* ext/digest/lib/digest.rb (Digest::Class.file): Take optional

arguments that are passed to the constructor of the digest
  class.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40879 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/digest/test_digest.rb

@@ -4,6 +4,7 @@
 # $Id$
 
 require 'test/unit'
+require 'tempfile'
 
 require 'digest'
 %w[digest/md5 digest/rmd160 digest/sha1 digest/sha2].each do |lib|
@@ -78,6 +79,16 @@ module TestDigest
     assert_equal(md1, md2, self.class::ALGO)
   end
 
+  def test_s_file
+    Tempfile.create("test_digest_file") { |tmpfile|
+      str = "hello, world.\r\n"
+      tmpfile.print str
+      tmpfile.close
+
+      assert_equal self.class::ALGO.new.update(str), self.class::ALGO.file(tmpfile.path)
+    }
+  end
+
   def test_instance_eval
     assert_nothing_raised {
       self.class::ALGO.new.instance_eval { update "a" }
@@ -138,6 +149,20 @@ module TestDigest
     }
   end if defined?(Digest::SHA512)
 
+  class TestSHA2 < Test::Unit::TestCase
+
+  def test_s_file
+    Tempfile.create("test_digest_file") { |tmpfile|
+      str = Data1
+      tmpfile.print str
+      tmpfile.close
+
+      assert_equal "cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed8086072ba1e7cc2358baeca134c825a7", Digest::SHA2.file(tmpfile.path, 384).hexdigest
+    }
+  end
+
+  end if defined?(Digest::SHA2)
+
   class TestRMD160 < Test::Unit::TestCase
     include TestDigest
     ALGO = Digest::RMD160