t0070: test that git_mkstemps correctly checks return value of open()

Signed-off-by: Dale R. Worley <worley@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0070-fundamental.sh

@@ -25,6 +25,10 @@ test_expect_success POSIXPERM 'mktemp to unwritable directory prints filename' '
 	grep "cannotwrite/test" err
 '
 
+test_expect_success 'git_mkstemps_mode does not fail if fd 0 is not open' '
+	git commit --allow-empty -m message <&-
+'
+
 test_expect_success 'check for a bug in the regex routines' '
 	# if this test fails, re-build git with NO_REGEX=1
 	test-regex