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std/log/formatters_test.ts

The Deno Standard Library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import { assertEquals } from "../assert/mod.ts";import { FakeTime } from "../testing/time.ts";import { jsonFormatter } from "./formatters.ts";import { LogRecord } from "./logger.ts";
const log = (msg: string, args: unknown[] = []) =>  new LogRecord({    msg,    args,    level: 20,    loggerName: "user-logger",  });
Deno.test("jsonFormatter() handles messages without arguments", function () {  using _time = new FakeTime(1);
  assertEquals(    jsonFormatter(log("msg")),    `{"level":"INFO","datetime":1,"message":"msg"}`,  );});
Deno.test("jsonFormatter() handles messages with one arguments", function () {  using _time = new FakeTime(1);
  assertEquals(    jsonFormatter(log("msg", [{ user: "Dave" }])),    `{"level":"INFO","datetime":1,"message":"msg","args":{"user":"Dave"}}`,  );});
Deno.test("jsonFormatter() handles messages with many arguments", function () {  using _time = new FakeTime(1);
  assertEquals(    jsonFormatter(log("msg", [1, true, null, [], {}])),    `{"level":"INFO","datetime":1,"message":"msg","args":[1,true,null,[],{}]}`,  );});