Fix test flakiness introduced in encryption tests

activerecord/test/cases/encryption/encryption_schemes_test.rb

@@ -179,6 +179,6 @@ def declare_class_with_global_previous_encryption_schemes(*previous_schemes)
         self.table_name = "authors"
 
         encrypts :name
-      end
+      end.tap { |klass| klass.type_for_attribute(:name) }
     end
 end

activerecord/test/cases/encryption/helper.rb

@@ -152,6 +152,16 @@ def assert_slower_by_at_most(threshold_factor, baseline:, baseline_label: BASELI
   end
 end
 
+# We eager load encrypted attribute types as they are declared, so that they pick up the
+# default encryption setup for tests. Because we load those lazily when used, this prevents
+# side effects where some tests modify encryption config settings affecting others.
+#
+# Notice that we clear the declaration listeners when each test start, so this will only affect
+# the classes loaded before tests starts, not those declared during tests.
+ActiveRecord::Encryption.on_encrypted_attribute_declared do |klass, attribute_name|
+  klass.type_for_attribute(attribute_name)
+end
+
 class ActiveRecord::EncryptionTestCase < ActiveRecord::TestCase
   include ActiveRecord::Encryption::EncryptionHelpers, ActiveRecord::Encryption::PerformanceHelpers