Fix constant reference

Update the long key handling test so it triggers truncation in the Redis cache store.

2 files changed, 2 insertions, 3 deletions

diff --git a/activesupport/lib/active_support/cache/redis_cache_store.rb b/activesupport/lib/active_support/cache/redis_cache_store.rb
index 6cc45f5284..e7f015bff5 100644
--- a/activesupport/lib/active_support/cache/redis_cache_store.rb
+++ b/activesupport/lib/active_support/cache/redis_cache_store.rb
@@ -368,7 +368,7 @@ module ActiveSupport
 
         def truncate_key(key)
           if key.bytesize > max_key_bytesize
-            suffix = ":sha2:#{Digest::SHA2.hexdigest(key)}"
+            suffix = ":sha2:#{::Digest::SHA2.hexdigest(key)}"
             truncate_at = max_key_bytesize - suffix.bytesize
             "#{key.byteslice(0, truncate_at)}#{suffix}"
           else
diff --git a/activesupport/test/cache/behaviors/cache_store_behavior.rb b/activesupport/test/cache/behaviors/cache_store_behavior.rb
index bdc689b8b4..ac37ab6e61 100644
--- a/activesupport/test/cache/behaviors/cache_store_behavior.rb
+++ b/activesupport/test/cache/behaviors/cache_store_behavior.rb
@@ -309,8 +309,7 @@ module CacheStoreBehavior
   end
 
   def test_really_long_keys
-    key = "".dup
-    900.times { key << "x" }
+    key = "x" * 2048
     assert @cache.write(key, "bar")
     assert_equal "bar", @cache.read(key)
     assert_equal "bar", @cache.fetch(key)