test/webrick/test_filehandler.rb: stricter multipart range test

We need to ensure we generate compatibile output in
the face of future changes

* test/webrick/test_filehandler.rb (test_make_partial_content):
  check response body

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62956 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/webrick/test_filehandler.rb

@@ -75,6 +75,23 @@ class WEBrick::TestFileHandler < Test::Unit::TestCase
 
     res = make_range_response(filename, "bytes=0-0, -2")
     assert_match(%r{^multipart/byteranges}, res["content-type"])
+    body = get_res_body(res)
+    boundary = /; boundary=(.+)/.match(res['content-type'])[1]
+    off = filesize - 2
+    last = filesize - 1
+
+    exp = "--#{boundary}\r\n" \
+          "Content-Type: text/plain\r\n" \
+          "Content-Range: bytes 0-0/#{filesize}\r\n" \
+          "\r\n" \
+          "#{IO.read(__FILE__, 1)}\r\n" \
+          "--#{boundary}\r\n" \
+          "Content-Type: text/plain\r\n" \
+          "Content-Range: bytes #{off}-#{last}/#{filesize}\r\n" \
+          "\r\n" \
+          "#{IO.read(__FILE__, 2, off)}\r\n" \
+          "--#{boundary}--\r\n"
+    assert_equal exp, body
   end
 
   def test_filehandler