https://git.ruby-lang.org/ruby.git/commit/?id=4268084d69

From 4268084d699922d7650b0bf6327042f3331d5ca3 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Tue, 9 Jun 2020 00:10:14 +0900
Subject: [ruby/irb] Add encoding magic comments of editors

https://github.com/ruby/irb/commit/f8c10ea24b

diff --git a/test/irb/test_ruby_lex.rb b/test/irb/test_ruby_lex.rb
index bc5b4fe..7768a6a 100644
--- a/test/irb/test_ruby_lex.rb
+++ b/test/irb/test_ruby_lex.rb
@@ -152,5 +152,31 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_ruby_lex.rb#L152
         assert_indenting(lines, row.new_line_spaces, true)
       end
     end
+
+    def test_incomplete_emacs_coding_magic_comment
+      input_with_correct_indents = [
+        Row.new(%q(# -*- coding: u), nil, 0),
+      ]
+
+      lines = []
+      input_with_correct_indents.each do |row|
+        lines << row.content
+        assert_indenting(lines, row.current_line_spaces, false)
+        assert_indenting(lines, row.new_line_spaces, true)
+      end
+    end
+
+    def test_incomplete_vim_coding_magic_comment
+      input_with_correct_indents = [
+        Row.new(%q(# vim:set fileencoding=u), nil, 0),
+      ]
+
+      lines = []
+      input_with_correct_indents.each do |row|
+        lines << row.content
+        assert_indenting(lines, row.current_line_spaces, false)
+        assert_indenting(lines, row.new_line_spaces, true)
+      end
+    end
   end
 end
-- 
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