1 files changed, 105 insertions, 0 deletions
diff --git a/std/log/test.ts b/std/log/test.ts
new file mode 100644
index 000000000..5a17f9a35
--- /dev/null
+++ b/std/log/test.ts
@@ -0,0 +1,105 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { test } from "../testing/mod.ts";
+import { assertEquals } from "../testing/asserts.ts";
+import * as log from "./mod.ts";
+import { LogLevel } from "./levels.ts";
+
+class TestHandler extends log.handlers.BaseHandler {
+  public messages: string[] = [];
+
+  log(msg: string): void {
+    this.messages.push(msg);
+  }
+}
+
+test(async function defaultHandlers(): Promise<void> {
+  const loggers: {
+    [key: string]: (msg: string, ...args: unknown[]) => void;
+  } = {
+    DEBUG: log.debug,
+    INFO: log.info,
+    WARNING: log.warning,
+    ERROR: log.error,
+    CRITICAL: log.critical
+  };
+
+  for (const levelName in LogLevel) {
+    if (levelName === "NOTSET") {
+      continue;
+    }
+
+    const logger = loggers[levelName];
+    const handler = new TestHandler(levelName);
+
+    await log.setup({
+      handlers: {
+        default: handler
+      },
+      loggers: {
+        default: {
+          level: levelName,
+          handlers: ["default"]
+        }
+      }
+    });
+
+    logger("foo");
+    logger("bar", 1, 2);
+
+    assertEquals(handler.messages, [`${levelName} foo`, `${levelName} bar`]);
+  }
+});
+
+test(async function getLogger(): Promise<void> {
+  const handler = new TestHandler("DEBUG");
+
+  await log.setup({
+    handlers: {
+      default: handler
+    },
+    loggers: {
+      default: {
+        level: "DEBUG",
+        handlers: ["default"]
+      }
+    }
+  });
+
+  const logger = log.getLogger();
+
+  assertEquals(logger.levelName, "DEBUG");
+  assertEquals(logger.handlers, [handler]);
+});
+
+test(async function getLoggerWithName(): Promise<void> {
+  const fooHandler = new TestHandler("DEBUG");
+
+  await log.setup({
+    handlers: {
+      foo: fooHandler
+    },
+    loggers: {
+      bar: {
+        level: "INFO",
+        handlers: ["foo"]
+      }
+    }
+  });
+
+  const logger = log.getLogger("bar");
+
+  assertEquals(logger.levelName, "INFO");
+  assertEquals(logger.handlers, [fooHandler]);
+});
+
+test(async function getLoggerUnknown(): Promise<void> {
+  await log.setup({
+    handlers: {},
+    loggers: {}
+  });
+
+  const logger = log.getLogger("nonexistent");
+
+  assertEquals(logger.levelName, "NOTSET");
+  assertEquals(logger.handlers, []);
+});