1 files changed, 104 insertions, 0 deletions
diff --git a/log/logger_test.ts b/log/logger_test.ts
new file mode 100644
index 000000000..7a5484105
--- /dev/null
+++ b/log/logger_test.ts
@@ -0,0 +1,104 @@
+import { assertEqual, test } from "../testing/mod.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, datetime: null });
+    super.handle(record);
+  }
+
+  public log(str: string): void {
+    this.messages.push(str);
+  }
+}
+
+test(function simpleLogger() {
+  const handler = new TestHandler("DEBUG");
+  let logger = new Logger("DEBUG");
+
+  assertEqual(logger.level, LogLevel.DEBUG);
+  assertEqual(logger.levelName, "DEBUG");
+  assertEqual(logger.handlers, []);
+
+  logger = new Logger("DEBUG", [handler]);
+
+  assertEqual(logger.handlers, [handler]);
+});
+
+test(function customHandler() {
+  const handler = new TestHandler("DEBUG");
+  const logger = new Logger("DEBUG", [handler]);
+
+  logger.debug("foo", 1, 2);
+
+  assertEqual(handler.records, [
+    {
+      msg: "foo",
+      args: [1, 2],
+      datetime: null,
+      level: LogLevel.DEBUG,
+      levelName: "DEBUG"
+    }
+  ]);
+
+  assertEqual(handler.messages, ["DEBUG foo"]);
+});
+
+test(function logFunctions() {
+  let handler: TestHandler;
+
+  const doLog = (level: string) => {
+    handler = new TestHandler(level);
+    let logger = new Logger(level, [handler]);
+    logger.debug("foo");
+    logger.info("bar");
+    logger.warning("baz");
+    logger.error("boo");
+    logger.critical("doo");
+  };
+
+  doLog("DEBUG");
+
+  assertEqual(handler.messages, [
+    "DEBUG foo",
+    "INFO bar",
+    "WARNING baz",
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  doLog("INFO");
+
+  assertEqual(handler.messages, [
+    "INFO bar",
+    "WARNING baz",
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  doLog("WARNING");
+
+  assertEqual(handler.messages, [
+    "WARNING baz",
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  doLog("ERROR");
+
+  assertEqual(handler.messages, [
+    "ERROR boo",
+    "CRITICAL doo"
+  ]);
+
+  doLog("CRITICAL");
+
+  assertEqual(handler.messages, [
+    "CRITICAL doo"
+  ]);
+});