From 00b26532f05283d2b160308522d1bd2146d6ac18 Mon Sep 17 00:00:00 2001
From: Mauro George <maurogot@gmail.com>
Date: Mon, 8 Dec 2014 20:22:36 -0200
Subject: Add a hidden_field on the file_field

This will avoid a error be raised when the only input on the form is the
`file_field`.
---
 actionview/test/template/form_helper_test.rb | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

(limited to 'actionview/test/template')

diff --git a/actionview/test/template/form_helper_test.rb b/actionview/test/template/form_helper_test.rb
index 1459b9f02a..0b3d78ea9b 100644
--- a/actionview/test/template/form_helper_test.rb
+++ b/actionview/test/template/form_helper_test.rb
@@ -472,18 +472,33 @@ class FormHelperTest < ActionView::TestCase
     assert_dom_equal expected, text_field(object_name, "title")
   end
 
-  def test_file_field_has_no_size
+  def test_file_field_does_generate_a_hidden_field
+    expected = '<input name="user[avatar]" type="hidden" value="" /><input id="user_avatar" name="user[avatar]" type="file" />'
+    assert_dom_equal expected, file_field("user", "avatar")
+  end
+
+  def test_file_field_does_not_generate_a_hidden_field_if_included_hidden_option_is_false
+    expected = '<input id="user_avatar" name="user[avatar]" type="file" />'
+    assert_dom_equal expected, file_field("user", "avatar", :include_hidden => false)
+  end
+
+  def test_file_field_does_not_generate_a_hidden_field_if_included_hidden_option_is_false_with_key_as_string
     expected = '<input id="user_avatar" name="user[avatar]" type="file" />'
+    assert_dom_equal expected, file_field("user", "avatar", 'include_hidden' => false)
+  end
+
+  def test_file_field_has_no_size
+    expected = '<input name="user[avatar]" type="hidden" value="" /><input id="user_avatar" name="user[avatar]" type="file" />'
     assert_dom_equal expected, file_field("user", "avatar")
   end
 
   def test_file_field_with_multiple_behavior
-    expected = '<input id="import_file" multiple="multiple" name="import[file][]" type="file" />'
+    expected = '<input name="import[file][]" type="hidden" value="" /><input id="import_file" multiple="multiple" name="import[file][]" type="file" />'
     assert_dom_equal expected, file_field("import", "file", :multiple => true)
   end
 
   def test_file_field_with_multiple_behavior_and_explicit_name
-    expected = '<input id="import_file" multiple="multiple" name="custom" type="file" />'
+    expected = '<input name="custom" type="hidden" value="" /><input id="import_file" multiple="multiple" name="custom" type="file" />'
     assert_dom_equal expected, file_field("import", "file", :multiple => true, :name => "custom")
   end
 
@@ -1719,7 +1734,7 @@ class FormHelperTest < ActionView::TestCase
     end
 
     expected = whole_form("/posts/123", "create-post", "edit_post", method: "patch", multipart: true) do
-      "<input name='post[file]' type='file' id='post_file' />"
+      "<input name='post[file]' type='hidden' value='' /><input name='post[file]' type='file' id='post_file' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1735,7 +1750,7 @@ class FormHelperTest < ActionView::TestCase
     end
 
     expected = whole_form("/posts/123", "edit_post_123", "edit_post", method: "patch", multipart: true) do
-      "<input name='post[comment][file]' type='file' id='post_comment_file' />"
+      "<input name='post[comment][file]' type='hidden' value='' /><input name='post[comment][file]' type='file' id='post_comment_file' />"
     end
 
     assert_dom_equal expected, output_buffer
-- 
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