test: prevent null pointer exception in teardown method for testing

Author: supercaracal

test/benchmark_mixin.rb

@@ -10,7 +10,7 @@ def setup
   end
 
   def teardown
-    @client.call('FLUSHDB')
+    @client&.call('FLUSHDB')
     wait_for_replication
     @client&.close
   end
@@ -74,7 +74,7 @@ def bench_pipeline_get
   def wait_for_replication
     client_side_timeout = TEST_TIMEOUT_SEC + 1.0
     server_side_timeout = (TEST_TIMEOUT_SEC * 1000).to_i
-    @client.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
+    @client&.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
   end
 end
 
@@ -87,7 +87,7 @@ def setup
   end
 
   def teardown
-    @cluster_client.call('FLUSHDB')
+    @cluster_client&.call('FLUSHDB')
     wait_for_replication
     @cluster_client&.close
     @client&.close
@@ -102,6 +102,6 @@ def new_cluster_client
   def wait_for_replication
     client_side_timeout = TEST_TIMEOUT_SEC + 1.0
     server_side_timeout = (TEST_TIMEOUT_SEC * 1000).to_i
-    @cluster_client.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
+    @cluster_client&.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
   end
 end

test/redis_client/cluster/test_normalized_cmd_name.rb

@@ -11,7 +11,7 @@ def setup
       end
 
       def teardown
-        @subject.clear
+        @subject&.clear
       end
 
       def test_get_by_command

test/redis_client/test_cluster.rb

@@ -253,7 +253,7 @@ def test_compatibility_with_redis_gem
       def wait_for_replication
         client_side_timeout = TEST_TIMEOUT_SEC + 1.0
         server_side_timeout = (TEST_TIMEOUT_SEC * 1000).to_i
-        @client.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
+        @client&.blocking_call(client_side_timeout, 'WAIT', TEST_REPLICA_SIZE, server_side_timeout)
       end
     end
 

test/test_against_cluster_broken.rb

@@ -20,8 +20,8 @@ def setup
   end
 
   def teardown
-    @client.close
-    @controller.close
+    @client&.close
+    @controller&.close
   end
 
   def test_a_replica_is_down

test/test_against_cluster_state.rb

@@ -17,8 +17,8 @@ def setup
     end
 
     def teardown
-      @controller.close
-      @client.close
+      @controller&.close
+      @client&.close
     end
 
     def test_the_state_of_cluster_down

test/test_concurrency.rb

@@ -13,7 +13,7 @@ def setup
   end
 
   def teardown
-    @client.close
+    @client&.close
   end
 
   def test_forking