1 files changed, 93 insertions, 0 deletions
diff --git a/std/log/logger_test.ts b/std/log/logger_test.ts
new file mode 100644
index 000000000..d8d205c08
--- /dev/null
+++ b/std/log/logger_test.ts
@@ -0,0 +1,93 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { test } from "../testing/mod.ts";
+import { assertEquals } from "../testing/asserts.ts";
+import { LogRecord, Logger } from "./logger.ts";
+import { LogLevel } from "./levels.ts";
+import { BaseHandler } from "./handlers.ts";
+
+class TestHandler extends BaseHandler {
+  public messages: string[] = [];
+  public records: LogRecord[] = [];
+
+  handle(record: LogRecord): void {
+    this.records.push({ ...record });
+    super.handle(record);
+  }
+
+  public log(str: string): void {
+    this.messages.push(str);
+  }
+}
+
+test(function simpleLogger(): void {
+  const handler = new TestHandler("DEBUG");
+  let logger = new Logger("DEBUG");
+
+  assertEquals(logger.level, LogLevel.DEBUG);
+  assertEquals(logger.levelName, "DEBUG");
+  assertEquals(logger.handlers, []);
+
+  logger = new Logger("DEBUG", [handler]);
+
+  assertEquals(logger.handlers, [handler]);
+});
+
+test(function customHandler(): void {
+  const handler = new TestHandler("DEBUG");
+  const logger = new Logger("DEBUG", [handler]);
+
+  logger.debug("foo", 1, 2);
+
+  const record = handler.records[0];
+  assertEquals(record.msg, "foo");
+  assertEquals(record.args, [1, 2]);
+  assertEquals(record.level, LogLevel.DEBUG);
+  assertEquals(record.levelName, "DEBUG");
+
+  assertEquals(handler.messages, ["DEBUG foo"]);
+});
+
+test(function logFunctions(): void {
+  const doLog = (level: string): TestHandler => {
+    const handler = new TestHandler(level);
+    const logger = new Logger(level, [handler]);
+    logger.debug("foo");
+    logger.info("bar");
+    logger.warning("baz");
+    logger.error("boo");
+    logger.critical("doo");
+    return handler;
+  };
+
+  let handler: TestHandler;
+  handler = doLog("DEBUG");
+
+  assertEquals(handler.messages, [
+    "DEBUG foo",
+    "INFO bar",
+    "WARNING baz",
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  handler = doLog("INFO");
+
+  assertEquals(handler.messages, [
+    "INFO bar",
+    "WARNING baz",
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  handler = doLog("WARNING");
+
+  assertEquals(handler.messages, ["WARNING baz", "ERROR boo", "CRITICAL doo"]);
+
+  handler = doLog("ERROR");
+
+  assertEquals(handler.messages, ["ERROR boo", "CRITICAL doo"]);
+
+  handler = doLog("CRITICAL");
+
+  assertEquals(handler.messages, ["CRITICAL doo"]);
+});