tests: use "returns_" rather than explicit comparison with "$?"

* tests/sjis-mb (encode): Rearrange to emit desired input into
a file, rather than piping directly into grep.  That permits
the use of returns_ 1 to verify timeout's exit status.
* tests/euc-mb: Use "returns_ 1" rather than testing $? = 1
* tests/char-class-multibyte: Likewise.
* tests/dfa-heap-overrun: Likewise.
* tests/encoding-error: Likewise.
* tests/fedora: Likewise.
* tests/grep-dev-null: Likewise.
* tests/init.cfg (envvar_check_fail): Likewise.
* tests/kwset-abuse: Likewise.
* tests/mb-non-UTF8-overrun: Likewise.
* tests/multibyte-white-space: Likewise.
* tests/pcre-infloop: Likewise.
* tests/surrogate-pair: Likewise.
* tests/warn-char-classes: Likewise.
Do the same for other values:
* tests/backref-multibyte-slow: Likewise.
* tests/euc-mb: Likewise.
* tests/pcre-abort: Likewise.
* tests/pcre-jitstack: Likewise.
* tests/repetition-overflow: Likewise.
* tests/reversed-range-endpoints: Likewise.
* tests/warn-char-classes: Likewise.

tests/backref-multibyte-slow

@@ -25,8 +25,8 @@ test $max_seconds = 1 && max_seconds=5
 
 for LOC in en_US.UTF-8; do
   out=out-$LOC
-  LC_ALL=$LOC timeout ${max_seconds}s grep -aE '^([a-z]).\1$' in > $out 2>&1
-  test $? = 0 || fail=1
+  LC_ALL=$LOC timeout ${max_seconds}s grep -aE '^([a-z]).\1$' in > $out 2>&1 \
+    || fail=1
   compare $out in || fail=1
 done
 

tests/char-class-multibyte

@@ -24,8 +24,7 @@ done
 
 for LOC in en_US.UTF-8 $LOCALE_FR_UTF8; do
   out=out3-$LOC
-  printf '\303\n' | LC_ALL=$LOC grep '[é]' > $out
-  test $? = 1 || fail=1
+  printf '\303\n' | LC_ALL=$LOC returns_ 1 grep '[é]' > $out || fail=1
 done
 
 Exit $fail

tests/dfa-heap-overrun

@@ -20,7 +20,6 @@
 
 fail=0
 
-grep -E '(^| )*(a|b)*(c|d)*( |$)' < /dev/null
-test $? = 1 || fail=1
+returns_ 1 grep -E '(^| )*(a|b)*(c|d)*( |$)' < /dev/null || fail=1
 
 Exit $fail

tests/encoding-error

@@ -31,8 +31,7 @@ compare exp out || fail=1
 grep '^J' in >out || fail=1
 compare j out || fail=1
 
-grep '^X' in >out
-test $? = 1 || fail=1
+returns_ 1 grep '^X' in >out || fail=1
 compare /dev/null out || fail=1
 
 grep . in >out || fail=1

tests/euc-mb

@@ -38,11 +38,10 @@ make_input BABA |euc_grep AB && fail=1
 make_input BABAAB |euc_grep AB > out || fail=1
 make_input BABAAB > exp || framework_failure_
 compare exp out || fail=1
-make_input BABABA |euc_grep AB; test $? = 1 || fail=1
-make_input BABABA |euc_grep '^x\|AB'; test $? = 1 || fail=1
+make_input BABABA |returns_ 1 euc_grep AB || fail=1
+make_input BABABA |returns_ 1 euc_grep '^x\|AB' || fail=1
 
 # -P supports only unibyte and UTF-8 locales.
-LC_ALL=$locale grep -P x /dev/null
-test $? = 2 || fail=1
+LC_ALL=$locale returns_ 2 grep -P x /dev/null || fail=1
 
 Exit $fail

tests/fedora

@@ -52,18 +52,16 @@ if ( timeout --version ) > /dev/null 2>&1; then
 
   U=https://bugzilla.redhat.com/show_bug.cgi?id=189580
   printf 'grep -D skip opening a special file: '
-  timeout 10 grep -D skip foo /dev/zero
-  test $? = 124 && fail || ok
+  returns_ 124 timeout 10 grep -D skip foo /dev/zero && fail || ok
 
   U=https://bugzilla.redhat.com/show_bug.cgi?id=169524
   printf 'grep -Fw looping infinitely: '
-  echo foobar | timeout 10 grep -Fw ""
-  test $? = 124 && fail || ok
+  echo foobar | returns_ 124 timeout 10 grep -Fw "" && fail || ok
 
