perf tests timechart: Add a perf timechart test

Basic coverage for `perf timechart` doing a record and then a basic
sanity test of the generated SVG file.

Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/tests/shell/timechart.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+# perf timechart tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_timechart_test.perf.data.XXXXX)
+output=$(mktemp /tmp/__perf_timechart_test.output.XXXXX.svg)
+
+cleanup() {
+	rm -f "${perfdata}"
+	rm -f "${output}"
+	trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+	echo "Unexpected signal in ${FUNCNAME[1]}"
+	cleanup
+	exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+test_timechart() {
+	echo "Basic perf timechart test"
+
+	# Try to record timechart data.
+	# perf timechart record uses system-wide recording and specific tracepoints.
+	# If it fails (e.g. permissions, missing tracepoints), skip the test.
+	if ! perf timechart record -o "${perfdata}" true > /dev/null 2>&1; then
+		echo "Basic perf timechart test [Skipped: perf timechart record failed (permissions/events?)]"
+		return
+	fi
+
+	# Generate the timechart
+	if ! perf timechart -i "${perfdata}" -o "${output}" > /dev/null 2>&1; then
+		echo "Basic perf timechart test [Failed: perf timechart command failed]"
+		err=1
+		return
+	fi
+
+	# Check if output file exists and is not empty
+	if [ ! -s "${output}" ]; then
+		echo "Basic perf timechart test [Failed: output file is empty or missing]"
+		err=1
+		return
+	fi
+
+	# Check if it looks like an SVG
+	if ! grep -q "svg" "${output}"; then
+		echo "Basic perf timechart test [Failed: output doesn't look like SVG]"
+		err=1
+		return
+	fi
+
+	echo "Basic perf timechart test [Success]"
+}
+
+if ! perf check feature -q libtraceevent ; then
+	echo "perf timechart is not supported. Skip."
+        cleanup
+	exit 2
+fi
+
+test_timechart
+cleanup
+exit $err