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

node_modules/prom-client/lib/exemplar.js

@@ -0,0 +1,37 @@
+'use strict';
+
+/**
+ * Class representing an OpenMetrics exemplar.
+ *
+ * @property {object} labelSet
+ * @property {number} value
+ * @property {number} [timestamp]
+ * */
+class Exemplar {
+	constructor(labelSet = {}, value = null) {
+		this.labelSet = labelSet;
+		this.value = value;
+	}
+
+	/**
+	 * Validation for the label set format.
+	 * https://github.com/OpenObservability/OpenMetrics/blob/d99b705f611b75fec8f450b05e344e02eea6921d/specification/OpenMetrics.md#exemplars
+	 *
+	 * @param {object} labelSet - Exemplar labels.
+	 * @throws {RangeError}
+	 * @return {void}
+	 */
+	validateExemplarLabelSet(labelSet) {
+		let res = '';
+		for (const [labelName, labelValue] of Object.entries(labelSet)) {
+			res += `${labelName}${labelValue}`;
+		}
+		if (res.length > 128) {
+			throw new RangeError(
+				'Label set size must be smaller than 128 UTF-8 chars',
+			);
+		}
+	}
+}
+
+module.exports = Exemplar;