Fix tests.sh verbose output redirection

tests/entrypoint.sh

@@ -68,14 +68,15 @@ for file in $test_files; do
     if [ -z "$VERBOSE" ]; then
         output="$TMPDIR/$file.log"
         mkdir -p "$(dirname "$output")"
+        exec 3>"$output"
     else
-        output=/dev/stdout
+        exec 3>&1
     fi
 
     (
         export TEST_CASE_FILE="$file"
 
-        if ! $SHELL -e -x "$root/cases/$file" >"$output" 2>&1; then
+        if ! $SHELL -e -x "$root/cases/$file" >&3 2>&1; then
             echo "$file FAILED"
             if [ -z "$VERBOSE" ]; then
                 echo "output of test is as follows"