diff --git a/app/models/observer/ticket/notification/background_job.rb b/app/models/observer/ticket/notification/background_job.rb
index afc088a78..53a56e9e2 100644
--- a/app/models/observer/ticket/notification/background_job.rb
+++ b/app/models/observer/ticket/notification/background_job.rb
@@ -215,6 +215,7 @@ class Observer::Ticket::Notification::BackgroundJob
 #{article.body.text2html}
 </blockquote>
 &lt;/snip&gt;
+<br>
 <br>'
     end
 
@@ -280,6 +281,7 @@ State: i18n(#{ticket.state.name.text2html})<br>
 #{article.body.text2html}
 </blockquote>
 &lt;/snip&gt;
+<br>
 <br>'
     end
     if user.preferences[:locale] =~ /^de/i
diff --git a/lib/core_ext/string.rb b/lib/core_ext/string.rb
index f88fddbba..72d6241c4 100644
--- a/lib/core_ext/string.rb
+++ b/lib/core_ext/string.rb
@@ -19,8 +19,18 @@ class String
       line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
     end * "\n"
   end
+
+=begin
+
+  filename = 'Some::Module'.to_filename
+
+  returns
+    'some/module'
+
+=end
+
   def to_filename
-    camel_cased_word = self.to_s
+    camel_cased_word = "#{self}"
     camel_cased_word.gsub(/::/, '/').downcase
   end
 
@@ -43,10 +53,14 @@ class String
 
   text = html_string.html2text
 
+  returns
+
+    'string with text'
+
 =end
 
   def html2text
-    string = self
+    string = "#{self}"
 
     # in case of invalid encodeing, strip invalid chars
     # see also test/fixtures/mail21.box
diff --git a/test/unit/aaa_string_parser_test.rb b/test/unit/aaa_string_parser_test.rb
new file mode 100644
index 000000000..9761f2107
--- /dev/null
+++ b/test/unit/aaa_string_parser_test.rb
@@ -0,0 +1,129 @@
+# encoding: utf-8
+require 'test_helper'
+
+class AaaStringTest < ActiveSupport::TestCase
+
+  test 'to_filename ref' do
+    modul  = 'test'
+    result = 'test'
+    modul.to_filename
+    assert_equal( result,  modul )
+
+    modul  = 'Some::File'
+    result = 'Some::File'
+    modul.to_filename
+    assert_equal( result,  modul )
+  end
+
+  test 'to_filename function' do
+    modul  = 'test'
+    result = 'test'
+    assert_equal( result,  modul.to_filename )
+
+    modul  = 'Some::File'
+    result = 'some/file'
+    assert_equal( result,  modul.to_filename )
+  end
+
+  test 'html2text ref' do
+    html   = 'test'
+    result = 'test'
+    html.html2text
+    assert_equal( result,  html )
+
+    html   = '<div>test</div>'
+    result = '<div>test</div>'
+    html.html2text
+    assert_equal( result,  html )
+  end
+
+  test 'html2text function' do
+
+    html   = 'test'
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = '  test '
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = "\n\n  test \n\n\n"
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = '<div>test</div>'
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = '<div>test<br></div>'
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = "<div>test<br><br><br>\n<br>\n<br>\n</div>"
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = "<pre>test\n\ntest</pre>"
+    result = "test\ntest"
+    assert_equal( result, html.html2text )
+
+    html   = "<code>test\n\ntest</code>"
+    result = "test\ntest"
+    assert_equal( result, html.html2text )
+
+    html   = "<table><tr><td>test</td><td>col</td></td></tr><tr><td>test</td><td>4711</td></tr></table>"
+    result = "test col  \ntest 4711"
+    assert_equal( result, html.html2text )
+
+
+    html   = "<!-- some comment -->
+    <div>
+    test<br><br><br>\n<br>\n<br>\n
+    </div>"
+    result = 'test'
+    assert_equal( result, html.html2text )
+
+    html   = "\n<div><a href=\"http://zammad.org\">Best Tool of the World</a>
+     some other text</div>
+    <div>"
+    result = "[1] Best Tool of the Worldsome other text\n\n\n[1] http://zammad.org"
+    assert_equal( result, html.html2text )
+
+    html   = "<!-- some comment -->
+    <div>
+    test<br><br><br>\n<hr/>\n<br>\n
+    </div>"
+    result = "test\n\n___"
+    assert_equal( result, html.html2text )
+
+    html = ' line&nbsp;1<br>
+you<br/>
+-----&amp;'
+    should = 'line 1
+you
+-----&'
+    assert_equal( should, html.html2text )
+
+
+    html = ' <ul><li>#1</li><li>#2</li></ul>'
+    should = '* #1
+* #2'
+    assert_equal( should, html.html2text )
+
+    html = '<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
+  <head>
+  <body style="font-family:Geneva,Helvetica,Arial,sans-serif; font-size: 12px;">
+    <div>&gt; Welcome!</div><div>&gt;</div><div>&gt; Thank you for installing Zammad.</div><div>&gt;</div>
+  </body>
+</html>'
+    should = '> Welcome!
+>
+> Thank you for installing Zammad.
+>'
+    assert_equal( should, html.html2text )
+
+  end
+end
\ No newline at end of file
diff --git a/test/unit/email_build_test.rb b/test/unit/email_build_test.rb
index dfd775612..7f7764d7b 100644
--- a/test/unit/email_build_test.rb
+++ b/test/unit/email_build_test.rb
@@ -163,93 +163,4 @@ class EmailBuildTest < ActiveSupport::TestCase
 
