3 files changed, 80 insertions, 0 deletions
diff --git a/actionview/test/template/erb/form_for_test.rb b/actionview/test/template/erb/form_for_test.rb
new file mode 100644
index 0000000000..b3a47e17a4
--- /dev/null
+++ b/actionview/test/template/erb/form_for_test.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "template/erb/helper"
+
+module ERBTest
+  class TagHelperTest < BlockTestCase
+    test "form_for works" do
+      routes = ActionDispatch::Routing::RouteSet.new
+      routes.draw do
+        get "/blah/update", to: "blah#update"
+      end
+      output = render_content "form_for(:staticpage, :url => {:controller => 'blah', :action => 'update'})", "", routes
+      assert_match %r{<form.*action="/blah/update".*method="post">.*</form>}, output
+    end
+  end
+end
diff --git a/actionview/test/template/erb/helper.rb b/actionview/test/template/erb/helper.rb
new file mode 100644
index 0000000000..727cc3dcf2
--- /dev/null
+++ b/actionview/test/template/erb/helper.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+module ERBTest
+  class ViewContext
+    include ActionView::Helpers::UrlHelper
+    include ActionView::Helpers::TagHelper
+    include ActionView::Helpers::JavaScriptHelper
+    include ActionView::Helpers::FormHelper
+
+    attr_accessor :output_buffer, :controller
+
+    def protect_against_forgery?() false end
+  end
+
+  class BlockTestCase < ActiveSupport::TestCase
+    def render_content(start, inside, routes = nil)
+      routes ||= ActionDispatch::Routing::RouteSet.new.tap do |rs|
+        rs.draw { }
+      end
+      context = Class.new(ViewContext) {
+        include routes.url_helpers
+      }.new
+      template = block_helper(start, inside)
+      ActionView::Template::Handlers::ERB.erb_implementation.new(template).evaluate(context)
+    end
+
+    def block_helper(str, rest)
+      "<%= #{str} do %>#{rest}<% end %>"
+    end
+  end
+end
diff --git a/actionview/test/template/erb/tag_helper_test.rb b/actionview/test/template/erb/tag_helper_test.rb
new file mode 100644
index 0000000000..24a7592950
--- /dev/null
+++ b/actionview/test/template/erb/tag_helper_test.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "template/erb/helper"
+
+module ERBTest
+  class TagHelperTest < BlockTestCase
+    test "percent equals works for content_tag and does not require parenthesis on method call" do
+      assert_equal "<div>Hello world</div>", render_content("content_tag :div", "Hello world")
+    end
+
+    test "percent equals works for javascript_tag" do
+      expected_output = "<script>\n//<![CDATA[\nalert('Hello')\n//]]>\n</script>"
+      assert_equal expected_output, render_content("javascript_tag", "alert('Hello')")
+    end
+
+    test "percent equals works for javascript_tag with options" do
+      expected_output = "<script id=\"the_js_tag\">\n//<![CDATA[\nalert('Hello')\n//]]>\n</script>"
+      assert_equal expected_output, render_content("javascript_tag(:id => 'the_js_tag')", "alert('Hello')")
+    end
+
+    test "percent equals works with form tags" do
+      expected_output = %r{<form.*action="/foo".*method="post">.*hello*</form>}
+      assert_match expected_output, render_content("form_tag('/foo')", "<%= 'hello' %>")
+    end
+
+    test "percent equals works with fieldset tags" do
+      expected_output = "<fieldset><legend>foo</legend>hello</fieldset>"
+      assert_equal expected_output, render_content("field_set_tag('foo')", "<%= 'hello' %>")
+    end
+  end
+end