Rails 5+ compatibility in tests

HTML::Node and related classes came from html-scanner within
rails-deprecated_sanitizer, which is no longer a dependency of
rails-dom-testing.

spec/view_helpers/action_view_spec.rb

@@ -250,7 +250,7 @@ def renderer.gap() '<span class="my-gap">~~</span>' end
  end
 
  it "should paginate with custom route page parameter" do
- request.symbolized_path_parameters.update :controller => 'dummy', :action => nil
+ request.symbolized_path_parameters.update :controller => 'dummy', :action => 'index'
  paginate :per_page => 2 do
  assert_select 'a[href]', 6 do |links|
  assert_links_match %r{/page/(\d+)$}, links, [2, 3, 4, 5, 6, 2]
@@ -268,7 +268,7 @@ def renderer.gap() '<span class="my-gap">~~</span>' end
  end
 
  it "should paginate with custom route and first page number implicit" do
- request.symbolized_path_parameters.update :controller => 'ibocorp', :action => nil
+ request.symbolized_path_parameters.update :controller => 'ibocorp', :action => 'index'
  paginate :page => 2, :per_page => 2 do
  assert_select 'a[href]', 7 do |links|
  assert_links_match %r{/ibocorp(?:/(\d+))?$}, links, [nil, nil, 3, 4, 5, 6, 3]

spec/view_helpers/view_example_group.rb

@@ -143,4 +143,4 @@ def inner_text
  childless?? '' : super
  end
  end
-end
+end if defined?(HTML)