diff --git a/spec/fail_middleware_spec.rb b/spec/fail_middleware_spec.rb
index 410c170..c93c2af 100644
--- a/spec/fail_middleware_spec.rb
+++ b/spec/fail_middleware_spec.rb
@@ -2,7 +2,10 @@
 
 describe Failurous::Rails::FailMiddleware do
   before(:all) do
-    Failurous::Rails.configure(false) { }
+    Failurous::Rails.configure(false) do |config|
+      config.ignore_exceptions << ArgumentError
+    end
+    
     @app = MockApp.new
     @middleware = Failurous::Rails::FailMiddleware.new(@app)
   end
@@ -16,6 +19,15 @@
     Failurous.should_receive(:notify).with(error, kontroller)
     lambda { @middleware.call(env) }.should raise_error(StandardError)
   end
+  
+  it "should not notify of ignored errors, but raise them to upper levels" do
+    error = ArgumentError.new
+    kontroller = mock()
+    @app.should_receive(:call).once().and_raise(error)
+    
+    Failurous.should_not_receive(:notify)
+    lambda { @middleware.call({}) }.should raise_error(ArgumentError)
+  end
 end
 
 class MockApp