[ruby/rdoc] Convert single quotes in character entity references

As well as double quotes.

https://github.com/ruby/rdoc/pull/824#discussion_r683173389

https://github.com/ruby/rdoc/commit/09002bdab5

1 files changed, 7 insertions, 0 deletions

diff --git a/test/rdoc/test_rdoc_text.rb b/test/rdoc/test_rdoc_text.rb
index 59d63b29bd..02c56a2829 100644
--- a/test/rdoc/test_rdoc_text.rb
+++ b/test/rdoc/test_rdoc_text.rb
@@ -485,6 +485,13 @@ The comments associated with
     assert_equal '‘a’ ‘', to_html("'a' '")
   end
 
+  def test_to_html_apostrophe_entity
+    assert_equal '‘a', to_html("'a")
+    assert_equal 'a’', to_html("a'")
+
+    assert_equal '‘a’ ‘', to_html("'a' '")
+  end
+
   def test_to_html_backslash
     assert_equal 'S', to_html('\\S')
   end