https://git.ruby-lang.org/ruby.git/commit/?id=b33caa5bbc

From b33caa5bbc1ff6cb2ea1656419e1fa09e3e60690 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sun, 10 Oct 2021 23:02:50 -0700
Subject: [ruby/irb] Add a test of find_end for show_source command

https://github.com/ruby/irb/commit/68e6ca95a0
---
 test/irb/test_cmd.rb | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/test/irb/test_cmd.rb b/test/irb/test_cmd.rb
index e6bb587b5c..f3e1d44358 100644
--- a/test/irb/test_cmd.rb
+++ b/test/irb/test_cmd.rb
@@ -509,6 +509,29 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_cmd.rb#L509
       assert_match(%r[/irb\.rb], out)
     end
 
+    def test_show_source_end_finder
+      code = <<~EOS.gsub(/^/, ' ' * 4); eval(code, binding, __FILE__, __LINE__ + 1) unless respond_to?(:show_source_test_method)
+        def show_source_test_method
+          unless true
+          end
+        end
+      EOS
+      input = TestInputMethod.new([
+        "show_source 'TestIRB::ExtendCommand#show_source_test_method'\n",
+      ])
+      IRB.init_config(nil)
+      workspace = IRB::WorkSpace.new(self)
+      IRB.conf[:VERBOSE] = false
+      irb = IRB::Irb.new(workspace, input)
+      IRB.conf[:MAIN_CONTEXT] = irb.context
+      irb.context.return_format = "=> %s\n"
+      out, err = capture_output do
+        irb.eval_input
+      end
+      assert_empty err
+      assert_include(out, code)
+    end
+
     def test_whereami
       input = TestInputMethod.new([
         "whereami\n",
@@ -525,5 +548,11 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_cmd.rb#L548
       assert_empty err
       assert_match(/^From: .+ @ line \d+ :\n/, out)
     end
+
+    # This method is used for testing show_source command
+    def show_source_test_method
+      unless true
+      end
+    end
   end
 end
-- 
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