2 files changed, 10 insertions, 3 deletions
diff --git a/test/digest/test_digest.rb b/test/digest/test_digest.rb
index 661129083a..4b1d55e256 100755
--- a/test/digest/test_digest.rb
+++ b/test/digest/test_digest.rb
@@ -25,21 +25,27 @@ module TestDigest
 
   def test_s_hexdigest
     self.class::DATA.each do |str, hexdigest|
-      assert_equal(hexdigest, self.class::ALGO.hexdigest(str))
+      actual = self.class::ALGO.hexdigest(str)
+      assert_equal(hexdigest, actual)
+      assert_equal(Encoding::US_ASCII, actual.encoding)
     end
   end
 
   def test_s_base64digest
     self.class::DATA.each do |str, hexdigest|
       digest = [hexdigest].pack("H*")
-      assert_equal([digest].pack("m0"), self.class::ALGO.base64digest(str))
+      actual = self.class::ALGO.base64digest(str)
+      assert_equal([digest].pack("m0"), actual)
+      assert_equal(Encoding::US_ASCII, actual.encoding)
     end
   end
 
   def test_s_digest
     self.class::DATA.each do |str, hexdigest|
       digest = [hexdigest].pack("H*")
-      assert_equal(digest, self.class::ALGO.digest(str))
+      actual = self.class::ALGO.digest(str)
+      assert_equal(digest, actual)
+      assert_equal(Encoding::BINARY, actual.encoding)
     end
   end
 
diff --git a/test/digest/test_digest_extend.rb b/test/digest/test_digest_extend.rb
index 577fd7a455..2992e28877 100644
--- a/test/digest/test_digest_extend.rb
+++ b/test/digest/test_digest_extend.rb
@@ -49,6 +49,7 @@ class TestDigestExtend < Test::Unit::TestCase
       (0..0xff).to_a.map { |c| sprintf("%02x", c ) }.join(''),
       Digest.hexencode((0..0xff).to_a.map { |c| c.chr }.join(''))
     )
+    assert_equal(Encoding::US_ASCII, Digest.hexencode("\1\2").encoding)
   end
 
   def test_class_reset