[PATCH] tests: fix incorrect `|| fail` pattern in tests

[Pádraig Brady]

* tests/ls/stat-free-symlinks.sh: s/|| fail/|| fail=1/.
* tests/misc/tee.sh: Likewise.
* tests/touch/relative.sh: Likewise.
* cfg.mk (sc_prohibit_or_fail): A new syntax-check to avoid this.
---
 cfg.mk                         | 8 ++++++++
 tests/ls/stat-free-symlinks.sh | 2 +-
 tests/misc/tee.sh              | 2 +-
 tests/touch/relative.sh        | 2 +-
 4 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/cfg.mk b/cfg.mk
index c9b8c7af5..bb0960a26 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -519,6 +519,14 @@ sc_prohibit_and_fail_1:
        in_vc_files='^tests/'                                           \
          $(_sc_search_regexp)
 
+# Ensure that tests don't use `cmd ... || fail` as that's a noop.
+sc_prohibit_or_fail:
+       @prohibit='\|\| fail$$'                                         \
+       exclude=':#'                                                    \
+       halt='|| fail detected. Please use: || fail=1'                  \
+       in_vc_files='^tests/'                                           \
+         $(_sc_search_regexp)
+
 # Ensure that env vars are not passed through returns_ as
 # that was seen to fail on FreeBSD /bin/sh at least
 sc_prohibit_env_returns:
diff --git a/tests/ls/stat-free-symlinks.sh b/tests/ls/stat-free-symlinks.sh
index c538a1c51..a786145db 100755
--- a/tests/ls/stat-free-symlinks.sh
+++ b/tests/ls/stat-free-symlinks.sh
@@ -32,7 +32,7 @@ ln -s x link-to-x || framework_failure_
 # symlink and an executable file properly.
 
 LS_COLORS='or=0:mi=0:ex=01;32:ln=01;35' \
-  strace -qe stat ls -F --color=always x link-to-x > out.tmp 2> err || fail
+  strace -qe stat ls -F --color=always x link-to-x > out.tmp 2> err || fail=1
 # Elide info messages strace can send to stdout of the form:
 #   [ Process PID=1234 runs in 32 bit mode. ]
 sed '/Process PID=/d' out.tmp > out
diff --git a/tests/misc/tee.sh b/tests/misc/tee.sh
index f8774787a..d5b3e555b 100755
--- a/tests/misc/tee.sh
+++ b/tests/misc/tee.sh
@@ -37,7 +37,7 @@ done
 tee - <sample >out 2>err || fail=1
 compare sample ./- || fail=1
 compare sample out || fail=1
-compare /dev/null err || fail
+compare /dev/null err || fail=1
 
 # Ensure tee exits early if no more writable outputs
 if test -w /dev/full && test -c /dev/full; then
diff --git a/tests/touch/relative.sh b/tests/touch/relative.sh
index 215807f0e..74924e2d1 100755
--- a/tests/touch/relative.sh
+++ b/tests/touch/relative.sh
@@ -26,7 +26,7 @@ TZ=UTC0 touch --date='2004-01-16 12:00 +0000' f || 
framework_failure_
 # Set times back by 5 days.
 touch --ref f --date='-5 days' f || fail=1
 
-TZ=UTC0 ls -og --time-style=+%Y-%m-%d f > out.1 || fail
+TZ=UTC0 ls -og --time-style=+%Y-%m-%d f > out.1 || fail=1
 sed 's/ f$//;s/.* //' out.1 > out
 
 cat <<\EOF > exp || framework_failure_
-- 
2.24.1