Tweak the rest of the script to more closely follow the test
style guide. Guarding setup commands with test_expect_success
makes it easy to see the scope in which some particular data is
used; removal of whitespace after >redirection operators is just
for consistency.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>