This fixes the following warning.

```
test/caching_test.rb:986: warning: parentheses after method name is interpreted as
test/caching_test.rb:986: warning: an argument list, not a decomposed argument

test/cases/adapters/mysql2/reserved_word_test.rb:146: warning: parentheses after method name is interpreted as
test/cases/adapters/mysql2/reserved_word_test.rb:146: warning: an argument list, not a decomposed argument
```

Ref: https://github.com/ruby/ruby/commit/65e27c8b138d6959608658ffce2fa761842b8d24