perf test: Workaround debug output in list test

Write the JSON output to a specific file to avoid debug output
breaking it.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Ross Zwisler <zwisler@chromium.org>
Cc: Shirisha G <shirisha@linux.ibm.com>
Link: https://lore.kernel.org/r/20240124043015.1388867-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/list.sh

@@ -3,17 +3,32 @@
 # SPDX-License-Identifier: GPL-2.0
 
 set -e
-err=0
 
 shelldir=$(dirname "$0")
 # shellcheck source=lib/setup_python.sh
 . "${shelldir}"/lib/setup_python.sh
 
+list_output=$(mktemp /tmp/__perf_test.list_output.json.XXXXX)
+
+cleanup() {
+  rm -f "${list_output}"
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
 test_list_json() {
   echo "Json output test"
-  perf list -j | $PYTHON -m json.tool
+  perf list -j -o "${list_output}"
+  $PYTHON -m json.tool "${list_output}"
   echo "Json output test [Success]"
 }
 
 test_list_json
-exit $err
+cleanup
+exit 0