From 126e1fc2961150a7026b9911a1ed82dbf9557af7 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@gmail.com>
Date: Sat, 8 Aug 2020 20:48:23 +0900
Subject: [ruby/irb] Make history infinite if set SAVE_HISTORY to negative

https://github.com/ruby/irb/commit/824473e880
---
 test/irb/test_history.rb | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'test')

diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index a2554faf26..bd03217fc0 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -75,6 +75,29 @@ module TestIRB
       HISTORY_FILE
     end
 
+    def test_history_save_minus_as_infinity
+      result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
+        IRB.conf[:USE_READLINE] = true
+        IRB.conf[:SAVE_HISTORY] = -1 # infinity
+      IRBRC
+        1
+        2
+        3
+        4
+      IRB_HISTORY
+        stdin.write("5\nexit\n")
+      end
+
+      assert_equal(<<~HISTORY_FILE, result_history_file)
+        1
+        2
+        3
+        4
+        5
+        exit
+      HISTORY_FILE
+    end
+
     private
 
     def launch_irb_with_irbrc_and_irb_history(irbrc, irb_history)
-- 
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