t7004: do not prepare things outside test_expect_success

t7004: do not prepare things outside test_expect_success

Do not prepare expect and other things outside test_expect_success.
If such code fails for some reason, we won't necessarily hear about
it in a timely fashion (or perhaps at all). By placing all code inside
`test_expect_success` it ensures that we know immediately if it fails.

Also add '\' before EOF to avoid shell interpolation and '-' to allow
indentation of the body.

Signed-off-by: AbdAlRahman Gad <abdobngad@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>