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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.const { test } = Deno;import { assert, assertEquals } from "../testing/asserts.ts";import { getLogger, debug, info, warning, error, critical } from "./mod.ts";import { Logger } from "./logger.ts";
let logger: Logger | null = null;try {  // Need to initialize it here  // otherwise it will be already initialized on Deno.test  logger = getLogger();} catch {  // Pass}
test("logger is initialized", function (): void {  assert(logger instanceof Logger);});
test("default loggers work as expected", function (): void {  const sym = Symbol("a");  const debugData: string = debug("foo");  const debugResolver: string | undefined = debug(() => "foo");  const infoData: number = info(456, 1, 2, 3);  const infoResolver: boolean | undefined = info(() => true);  const warningData: symbol = warning(sym);  const warningResolver: null | undefined = warning(() => null);  const errorData: undefined = error(undefined, 1, 2, 3);  const errorResolver: bigint | undefined = error(() => 5n);  const criticalData: string = critical("foo");  const criticalResolver: string | undefined = critical(() => "bar");  assertEquals(debugData, "foo");  assertEquals(debugResolver, undefined);  assertEquals(infoData, 456);  assertEquals(infoResolver, true);  assertEquals(warningData, sym);  assertEquals(warningResolver, null);  assertEquals(errorData, undefined);  assertEquals(errorResolver, 5n);  assertEquals(criticalData, "foo");  assertEquals(criticalResolver, "bar");});