diff -u expected-show-all-headers actual-show-all-headers
'
+z8=zzzzzzzz
+z64=$z8$z8$z8$z8$z8$z8$z8$z8
+z512=$z64$z64$z64$z64$z64$z64$z64$z64
+test_expect_success 'reject long lines' '
+ rm -f commandline &&
+ cp $patches longline.patch &&
+ echo $z512$z512 >>longline.patch &&
+ ! git send-email \
+ --from="Example <nobody@example.com>" \
+ --to=nobody@example.com \
+ --smtp-server="$(pwd)/fake.sendmail" \
+ $patches longline.patch \
+ 2>errors &&
+ grep longline.patch errors
+'
+
+test_expect_success 'no patch was sent' '
+ ! test -e commandline
+'
+
+test_expect_success 'allow long lines with --no-validate' '
+ git send-email \
+ --from="Example <nobody@example.com>" \
+ --to=nobody@example.com \
+ --smtp-server="$(pwd)/fake.sendmail" \
+ --no-validate \
+ $patches longline.patch \
+ 2>errors
+'
+
test_done