feat(std/log): inline and deferred statement resolution logging (#5192)

1 files changed, 26 insertions, 2 deletions

diff --git a/std/log/mod_test.ts b/std/log/mod_test.ts
index 30576011b..21b944fb5 100644
--- a/std/log/mod_test.ts
+++ b/std/log/mod_test.ts
@@ -1,8 +1,8 @@
 // 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";
-import { assert } from "../testing/asserts.ts";
-import { getLogger } from "./mod.ts";
 
 let logger: Logger | null = null;
 try {
@@ -16,3 +16,27 @@ try {
 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");
+});