test: enable skipped test cases (#228)

Author: supercaracal

test/redis_client/test_cluster.rb

@@ -219,11 +219,6 @@ def test_global_pubsub_without_timeout
       end
 
       def test_global_pubsub_with_multiple_channels
-        if hiredis_used?
-          skip('FIXME: SEGV occured if using hiredis driver')
-          return
-        end
-
         sub = Fiber.new do |pubsub|
           pubsub.call('SUBSCRIBE', *Array.new(10) { |i| "g-chan#{i}" })
           got = collect_messages(pubsub, size: 10).sort_by { |e| e[1].to_s }
@@ -287,11 +282,6 @@ def test_sharded_pubsub_with_multiple_channels
           return
         end
 
-        if hiredis_used?
-          skip('FIXME: SEGV occured if using hiredis driver')
-          return
-        end
-
         sub = Fiber.new do |pubsub|
           10.times { |i| pubsub.call('SSUBSCRIBE', "s-chan#{i}") }
           got = collect_messages(pubsub, size: 10).sort_by { |e| e[1].to_s }