   U=https://bugzilla.redhat.com/show_bug.cgi?id=140781
   printf 'fgrep hangs on binary files: '
-  timeout 10 grep -F grep "$abs_top_builddir/src/grep" >/dev/null
-  test $? = 124 && fail || ok
+  returns_ 124 timeout 10 grep -F grep "$abs_top_builddir/src/grep" \
+    > /dev/null && fail || ok
 
 fi
 

tests/grep-dev-null

@@ -7,14 +7,14 @@ require_en_utf8_locale_
 LC_ALL=en_US.UTF-8
 export LC_ALL
 
-echo x | grep -f /dev/null; test $? = 1 || fail=1
-echo x | grep -if /dev/null; test $? = 1 || fail=1
-echo x | grep -Ff /dev/null; test $? = 1 || fail=1
-echo x | grep -Fif /dev/null; test $? = 1 || fail=1
+echo x | returns_ 1 grep -f /dev/null || fail=1
+echo x | returns_ 1 grep -if /dev/null || fail=1
+echo x | returns_ 1 grep -Ff /dev/null || fail=1
+echo x | returns_ 1 grep -Fif /dev/null || fail=1
 
-grep -f /dev/null < /dev/null; test $? = 1 || fail=1
-grep -if /dev/null < /dev/null; test $? = 1 || fail=1
-grep -Ff /dev/null < /dev/null; test $? = 1 || fail=1
-grep -Fif /dev/null < /dev/null; test $? = 1 || fail=1
+returns_ 1 grep -f /dev/null < /dev/null || fail=1
+returns_ 1 grep -if /dev/null < /dev/null || fail=1
+returns_ 1 grep -Ff /dev/null < /dev/null || fail=1
+returns_ 1 grep -Fif /dev/null < /dev/null || fail=1
 
 Exit $fail

tests/init.cfg

@@ -41,7 +41,7 @@ require_timeout_()
 {
   ( timeout 10s true ) > /dev/null 2>&1 \
     || skip_ your system lacks the timeout program
-  timeout 10s false; test $? = 1 \
+  returns_ 1 timeout 10s false \
     || skip_ your system has a non-GNU timeout program
 }
 

tests/kwset-abuse

@@ -25,8 +25,7 @@ fail=0
 # with gdb showed a reallocation slightly larger than that in fillbuf.
 # To reach the buggy code, the needle must have length < 1/11 that of
 # the haystack, and 10,000 is a nice round number that fits the bill.
-printf '%0260000dXy\n' 0 | grep -F $(printf %010000dy 0)
-
-test $? = 1 || fail=1
+printf '%0260000dXy\n' 0 | returns_ 1 grep -F $(printf %010000dy 0) \
+  || fail=1
 
 Exit $fail

tests/mb-non-UTF8-overrun

@@ -24,7 +24,6 @@ fail=0
 
 # This would fail when running an ASAN-enabled binary, or when run via
 # valgrind, accessing one byte beyond the end of an input buffer.
-grep -z . < /dev/null
-test $? = 1 || fail=1
+returns_ 1 grep -z . < /dev/null || fail=1
 
 Exit $fail

tests/multibyte-white-space

@@ -83,8 +83,7 @@ for i in $utf8_space_characters; do
 
   hex_printf_ "$i" | grep -q '^\s$' \
       || { warn_ " $m: \\s failed to match $i in the $LC_ALL locale"; fail; }
-  hex_printf_ "$i" | grep -q '\S'
-  test $? = 1 \
+  hex_printf_ "$i" | returns_ 1 grep -q '\S' \
       || { warn_ " $m: \\S mistakenly matched $i in the $LC_ALL locale"; fail; }
 done
 
@@ -94,8 +93,7 @@ done
 # match_mb_charset function) that would have otherwise been untouched.
 # However, as of the change-set adding this new test, match_mb_charset
 # is unreachable via grep.
-printf '\0' | grep -aE '^\s?$' > out 2>&1
-test $? = 1 || fail=1
+printf '\0' | returns_ 1 grep -aE '^\s?$' > out 2>&1 || fail=1
 compare /dev/null out
 
 Exit $fail

tests/pcre-abort

@@ -14,8 +14,7 @@ require_pcre_
 fail=0
 
 echo aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab > in || framework_failure_
-grep -P '((a+)*)+$' in > out
-test $? = 2 || fail=1
+returns_ 2 grep -P '((a+)*)+$' in > out || fail=1
 compare /dev/null out || fail=1
 
 Exit $fail

tests/pcre-infloop

@@ -27,7 +27,7 @@ printf 'a\201b\r' > in || framework_failure_
 
 fail=0
 
-LC_ALL=en_US.UTF-8 timeout 10 grep -P 'a.?..b' in
-test $? = 1 || fail_ "libpcre's match function appears to infloop"
+LC_ALL=en_US.UTF-8 returns_ 1 timeout 10 grep -P 'a.?..b' in \
+  || fail_ "libpcre's match function appears to infloop"
 
