1 files changed, 6 insertions, 0 deletions
diff --git a/activesupport/test/cache/stores/redis_cache_store_test.rb b/activesupport/test/cache/stores/redis_cache_store_test.rb
index 375993a632..dda96b68fb 100644
--- a/activesupport/test/cache/stores/redis_cache_store_test.rb
+++ b/activesupport/test/cache/stores/redis_cache_store_test.rb
@@ -95,6 +95,12 @@ module ActiveSupport::Cache::RedisCacheStoreTests
       end
     end
 
+    test "instance of Redis uses given instance" do
+      redis_instance = Redis.new
+      @cache = build(redis: redis_instance)
+      assert_same @cache.redis, redis_instance
+    end
+
     private
       def build(**kwargs)
         ActiveSupport::Cache::RedisCacheStore.new(driver: DRIVER, **kwargs).tap do |cache|