test for UTF8 job failure sanitization

thanks to @myronmarston

Author: hone

test/resque_failure_redis_test.rb

@@ -0,0 +1,21 @@
+require 'test_helper'
+require 'resque/failure/redis'
+
+describe Resque::Failure::Redis do
+  let(:bad_string)    { [39, 250, 141, 168, 138, 191, 52, 211, 159, 86, 93, 95, 39].map { |c| c.chr }.join }
+  let(:exception)     { StandardError.exception(bad_string) }
+  let(:worker)        { Resque::Worker.new(:test) }
+  let(:queue)         { "queue" }
+  let(:payload)       { { "class" => Object, "args" => 3 } }
+  let(:redis_backend) { Resque::Failure::Redis.new(exception, worker, queue, payload) }
+
+  it 'cleans up bad strings before saving the failure, in order to prevent errors on the resque UI' do
+    # test assumption: the bad string should not be able to round trip though JSON
+    assert_raises(MultiJson::DecodeError) {
+      MultiJson.decode(MultiJson.encode(bad_string))
+    }
+
+    redis_backend.save
+    Resque::Failure::Redis.all # should not raise an error
+  end
+end