Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/prom-client/lib/metrics/processStartTime.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const Gauge = require('../gauge');
+const startInSeconds = Math.round(Date.now() / 1000 - process.uptime());
+
+const PROCESS_START_TIME = 'process_start_time_seconds';
+
+module.exports = (registry, config = {}) => {
+	const namePrefix = config.prefix ? config.prefix : '';
+	const labels = config.labels ? config.labels : {};
+	const labelNames = Object.keys(labels);
+
+	new Gauge({
+		name: namePrefix + PROCESS_START_TIME,
+		help: 'Start time of the process since unix epoch in seconds.',
+		registers: registry ? [registry] : undefined,
+		labelNames,
+		aggregator: 'omit',
+		collect() {
+			this.set(labels, startInSeconds);
+		},
+	});
+};
+
+module.exports.metricNames = [PROCESS_START_TIME];