add test which ensure received mail text attachment keeps original encoding (#21742)

This test fails on Ruby >= 2.1 and will be fixed by next revision.

Contributed by Pavel Rosický.

git-svn-id: http://svn.redmine.org/redmine/trunk@15183 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/mail_handler/ticket_with_text_attachment_iso-8859-2.eml

@@ -0,0 +1,31 @@
+Date: Thu, 14 Jan 2016 18:32:45 +0100
+From: John Smith <JSmith@somenet.foo>
+To: redmine@somenet.foo
+Message-ID: <7A3.L9Yi.1Ki1}PMZiV5.1Mbzkz@seznam.cz>
+Subject: issue #21742
+Mime-Version: 1.0
+Content-Type: multipart/mixed;
+ boundary="=_08d580646981073f1a667ba3=898e56d9-3d29-5ed2-9c9a-cc3a5d9474b5_=";
+ charset=UTF-8
+Content-Transfer-Encoding: 7bit
+X-Mailer: szn-ebox-4.5.88
+
+
+--=_08d580646981073f1a667ba3=898e56d9-3d29-5ed2-9c9a-cc3a5d9474b5_=
+Content-Type: text/plain;
+ charset=utf-8
+Content-Transfer-Encoding: base64
+
+
+--=_08d580646981073f1a667ba3=898e56d9-3d29-5ed2-9c9a-cc3a5d9474b5_=
+Content-Type: text/plain;
+ charset=UTF-8;
+ name=latin2.txt
+Content-Transfer-Encoding: quoted-printable
+Content-Disposition: attachment;
+ filename=latin2.txt;
+ size=19
+
+p=F8=EDli=B9 =BEluou=E8k=FD k=F9n=
+
+--=_08d580646981073f1a667ba3=898e56d9-3d29-5ed2-9c9a-cc3a5d9474b5_=--

test/unit/mail_handler_test.rb

@@ -578,6 +578,22 @@ class MailHandlerTest < ActiveSupport::TestCase
     assert_equal 'd8e8fca2dc0f896fd7cb4cb0031ba249', attachment.digest
   end
 
+  def test_mail_with_attachment_latin2
+    issue = submit_email(
+              'ticket_with_text_attachment_iso-8859-2.eml',
+              :issue => {:project => 'ecookbook'}
+            )
+    assert_kind_of Issue, issue
+    assert_equal 1, issue.attachments.size
+    attachment = issue.attachments.first
+    assert_equal 'latin2.txt', attachment.filename
+    assert_equal 19, attachment.filesize
+    assert File.exist?(attachment.diskfile)
+    assert_equal 19, File.size(attachment.diskfile)
+    content = "p\xF8\xEDli\xB9 \xBEluou\xE8k\xFD k\xF9n".force_encoding('CP852')
+    assert_equal content, File.read(attachment.diskfile).force_encoding('CP852')
+  end
+
   def test_multiple_inline_text_parts_should_be_appended_to_issue_description
     issue = submit_email('multiple_text_parts.eml', :issue => {:project => 'ecookbook'})
     assert_include 'first', issue.description