Remove unused variables in tests.

test/test_middleware.rb

@@ -43,7 +43,6 @@ class TestMiddleware < MiniTest::Unit::TestCase
     end
 
     it 'executes middleware in the proper order' do
-      recorder = []
       msg = Sidekiq.dump_json({ 'class' => CustomWorker.to_s, 'args' => [$recorder] })
 
       Sidekiq.server_middleware do |chain|

test/test_stats.rb

@@ -55,7 +55,6 @@ class TestStats < MiniTest::Unit::TestCase
 
         processor = Sidekiq::Processor.new(boss)
 
-        pstr = processor.to_s
         assert_raises RuntimeError do
           processor.process(msg, 'xyzzy')
         end