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

node_modules/prom-client/lib/metric.js

@@ -0,0 +1,73 @@
+'use strict';
+
+const Registry = require('./registry');
+const { isObject } = require('./util');
+const { validateMetricName, validateLabelName } = require('./validation');
+
+/**
+ * @abstract
+ */
+class Metric {
+	constructor(config, defaults = {}) {
+		if (!isObject(config)) {
+			throw new TypeError('constructor expected a config object');
+		}
+		Object.assign(
+			this,
+			{
+				labelNames: [],
+				registers: [Registry.globalRegistry],
+				aggregator: 'sum',
+				enableExemplars: false,
+			},
+			defaults,
+			config,
+		);
+		if (!this.registers) {
+			// in case config.registers is `undefined`
+			this.registers = [Registry.globalRegistry];
+		}
+		if (!this.help) {
+			throw new Error('Missing mandatory help parameter');
+		}
+		if (!this.name) {
+			throw new Error('Missing mandatory name parameter');
+		}
+		if (!validateMetricName(this.name)) {
+			throw new Error('Invalid metric name');
+		}
+		if (!validateLabelName(this.labelNames)) {
+			throw new Error('Invalid label name');
+		}
+
+		if (this.collect && typeof this.collect !== 'function') {
+			throw new Error('Optional "collect" parameter must be a function');
+		}
+
+		if (this.labelNames) {
+			this.sortedLabelNames = [...this.labelNames].sort();
+		} else {
+			this.sortedLabelNames = [];
+		}
+
+		this.reset();
+
+		for (const register of this.registers) {
+			if (
+				this.enableExemplars &&
+				register.contentType === Registry.PROMETHEUS_CONTENT_TYPE
+			) {
+				throw new TypeError(
+					'Exemplars are supported only on OpenMetrics registries',
+				);
+			}
+			register.registerMetric(this);
+		}
+	}
+
+	reset() {
+		/* abstract */
+	}
+}
+
+module.exports = { Metric };