Implement external checks test

lib/brakeman/report/report_hash.rb

@@ -16,6 +16,7 @@ class Brakeman::Report::Hash < Brakeman::Report::Base
     end
 
     report[:config] = tracker.config
+    report[:checks_run] = tracker.checks.checks_run
 
     report
   end

test/tests/rails4.rb

 abort "Please run using test/test.rb" unless defined? BrakemanTester
 
 EXTERNAL_CHECKS_PATH = File.expand_path(File.join(File.dirname(__FILE__), "..", "/apps/rails4/external_checks"))
-Rails4 = BrakemanTester.run_scan "rails4", "Rails 4", {additional_checks_path: [EXTERNAL_CHECKS_PATH]}
+Rails4 = BrakemanTester.run_scan "rails4", "Rails 4", {:additional_checks_path => [EXTERNAL_CHECKS_PATH]}
 
 class Rails4Tests < Test::Unit::TestCase
   include BrakemanTester::FindWarning
@@ -583,7 +583,10 @@ class Rails4Tests < Test::Unit::TestCase
       :user_input => nil
   end
 
+  #Verify checks external to Brakeman are loaded
   def test_external_checks
-    # TODO: check for external check class being loaded here
+    assert defined? Brakeman::CheckExternalCheckTest
+    #Initial "Check" removed from check names
+    assert report[:checks_run].include? "ExternalCheckTest"
   end
 end