tests: change `...' to '...' on lines not matching /[=\$]/

Exempt lines with '$' or '=', since those are prone to improper
conversion.  Run this:
  git grep -l "\`[^']*'" tests \
   |xargs perl -pi -e '/[=\$]/ and next;s/\`([^'\''"]*?'\'')/'\''$1/g'

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/tail-2/F-vs-rename b/tests/tail-2/F-vs-rename
index 7967296a2..53bc00dd3 100755
--- a/tests/tail-2/F-vs-rename
+++ b/tests/tail-2/F-vs-rename
@@ -41,12 +41,12 @@ tail_re='^x$' retry_delay_ check_tail_output .1 7 || fail=1
 mv a b || fail=1
 
 # Wait 6.3s for this diagnostic:
-# tail: `a' has become inaccessible: No such file or directory
+# tail: 'a' has become inaccessible: No such file or directory
 tail_re='inaccessible' retry_delay_ check_tail_output .1 7 || fail=1
 
 echo x > a
 # Wait up to 6.3s for this to appear in the output:
-# "tail: `...' has appeared;  following end of new file"
+# "tail: '...' has appeared;  following end of new file"
 tail_re='has appeared' retry_delay_ check_tail_output .1 7 ||
   { echo "$0: a: unexpected delay?"; cat out; fail=1; }