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'

2 files changed, 6 insertions, 6 deletions

diff --git a/tests/chown/deref b/tests/chown/deref
index 2d1992c34..aeaf8ee76 100755
--- a/tests/chown/deref
+++ b/tests/chown/deref
@@ -30,7 +30,7 @@ chown --dereference $user dangle 2> out1 && fail=1
 sed 's/: [^:]*$//' out1 > out
 
 cat <<\EOF > exp || fail=1
-chown: cannot dereference `dangle'
+chown: cannot dereference 'dangle'
 EOF
 
 compare exp out || fail=1
diff --git a/tests/chown/preserve-root b/tests/chown/preserve-root
index 69d92d4aa..a9145b7ab 100755
--- a/tests/chown/preserve-root
+++ b/tests/chown/preserve-root
@@ -47,17 +47,17 @@ chown -RLh --preserve-root `id -u` d >> out 2>&1 && fail=1
 chgrp -RLh --preserve-root `id -g` d >> out 2>&1 && fail=1
 
 cat <<\EOF > exp || fail=1
-chown: it is dangerous to operate recursively on `/'
+chown: it is dangerous to operate recursively on '/'
 chown: use --no-preserve-root to override this failsafe
-chgrp: it is dangerous to operate recursively on `/'
+chgrp: it is dangerous to operate recursively on '/'
 chgrp: use --no-preserve-root to override this failsafe
-chmod: it is dangerous to operate recursively on `/'
+chmod: it is dangerous to operate recursively on '/'
 chmod: use --no-preserve-root to override this failsafe
 ==== test -RHh
 ==== test -RLh
-chown: it is dangerous to operate recursively on `d/slink-to-root' (same as `/')
+chown: it is dangerous to operate recursively on 'd/slink-to-root' (same as '/')
 chown: use --no-preserve-root to override this failsafe
-chgrp: it is dangerous to operate recursively on `d/slink-to-root' (same as `/')
+chgrp: it is dangerous to operate recursively on 'd/slink-to-root' (same as '/')
 chgrp: use --no-preserve-root to override this failsafe
 EOF