Syntax errors now stop the specs from running

Before it would log an error and keep on going anyway.
The Containment#protect block now throws the symbol that instructs guard
that there was an error and to stop testing.

lib/guard/jruby-rspec/runner.rb

@@ -1,4 +1,5 @@
 require 'rspec'
+require 'guard/jruby-rspec/containment'
 require 'guard/jruby-rspec/formatters/notification_rspec'
 
 module Guard
@@ -44,13 +45,10 @@ def run(paths, options = {})
           # end
         else
           orig_configuration = ::RSpec.configuration
-          begin
+          Containment.new.protect do
             ::RSpec::Core::Runner.run(rspec_arguments(paths, @options))
-          rescue SyntaxError => e
-            UI.error e.message
-          ensure
-            ::RSpec.instance_variable_set(:@configuration, orig_configuration)
           end
+          ::RSpec.instance_variable_set(:@configuration, orig_configuration)
         end
       end
 

spec/guard/jruby-rspec/runner_spec.rb

@@ -28,8 +28,10 @@ class Guard::JRubyRSpec::Runner::UI; end
     context 'when one of the source files is bad' do
       it 'recovers from syntax errors in files by displaying the error' do
         RSpec::Core::Runner.stub(:run).and_raise(SyntaxError.new('Bad Karma'))
-        Guard::JRubyRSpec::Runner::UI.should_receive(:error).with('Bad Karma')
-        subject.run(['spec/foo'])
+        Guard::UI.should_receive(:error).at_least(1).times
+        expect {
+          subject.run(['spec/foo'])
+        }.to throw_symbol(:task_has_failed)
       end
     end
   end