tests: use $(...) consistently

* tests/backref.sh: Use `...' instead of ``...'' in comments.
* tests/bre.awk: Use $(...) instead of `...`.
* tests/ere.awk: Use $(...) instead of `...`.
* tests/euc-mb: Use $(...) instead of `...`.
* tests/fmbtest: Use $(...) instead of `...`.
* tests/foad1: Use $(...) instead of `...`.
* tests/pcre-z: Use $(...) instead of `...`.  Quote output of grep.
* tests/spencer1-locale.awk: Use $(...) instead of `...`.
* tests/spencer1.awk: Use $(...) instead of `...`.
* tests/yesno.sh: Use $(...) instead of `...`.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/pcre-z b/tests/pcre-z
index 17d9f955..f59c1faa 100755
--- a/tests/pcre-z
+++ b/tests/pcre-z
@@ -14,7 +14,7 @@ grep -z "$REGEX" in > exp 2>err || fail_ 'Cannot do BRE (grep -z) match.'
 compare err /dev/null || fail_ 'stderr not empty on grep -z.'
 
 # Sanity check the output
-test `grep -cz "$REGEX" in` 2>err = 3 || fail_ 'Incorrect BRE (grep -cz) match.'
+test "$(grep -cz "$REGEX" in)" 2>err = 3 || fail_ 'Incorrect BRE (grep -cz) match.'
 compare err /dev/null || fail_ 'stderr not empty on grep -cz.'
 
 fail=0