_home = ENV.delete("XDG_CONFIG_HOME")
-      backup_home = ENV["HOME"]
-      Dir.mktmpdir("test_irb_init_#{$$}") do |tmpdir|
-        ENV["HOME"] = tmpdir
-
+      tmpdir = @tmpdir
+      Dir.chdir(tmpdir) do
         IRB.conf[:RC_NAME_GENERATOR] = nil
         assert_equal(tmpdir+"/.irb#{IRB::IRBRC_EXT}", IRB.rc_file)
         assert_equal(tmpdir+"/.irb_history", IRB.rc_file("_history"))
@@ -34,19 +43,11 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_init.rb#L43
         assert_equal(tmpdir+"/.irb#{IRB::IRBRC_EXT}", IRB.rc_file)
         assert_equal(tmpdir+"/.irb_history", IRB.rc_file("_history"))
       end
-    ensure
-      ENV["HOME"] = backup_home
-      ENV["XDG_CONFIG_HOME"] = backup_xdg_config_home
-      ENV["IRBRC"] = backup_irbrc
     end
 
     def test_rc_file_in_subdir
-      backup_irbrc = ENV.delete("IRBRC") # This is for RVM...
-      backup_xdg_config_home = ENV.delete("XDG_CONFIG_HOME")
-      backup_home = ENV["HOME"]
-      Dir.mktmpdir("test_irb_init_#{$$}") do |tmpdir|
-        ENV["HOME"] = tmpdir
-
+      tmpdir = @tmpdir
+      Dir.chdir(tmpdir) do
         FileUtils.mkdir_p("#{tmpdir}/mydir")
         Dir.chdir("#{tmpdir}/mydir") do
           IRB.conf[:RC_NAME_GENERATOR] = nil
@@ -58,10 +59,6 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_init.rb#L59
           assert_equal(tmpdir+"/.irb_history", IRB.rc_file("_history"))
         end
       end
-    ensure
-      ENV["HOME"] = backup_home
-      ENV["XDG_CONFIG_HOME"] = backup_xdg_config_home
-      ENV["IRBRC"] = backup_irbrc
     end
 
     def test_recovery_sigint
-- 
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