   end
 
-  test 'html2text' do
-
-    html   = 'test'
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = '  test '
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = "\n\n  test \n\n\n"
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = '<div>test</div>'
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = '<div>test<br></div>'
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = "<div>test<br><br><br>\n<br>\n<br>\n</div>"
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = "<pre>test\n\ntest</pre>"
-    result = "test\ntest"
-    assert_equal( result, html.html2text )
-
-    html   = "<code>test\n\ntest</code>"
-    result = "test\ntest"
-    assert_equal( result, html.html2text )
-
-    html   = "<table><tr><td>test</td><td>col</td></td></tr><tr><td>test</td><td>4711</td></tr></table>"
-    result = "test col  \ntest 4711"
-    assert_equal( result, html.html2text )
-
-
-    html   = "<!-- some comment -->
-    <div>
-    test<br><br><br>\n<br>\n<br>\n
-    </div>"
-    result = 'test'
-    assert_equal( result, html.html2text )
-
-    html   = "\n<div><a href=\"http://zammad.org\">Best Tool of the World</a>
-     some other text</div>
-    <div>"
-    result = "[1] Best Tool of the Worldsome other text\n\n\n[1] http://zammad.org"
-    assert_equal( result, html.html2text )
-
-    html   = "<!-- some comment -->
-    <div>
-    test<br><br><br>\n<hr/>\n<br>\n
-    </div>"
-    result = "test\n\n___"
-    assert_equal( result, html.html2text )
-
-    html = ' line&nbsp;1<br>
-you<br/>
------&amp;'
-    should = 'line 1
-you
------&'
-    assert_equal( should, html.html2text )
-
-
-    html = ' <ul><li>#1</li><li>#2</li></ul>'
-    should = '* #1
-* #2'
-    assert_equal( should, html.html2text )
-
-    html = '<!DOCTYPE html>
-<html>
-  <head>
-    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
-  <head>
-  <body style="font-family:Geneva,Helvetica,Arial,sans-serif; font-size: 12px;">
-    <div>&gt; Welcome!</div><div>&gt;</div><div>&gt; Thank you for installing Zammad.</div><div>&gt;</div>
-  </body>
-</html>'
-    should = '> Welcome!
->
-> Thank you for installing Zammad.
->'
-    assert_equal( should, html.html2text )
-
-  end
 end
\ No newline at end of file