Storage service tests and benches in ts/test-mock

ts/test-mock/benchmarks/fixtures.ts

@@ -0,0 +1,67 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+/* eslint-disable no-await-in-loop, no-console */
+
+import createDebug from 'debug';
+
+export const debug = createDebug('mock:benchmarks');
+
+export { Bootstrap } from '../bootstrap';
+export { App } from '../playwright';
+
+export type StatsType = {
+  mean: number;
+  stddev: number;
+  [key: string]: number;
+};
+
+export const RUN_COUNT = process.env.RUN_COUNT
+  ? parseInt(process.env.RUN_COUNT, 10)
+  : 100;
+
+export const GROUP_SIZE = process.env.GROUP_SIZE
+  ? parseInt(process.env.GROUP_SIZE, 10)
+  : 8;
+
+export const DISCARD_COUNT = process.env.DISCARD_COUNT
+  ? parseInt(process.env.DISCARD_COUNT, 10)
+  : 5;
+
+export function stats(
+  list: ReadonlyArray<number>,
+  percentiles: ReadonlyArray<number> = []
+): StatsType {
+  if (list.length === 0) {
+    throw new Error('Empty list given to stats');
+  }
+
+  let mean = 0;
+  let stddev = 0;
+
+  for (const value of list) {
+    mean += value;
+    stddev += value ** 2;
+  }
+  mean /= list.length;
+  stddev /= list.length;
+
+  stddev -= mean ** 2;
+  stddev = Math.sqrt(stddev);
+
+  const sorted = list.slice().sort((a, b) => a - b);
+
+  const result: StatsType = { mean, stddev };
+
+  for (const p of percentiles) {
+    result[`p${p}`] = sorted[Math.floor((sorted.length * p) / 100)];
+  }
+
+  return result;
+}
+
+// Can happen if electron exits prematurely
+process.on('unhandledRejection', reason => {
+  console.error('Unhandled rejection:');
+  console.error(reason);
+  process.exit(1);
+});