https://git.ruby-lang.org/ruby.git/commit/?id=b2159f7c38

From b2159f7c38262f5d0746a3cfb9b33ea9d62ed813 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Mon, 18 Jan 2021 23:35:31 -0800
Subject: [ruby/irb] Stub a screen size for tests

https://github.com/ruby/irb/commit/6663057083

diff --git a/test/irb/test_color.rb b/test/irb/test_color.rb
index d035e44..4598021 100644
--- a/test/irb/test_color.rb
+++ b/test/irb/test_color.rb
@@ -18,6 +18,21 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L18
     MAGENTA   = "\e[35m"
     CYAN      = "\e[36m"
 
+    def setup
+      super
+      @get_screen_size = Reline.method(:get_screen_size)
+      Reline.instance_eval { undef :get_screen_size }
+      def Reline.get_screen_size
+        [36, 80]
+      end
+    end
+
+    def teardown
+      Reline.instance_eval { undef :get_screen_size }
+      Reline.define_singleton_method(:get_screen_size, @get_screen_size)
+      super
+    end
+
     def test_colorize_code
       # Common behaviors. Warn parser error, but do not warn compile error.
       tests = {
-- 
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