Add missing text_area alias in Action View FormHelper

Followup: rails#52467

Author: byroot

actionview/lib/action_view/helpers/form_helper.rb

@@ -2035,6 +2035,7 @@ def #{selector}(method, options = {})  # def text_field(method, options = {})
           end
         end
       end
+      alias_method :text_area, :textarea
 
       # Creates a scope around a specific model object like form_with, but
       # doesn't create the form tags themselves. This makes fields_for suitable

actionview/test/template/form_helper_test.rb

@@ -1644,6 +1644,19 @@ def test_form_for
     assert_dom_equal expected, @rendered
   end
 
+
+  def test_form_for_text_area_alias
+    form_for(@post, html: { id: "create-post" }) do |f|
+      concat f.text_area(:body)
+    end
+
+    expected = whole_form("/posts/123", "create-post", "edit_post", method: "patch") do
+      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" \
+    end
+
+    assert_dom_equal expected, @rendered
+  end
+
   def test_form_for_is_not_affected_by_form_with_generates_ids
     old_value = ActionView::Helpers::FormHelper.form_with_generates_ids
     ActionView::Helpers::FormHelper.form_with_generates_ids = false