1 files changed, 17 insertions, 0 deletions
diff --git a/test/rdoc/test_rdoc_encoding.rb b/test/rdoc/test_rdoc_encoding.rb
index f50e2f6012..7ec39f8a9c 100644
--- a/test/rdoc/test_rdoc_encoding.rb
+++ b/test/rdoc/test_rdoc_encoding.rb
@@ -131,6 +131,23 @@ class TestRDocEncoding < RDoc::TestCase
     assert_equal "hi everybody", content, bug3360
   end
 
+  def test_class_read_file_encoding_iso_2022_jp
+    skip "Encoding not implemented" unless Object.const_defined? :Encoding
+
+    input = "# coding: ISO-2022-JP\n:\e$B%3%^%s%I\e(B:"
+
+    @tempfile.write input
+    @tempfile.flush
+
+    contents = RDoc::Encoding.read_file @tempfile.path, Encoding::UTF_8
+
+    expected = ":\xe3\x82\xb3\xe3\x83\x9e\xe3\x83\xb3\xe3\x83\x89:"
+    expected.force_encoding Encoding::UTF_8
+
+    assert_equal expected, contents
+    assert_equal Encoding::UTF_8, contents.encoding
+  end
+
   def test_class_set_encoding
     s = "# coding: UTF-8\n"
     RDoc::Encoding.set_encoding s