https://git.ruby-lang.org/ruby.git/commit/?id=905b6aaa7c

From 905b6aaa7c5d327ab14bc7eaec13de5a34a82753 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 2 Nov 2021 17:28:23 +0900
Subject: test/readline/test_readline.rb: Use TERM=vt100 to run the tests

Readline seems to emit an escape sequence `"\e[?1034h` at an
unpredictable timing when `TERM=xterm` or something.
This leads to a noisy random test failure.

http://rubyci.s3.amazonaws.com/amazon2/ruby-master/log/20211102T063005Z.fail.html.gz
```
  1) Failure:
TestReadline#test_modify_text_in_pre_input_hook [/home/chkbuild/chkbuild/tmp/build/20211102T063005Z/ruby/test/readline/test_readline.rb:404]:
<"> hello world\n"> expected but was
<"\e[?1034h> hello world\n">.
```

This test is for Ruby's readline extension, not for readline library
itself. So here this change force to use "TERM=vt100" to run the tests.
---
 test/readline/test_readline.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index a0438aa1fdf..2dc5de756a4 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -7,6 +7,7 @@ require "open3" https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L7
 
 module BasetestReadline
   INPUTRC = "INPUTRC"
+  TERM = "TERM"
   SAVED_ENV = %w[COLUMNS LINES]
 
   TIMEOUT = 8
@@ -14,10 +15,12 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L15
   def setup
     @saved_env = ENV.values_at(*SAVED_ENV)
     @inputrc, ENV[INPUTRC] = ENV[INPUTRC], IO::NULL
+    @term, ENV[TERM] = ENV[TERM], "vt100"
   end
 
   def teardown
     ENV[INPUTRC] = @inputrc
+    ENV[TERM] = @term
     Readline.instance_variable_set("@completion_proc", nil)
     begin
       Readline.delete_text
-- 
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