From 741261c6d0227f44e8a49e53bece19931ec26fd2 Mon Sep 17 00:00:00 2001
From: Joe Fiorini <joe@joefiorini.com>
Date: Mon, 31 Oct 2011 14:35:51 -0400
Subject: [PATCH] Add matcher for javascript error checking

---
 lib/capybara/webkit/matchers.rb | 39 +++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 lib/capybara/webkit/matchers.rb

diff --git a/lib/capybara/webkit/matchers.rb b/lib/capybara/webkit/matchers.rb
new file mode 100644
index 0000000..a0af3c0
--- /dev/null
+++ b/lib/capybara/webkit/matchers.rb
@@ -0,0 +1,39 @@
+module Capybara
+  module Webkit
+    module RspecMatchers
+      extend RSpec::Matchers::DSL
+
+      matcher :have_errors do |expected|
+        match do |actual|
+          actual = resolve(actual)
+          actual.error_messages.any?
+        end
+
+        failure_message_for_should do |actual|
+          "Expected Javascript errors, but there were none."
+        end
+        failure_message_for_should_not do |actual|
+          actual = resolve(actual)
+          "Expected no Javascript errors, got:\n#{error_messages_for(actual)}"
+        end
+
+        def error_messages_for(obj)
+          obj.error_messages.map do |m|
+            "  - #{m[:message]}"
+          end.join("\n")
+        end
+
+        def resolve(actual)
+          if actual.respond_to? :page
+            actual.page.driver
+          elsif actual.respond_to? :driver
+            actual.driver
+          else
+            actual
+          end
+        end
+      end
+
+    end
+  end
+end