fix(ruby): preserve special characters in rfind filenames (#14173)

plugins/ruby/tests/rfind.test.zsh

@@ -0,0 +1,32 @@
+#!/usr/bin/env zsh
+
+emulate -LR zsh
+
+source "${1:-${0:A:h:h}/ruby.plugin.zsh}"
+
+test_dir=$(mktemp -d) || exit 1
+trap 'command rm -rf -- "$test_dir"' EXIT
+
+typeset -i failures=0 tests=0
+typeset filename output
+
+for filename in plain.rb 'file with spaces.rb' "single'quote.rb" 'double"quote.rb' $'line\nbreak.rb' 'unicode-ą.rb'; do
+  print -r -- 'needle' >| "$test_dir/$filename"
+  output=$(cd "$test_dir" && rfind needle 2> "$test_dir/stderr")
+  actual_status=$?
+  (( tests++ ))
+
+  if [[ $actual_status == 0 && $output == '1:needle' && ! -s "$test_dir/stderr" ]]; then
+    print -r -- "PASS: ${(qqq)filename}"
+  else
+    print -u2 -r -- "FAIL: ${(qqq)filename} (status $actual_status)"
+    print -u2 -r -- "  stdout: ${(qqq)output}"
+    print -u2 -r -- "  stderr: $(<"$test_dir/stderr")"
+    (( failures++ ))
+  fi
+
+  command rm -- "$test_dir/$filename"
+done
+
+print -r -- "$tests tests, $failures failures"
+(( failures == 0 ))