Remove quotes from Regexp when printing error messages.

Already found a way to make this look nicer. Since the `@css_selector` is purely for
presentation and never hits Nokogiri it doesn't have to be in quotes and we can make it
look like the what the user put in.

Replaces `div:match\('id',\ "\/wups\/"\)` with `div:match('id', /wups/)`.

Author: kaspth

lib/rails/dom/testing/assertions/selector_assertions/substitution_context.rb

@@ -19,11 +19,12 @@ def match(matches, attribute, matcher)
 
   private
     def matcher_for(value, format_for_presentation)
-      if format_for_presentation && value.is_a?(Regexp)
-        value = value.inspect # Inspect Regexps for readability in error messages.
+      # Nokogiri doesn't like arbitrary values without quotes, hence inspect.
+      if format_for_presentation
+        value.inspect # Avoid to_s so Regexps aren't put in quotes.
+      else
+        value.to_s.inspect
       end
-
-      value.to_s.inspect # Nokogiri doesn't like arbitrary values without quotes, hence inspect.
     end
 
     def substitutable?(value)

test/selector_assertions_test.rb

@@ -239,7 +239,7 @@ def test_nested_assert_select_with_match_failure_shows_nice_regex
       assert_select "div:match('id', ?)", /wups/
     end
 
-    assert_match %Q{div:match('id', "/wups/")}, error.message
+    assert_match %Q{div:match('id', /wups/)}, error.message
   end
 
   def test_feed_item_encoded