Add logging module (denoland/deno_std#33)

Original: https://github.com/denoland/deno_std/commit/25b88bcf8c260865d2b6b68f539c4772bac095ee

1 files changed, 53 insertions, 0 deletions

diff --git a/logging/test.ts b/logging/test.ts
new file mode 100644
index 000000000..365064cbf
--- /dev/null
+++ b/logging/test.ts
@@ -0,0 +1,53 @@
+import { assertEqual, test } from "https://deno.land/x/testing/testing.ts";
+
+import * as logging from "index.ts";
+
+// TODO: establish something more sophisticated
+
+let testOutput = "";
+
+class TestHandler extends logging.handlers.BaseHandler {
+  _log(level, ...args) {
+    testOutput += `${level} ${args[0]}\n`;
+  }
+}
+
+logging.setup({
+  handlers: {
+    debug: {
+      level: "DEBUG",
+      class: TestHandler
+    },
+
+    info: {
+      level: "INFO",
+      class: TestHandler
+    }
+  },
+
+  loggers: {
+    default: {
+      level: "DEBUG",
+      handlers: ["debug"]
+    },
+
+    info: {
+      level: "INFO",
+      handlers: ["info"]
+    }
+  }
+});
+
+const logger = logging.getLogger("default");
+const unknownLogger = logging.getLogger("info");
+
+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.");
+
+  const expectedOutput =
+    "10 I should be printed.\n20 And I should be printed as well.\n";
+
+  assertEqual(testOutput, expectedOutput);
+});