make test more resilient to future changes by not

testing the count and not testing the internal value
of the registered mime type.

Ideally all mime type registration should be cleaned up
in teardown.

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/test/dispatch/mime_type_test.rb

@@ -31,9 +31,7 @@ class MimeTypeTest < ActiveSupport::TestCase
   test "parse image with trailing star" do
     accept = "image/*"
     parsed = Mime::Type.parse(accept)
-    assert_equal 2, parsed.size
     assert parsed.include?(Mime::PNG)
-    assert_equal 'image/*', parsed[1].instance_variable_get('@string')
   end
 
   test "parse without q" do