1 files changed, 20 insertions, 7 deletions
diff --git a/test/rdoc/test_rdoc_encoding.rb b/test/rdoc/test_rdoc_encoding.rb
index b5ffd7714c..d43bc2e244 100644
--- a/test/rdoc/test_rdoc_encoding.rb
+++ b/test/rdoc/test_rdoc_encoding.rb
@@ -1,15 +1,12 @@
 # coding: US-ASCII
 
-require 'rubygems'
-require 'minitest/autorun'
-require 'rdoc'
-require 'rdoc/encoding'
+require 'rdoc/test_case'
 
-require 'tempfile'
-
-class TestRDocEncoding < MiniTest::Unit::TestCase
+class TestRDocEncoding < RDoc::TestCase
 
   def setup
+    super
+
     @tempfile = Tempfile.new 'test_rdoc_encoding'
   end
 
@@ -100,6 +97,22 @@ class TestRDocEncoding < MiniTest::Unit::TestCase
     assert_equal Encoding::UTF_8, content.encoding
   end
 
+  def test_class_read_file_encoding_invalid
+    skip "Encoding not implemented" unless Object.const_defined? :Encoding
+
+    @tempfile.write "# coding: ascii\nM\xE4r"
+    @tempfile.flush
+
+    contents = :junk
+    _, err = capture_io do
+      contents = RDoc::Encoding.read_file @tempfile.path, Encoding::UTF_8
+    end
+
+    assert_equal "unable to convert \"\\xE4\" on US-ASCII for #{@tempfile.path}, skipping\n", err
+
+    assert_nil contents
+  end
+
   def test_class_read_file_encoding_with_signature
     skip "Encoding not implemented" unless defined? ::Encoding