 Exit $fail

tests/pcre-jitstack

@@ -52,8 +52,8 @@ if test $? != 1; then
 
     # Rerun that same test, but now with no limit on stack size:
     (ulimit -s unlimited;
-     LC_ALL=C grep -P -n '^([/](?!/)|[^/])*~/.*' pcrejit.txt)
-    test $? = 1 || fail=1
+     LC_ALL=C returns_ 1 grep -P -n '^([/](?!/)|[^/])*~/.*' pcrejit.txt) \
+       || fail=1
 fi
 
 Exit $fail

tests/repetition-overflow

@@ -11,9 +11,9 @@ fail=0
 # range of "unsigned int" would silently wrap around.   Hence, 2^32+1
 # would be treated just like "1", and both of these would mistakenly match.
 
-echo abc  | grep -E "b{$xp1}"   > out 2> /dev/null; test $? = 2 || fail=1
+echo abc  | returns_ 2 grep -E "b{$xp1}"   > out 2> /dev/null || fail=1
 compare /dev/null out || fail=1
-echo abbc | grep -E "b{1,$xp2}" > out 2> /dev/null; test $? = 2 || fail=1
+echo abbc | returns_ 2 grep -E "b{1,$xp2}" > out 2> /dev/null || fail=1
 compare /dev/null out || fail=1
 
 Exit $fail

tests/reversed-range-endpoints

@@ -6,9 +6,8 @@ fail=0
 
 printf 'Invalid range end\n' > exp
 for prog in grep 'grep -E'; do
-  $prog '[b-a]' < /dev/null > out 2>&1
   # exit status must be 2, not 1
-  test $? = 2 || fail=1
+  returns_ 2 $prog '[b-a]' < /dev/null > out 2>&1 || fail=1
 
   # Remove "$prog: " prefix from actual output.
   sed 's/^[grep]*: //' out > k && mv k out

tests/sjis-mb

@@ -29,10 +29,10 @@ test -n "$locale" || skip_ 'SJIS locale not found'
 k=0
 test_grep_reject() {
   k=$(expr $k + 1)
-  encode "$2" | \
-    LC_ALL=$locale \
-      timeout 10s grep $1 $(encode "$3") > out$k 2>&1
-  test $? = 1 && compare /dev/null out$k
+  encode "$2" > in || return 1
+  LC_ALL=$locale \
+    returns_ 1 timeout 10s grep $1 $(encode "$3") in >out$k 2>&1 \
+      && compare /dev/null out$k
 }
 
 test_grep() {

tests/surrogate-pair

@@ -29,9 +29,8 @@ LC_ALL=en_US.UTF-8
 export LC_ALL
 
 # On Cygwin, before grep-2.15, this would segfault.
-grep -i anything-else in > out 2>&1
 # Require not just non-zero exit status, but exactly 1.
-test $? = 1 || fail=1
+returns_ 1 grep -i anything-else in > out 2>&1 || fail=1
 # Expect no output.
 compare /dev/null out || fail=1
 

tests/warn-char-classes

@@ -10,38 +10,30 @@ printf 'grep: character class syntax is [[:space:]], not [:space:]\n' \
 
 # basic cases
 
-grep '[:space:]' x 2> err
-test $? = 2 || fail=1
+returns_ 2 grep '[:space:]' x 2> err || fail=1
 sed 's/^\([A-Za-z]:\)\{0,1\}[^: ]*: /grep: /' err > err1 && mv err1 err
 compare exp-err err || fail=1
 
-grep '[[:space:]]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[[:space:]]' x 2> err || fail=1
 test -s err && fail=1
 
 # disabled by POSIXLY_CORRECT
-POSIXLY_CORRECT=yes grep '[:space:]' x 2> err
-test $? = 1 || fail=1
+POSIXLY_CORRECT=yes returns_ 1 grep '[:space:]' x 2> err || fail=1
 test -s err && fail=1
 
 # patterns that are considered valid
-grep '[::]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[::]' x 2> err || fail=1
 test -s err && fail=1
 
-grep '[:space]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[:space]' x 2> err || fail=1
 test -s err && fail=1
 
-grep '[:space:wxyz]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[:space:wxyz]' x 2> err || fail=1
 test -s err && fail=1
 
-grep '[:space[:space:]:]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[:space[:space:]:]' x 2> err || fail=1
 test -s err && fail=1
 
-grep '[:spac-e:]' x 2> err
-test $? = 1 || fail=1
+returns_ 1 grep '[:spac-e:]' x 2> err || fail=1
 test -s err && fail=1
 Exit $fail