diff --git a/activerecord/test/cases/adapters/mysql2/connection_test.rb b/activerecord/test/cases/adapters/mysql2/connection_test.rb
index c1de2218e2..bae283a048 100644
--- a/activerecord/test/cases/adapters/mysql2/connection_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/connection_test.rb
@@ -66,9 +66,10 @@ class Mysql2ConnectionTest < ActiveRecord::Mysql2TestCase
   def test_execute_after_disconnect
     @connection.disconnect!
 
-    assert_raise(ActiveRecord::StatementInvalid) do
+    error = assert_raise(ActiveRecord::StatementInvalid) do
       @connection.execute("SELECT 1")
     end
+    assert_kind_of Mysql2::Error, error.cause
   end
 
   def test_quote_after_disconnect