[ruby/irb] Suppress crash when bignum is set to SAVE_HISTORY

https://github.com/ruby/irb/commit/5044eb2730

1 files changed, 23 insertions, 0 deletions

diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index dbfdf6fb2b..a2554faf26 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -52,6 +52,29 @@ module TestIRB
       HISTORY_FILE
     end
 
+    def test_history_save_bignum
+      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] = 10 ** 19
+      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)