Introduce write_rc test helper

test/irb/helper.rb

@@ -92,6 +92,13 @@ def setup
       end
 
       @envs = {}
+      @tmpfiles = []
+    end
+
+    def teardown
+      @tmpfiles.each do |tmpfile|
+        File.unlink(tmpfile)
+      end
     end
 
     def run_ruby_file(&block)
@@ -133,7 +140,6 @@ def run_ruby_file(&block)
       MSG
       assert_block(message) { false }
     ensure
-      File.unlink(@ruby_file) if @ruby_file
       FileUtils.remove_entry tmp_dir
     end
 
@@ -180,8 +186,17 @@ def type(command)
 
     def write_ruby(program)
       @ruby_file = Tempfile.create(%w{irb- .rb})
+      @tmpfiles << @ruby_file
       @ruby_file.write(program)
       @ruby_file.close
     end
+
+    def write_rc(content)
+      @irbrc = Tempfile.new('irbrc')
+      @tmpfiles << @irbrc
+      @irbrc.write(content)
+      @irbrc.close
+      @envs['IRBRC'] = @irbrc.path
+    end
   end
 end

test/irb/test_debug_cmd.rb

@@ -290,12 +290,9 @@ def test_prompt_line_number_continues
     end
 
     def test_prompt_irb_name_is_kept
-      @irbrc = Tempfile.new('irbrc')
-      @irbrc.write <<~RUBY
+      write_rc <<~RUBY
         IRB.conf[:IRB_NAME] = "foo"
       RUBY
-      @irbrc.close
-      @envs['IRBRC'] = @irbrc.path
 
       write_ruby <<~'ruby'
         binding.irb
@@ -309,8 +306,6 @@ def test_prompt_irb_name_is_kept
 
       assert_match(/foo\(main\):001> next/, output)
       assert_match(/foo:rdbg\(main\):002> continue/, output)
-    ensure
-      @irbrc&.unlink
     end
 
     def test_irb_commands_are_available_after_moving_around_with_the_debugger

test/irb/test_history.rb

@@ -326,12 +326,9 @@ def write_history(history)
       @history_file = Tempfile.new('irb_history')
       @history_file.write(history)
       @history_file.close
-      @irbrc = Tempfile.new('irbrc')
-      @irbrc.write <<~RUBY
+      write_rc <<~RUBY
         IRB.conf[:HISTORY_FILE] = "#{@history_file.path}"
       RUBY
-      @irbrc.close
-      @envs['IRBRC'] = @irbrc.path
     end
   end
 end