Merge pull request rails#27984 from kenta-s/remove-unused-variable

Refactor `test_find_by_does_not_use_statement_cache_if_table_name_is_changed`

Author: rafaelfranca

activerecord/test/cases/statement_cache_test.rb

@@ -109,11 +109,11 @@ def test_unprepared_statements_dont_share_a_cache_with_prepared_statements
     def test_find_by_does_not_use_statement_cache_if_table_name_is_changed
       book = Book.create(name: "my book")
 
-      Book.find_by(name: "my book") # warming the statement cache.
+      Book.find_by(name: book.name) # warming the statement cache.
 
       # changing the table name should change the query that is not cached.
       Book.table_name = :birds
-      assert_nil Book.find_by(name: "my book")
+      assert_nil Book.find_by(name: book.name)
     ensure
       Book.table_name = :books
     end