add uri perf test, #50800this calls toString and toJSON uris of all files in our src folder

src/vs/base/test/node/uri.test.perf.ts

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import * as assert from 'assert';
+import URI from 'vs/base/common/uri';
+import { readFileSync } from 'fs';
+
+suite('URI - perf', function () {
+
+	let manyFileUris: URI[];
+	setup(function () {
+		manyFileUris = [];
+		let data = readFileSync(URI.parse(require.toUrl('./uri.test.data.txt')).fsPath).toString();
+		let lines = data.split('\n');
+		for (let line of lines) {
+			manyFileUris.push(URI.file(line));
+		}
+	});
+
+	function perfTest(name: string, callback: Function) {
+		test(name, _done => {
+			let t1 = Date.now();
+			callback();
+			let d = Date.now() - t1;
+			console.log(`${name} took ${d}ms (${(d / manyFileUris.length).toPrecision(3)} ms/uri)`);
+			_done();
+		});
+	}
+
+	perfTest('toString', function () {
+		for (const uri of manyFileUris) {
+			let data = uri.toString();
+			assert.ok(data);
+		}
+	});
+
+	perfTest('toString(skipEncoding)', function () {
+		for (const uri of manyFileUris) {
+			let data = uri.toString(true);
+			assert.ok(data);
+		}
+	});
+
+	perfTest('toJSON', function () {
+		for (const uri of manyFileUris) {
+			let data = uri.toJSON();
+			assert.ok(data);
+		}
+	});
+
+});