Merge branch 'js/test-modernize-t9300'

Clean up style in an ancient test. * js/test-modernize-t9300: modernize t9300: move test preparations into test_expect_success modernize t9300: mark here-doc words to ignore tab indentation modernize t9300: use test_when_finished for clean-up modernize t9300: wrap lines after && modernize t9300: use test_must_be_empty modernize t9300: use test_must_fail modernize t9300: single-quote placement and indentation