https://git.ruby-lang.org/ruby.git/commit/?id=522b256689

From 522b25668979892b10c71109a2520b300d57cb8c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 15 Feb 2021 15:55:58 +0900
Subject: Added tests for --backtrace-limit option

---
 test/ruby/test_rubyoptions.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/ruby/test_rubyoptions.rb b/test/ruby/test_rubyoptions.rb
index d860bf4..08f9e98 100644
--- a/test/ruby/test_rubyoptions.rb
+++ b/test/ruby/test_rubyoptions.rb
@@ -66,6 +66,18 @@ class TestRubyOptions < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rubyoptions.rb#L66
     end
   end
 
+  def test_backtrace_limit
+    assert_in_out_err(%w(--backtrace-limit), "", [], /missing argument for --backtrace-limit/)
+    assert_in_out_err(%w(--backtrace-limit= 1), "", [], /missing argument for --backtrace-limit/)
+    assert_in_out_err(%w(--backtrace-limit=-1), "", [], /wrong limit for backtrace length/)
+    code = 'def f(n);n > 0 ? f(n-1) : raise;end;f(5)'
+    assert_in_out_err(%w(--backtrace-limit=1), code, [],
+                      [/.*unhandled exception\n/, /^\tfrom .*\n/,
+                       /^\t \.{3} \d+ levels\.{3}\n/])
+    assert_in_out_err(%w(--backtrace-limit=3), code, [],
+                      [/.*unhandled exception\n/, *[/^\tfrom .*\n/]*3,
+                       /^\t \.{3} \d+ levels\.{3}\n/])
+  end
 
   def test_warning
     save_rubyopt = ENV['RUBYOPT']
-- 
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