Improve logging module (denoland/deno_std#51)

Original: 439885c756

logging/test.ts

@@ -1,53 +1,84 @@
+import { remove, open, readAll } from "deno";
 import { assertEqual, test } from "https://deno.land/x/testing/testing.ts";
 
-import * as logging from "index.ts";
+import * as log from "index.ts";
+import { FileHandler } from "./handlers.ts";
 
 // TODO: establish something more sophisticated
-
 let testOutput = "";
 
-class TestHandler extends logging.handlers.BaseHandler {
-  _log(level, ...args) {
-    testOutput += `${level} ${args[0]}\n`;
+class TestHandler extends log.handlers.BaseHandler {
+  constructor(levelName: string) {
+    super(levelName);
+  }
+
+  log(msg: string) {
+    testOutput += `${msg}\n`;
   }
 }
 
-logging.setup({
-  handlers: {
-    debug: {
-      level: "DEBUG",
-      class: TestHandler
-    },
+test(function testDefaultlogMethods() {
+  log.debug("Foobar");
+  log.info("Foobar");
+  log.warning("Foobar");
+  log.error("Foobar");
+  log.critical("Foobar");
 
-    info: {
-      level: "INFO",
-      class: TestHandler
-    }
-  },
-
-  loggers: {
-    default: {
-      level: "DEBUG",
-      handlers: ["debug"]
-    },
-
-    info: {
-      level: "INFO",
-      handlers: ["info"]
-    }
-  }
+  const logger = log.getLogger('');
+  console.log(logger);
 });
 
-const logger = logging.getLogger("default");
-const unknownLogger = logging.getLogger("info");
+test(async function basicTest() {
+  const testFile = './log.txt';
 
-test(function basicTest() {
-  logger.debug("I should be printed.");
-  unknownLogger.debug("I should not be printed.");
-  unknownLogger.info("And I should be printed as well.");
+  await log.setup({
+    handlers: {
+      debug: new TestHandler("DEBUG"),
+      info: new TestHandler("INFO"),
+      file: new FileHandler("DEBUG", testFile),
+    },
 
+    loggers: {
+      foo: {
+        level: "DEBUG",
+        handlers: ["debug", "file"]
+      },
+
+      bar: {
+        level: "INFO",
+        handlers: ["info"]
+      }
+    }
+  });
+
+  const fooLogger = log.getLogger("foo");
+  const barLogger = log.getLogger("bar");
+  const bazzLogger = log.getLogger("bazz");
+  
+
+  fooLogger.debug("I should be logged.");
+  fooLogger.debug("I should be logged.");
+  barLogger.debug("I should not be logged.");
+  barLogger.info("And I should be logged as well.");
+  bazzLogger.critical("I shouldn't be logged neither.")
+  
   const expectedOutput =
-    "10 I should be printed.\n20 And I should be printed as well.\n";
+    "DEBUG I should be logged.\n" +
+    "DEBUG I should be logged.\n" +
+    "INFO And I should be logged as well.\n";
 
   assertEqual(testOutput, expectedOutput);
+
+  // same check for file handler
+  const f = await open(testFile);
+  const bytes = await readAll(f);
+  const fileOutput = new TextDecoder().decode(bytes);
+  await f.close();
+  await remove(testFile);
+
+  const fileExpectedOutput = 
+    "DEBUG I should be logged.\n" +
+    "DEBUG I should be logged.\n";
+
+  assertEqual(fileOutput, fileExpectedOutput);
 });