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tests: use compare-vs-/dev/null instead of 'test -s'

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When some program produces unexpected output, that use of
compare-vs-/dev/null will ensure that the surprising output is
printed in the test's output.  With "test -s err" only, one
would have to instrument and rerun in order to see the offending
output.

* cfg.mk (sc_prohibit_and_fail_1): Exempt 'compare' from this check.
* tests/dd/misc.sh: Change "tests -s ... || fail=1" to
"compare /dev/null ... && fail=1".
* tests/misc/nice.sh: Likewise.
* tests/rm/read-only.sh: Likewise.
* tests/tail-2/inotify-race.sh: Likewise.
* tests/touch/no-dereference.sh: Likewise.

Suggested by Jim Meyering in
http://lists.gnu.org/archive/html/coreutils/2015-01/msg00042.html
This commit is contained in:
Bernhard Voelker
2015-01-14 17:38:12 +01:00
parent 58cff8a009
commit e84046dbe6
6 changed files with 6 additions and 6 deletions
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2
cfg.mk
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@@ -383,7 +383,7 @@ sc_prohibit_fail_0:
# independently check its contents and thus detect any crash messages.
sc_prohibit_and_fail_1:
@prohibit='&& fail=1' \
exclude='(stat|kill|test |EGREP|grep|env|2> *[^/])' \
exclude='(stat|kill|test |EGREP|grep|env|compare|2> *[^/])' \
halt='&& fail=1 detected. Please use: returns_ 1 ... || fail=1' \
in_vc_files='^tests/' \
$(_sc_search_regexp)

2
tests/dd/misc.sh
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@@ -40,7 +40,7 @@ dd status=noxfer status=none if=$tmp_in of=/dev/null 2> err || fail=1
compare /dev/null err || fail=1
# check later status=noxfer overrides earlier status=none
dd status=none status=noxfer if=$tmp_in of=/dev/null 2> err || fail=1
test -s err || fail=1
compare /dev/null err && fail=1
dd if=$tmp_in of=$tmp_out 2> /dev/null || fail=1
compare $tmp_in $tmp_out || fail=1

2
tests/misc/nice.sh
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@@ -73,7 +73,7 @@ done
if test x$(nice -n -1 nice 2> /dev/null) = x0 ; then
# unprivileged user - warn about failure to change
nice -n -1 true 2> err || fail=1
test -s err || fail=1
compare /dev/null err && fail=1
mv err exp || framework_failure_
nice --1 true 2> err || fail=1
compare exp err || fail=1

2
tests/rm/read-only.sh
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@@ -47,6 +47,6 @@ compare /dev/null out || fail=1
# However, trying to remove an existing file must fail.
rm -f mnt/f > out 2>&1 && fail=1
# with a diagnostic.
test -s out || fail=1
compare /dev/null out && fail=1
Exit $fail

2
tests/tail-2/inotify-race.sh
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@@ -68,6 +68,6 @@ pid=$!
tail --pid=$pid -f tail.out | (read; kill $pid)
test -s tail.out || fail=1
compare /dev/null tail.out && fail=1
Exit $fail

2
tests/touch/no-dereference.sh
View File

@@ -27,7 +27,7 @@ ln -s file link || framework_failure_
# These first tests should work on every platform.
# -h does not create files, but it warns. Use -c to silence warning.
returns_ 1 touch -h no-file 2> err || fail=1
test -s err || fail=1
compare /dev/null err && fail=1
touch -h -c no-file 2> err || fail=1
compare /dev/null err || fail=1