Remove the leading \n added by textarea on assert_select

actionpack/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Rails 3.2.3 (unreleased) ##
 
+*   Remove the leading \n added by textarea on assert_select. *Santiago Pastorino*
+
 *   Fix #5632, render :inline set the proper rendered format. *Santiago Pastorino*
 
 *   Fix textarea rendering when using plugins like HAML. Such plugins encode the first newline character in the content. This issue was introduced in https://github.com/rails/rails/pull/5191 *James Coleman*

actionpack/lib/action_dispatch/testing/assertions/selector.rb

@@ -269,6 +269,7 @@ def assert_select(*args, &block)
               end
             end
             text.strip! unless NO_STRIP.include?(match.name)
+            text.sub!(/\A\n/, '') if match.name == "textarea"
             unless match_with.is_a?(Regexp) ? (text =~ match_with) : (text == match_with.to_s)
               content_mismatch ||= build_message(message, "<?> expected but was\n<?>.", match_with, text)
               true

actionpack/test/controller/assert_select_test.rb

@@ -135,6 +135,13 @@ def test_equality_of_html
     assert_raise(Assertion) { assert_select "pre", :html=>text }
   end
 
+  def test_strip_textarea
+    render_html %Q{<textarea>\n\nfoo\n</textarea>}
+    assert_select "textarea", "\nfoo\n"
+    render_html %Q{<textarea>\nfoo</textarea>}
+    assert_select "textarea", "foo"
+  end
+
   def test_counts
     render_html %Q{<div id="1">foo</div><div id="2">foo</div>}
     assert_nothing_raised               { assert_select "div", 2 }