Add new LogManager module

packages/log-manager/tests/log-manager.test.ts

@@ -0,0 +1,94 @@
+// FILEPATH: /home/jessew/Dev/lysand/packages/log-manager/log-manager.test.ts
+import { LogManager, LogLevel } from "../index";
+import type fs from "fs/promises";
+import {
+	describe,
+	it,
+	beforeEach,
+	expect,
+	jest,
+	mock,
+	type Mock,
+	test,
+} from "bun:test";
+import type { BunFile } from "bun";
+
+describe("LogManager", () => {
+	let logManager: LogManager;
+	let mockOutput: BunFile;
+	let mockAppend: Mock<typeof fs.appendFile>;
+
+	beforeEach(async () => {
+		mockOutput = Bun.file("test.log");
+		mockAppend = jest.fn();
+		await mock.module("fs/promises", () => ({
+			appendFile: mockAppend,
+		}));
+		logManager = new LogManager(mockOutput);
+	});
+
+	it("should initialize and write init log", () => {
+		expect(mockAppend).toHaveBeenCalledWith(
+			mockOutput.name,
+			expect.stringContaining("--- INIT LogManager at")
+		);
+	});
+
+	it("should log message with timestamp", async () => {
+		await logManager.log(LogLevel.INFO, "TestEntity", "Test message");
+		expect(mockAppend).toHaveBeenCalledWith(
+			mockOutput.name,
+			expect.stringContaining("[INFO] TestEntity: Test message")
+		);
+	});
+
+	it("should log message without timestamp", async () => {
+		await logManager.log(
+			LogLevel.INFO,
+			"TestEntity",
+			"Test message",
+			false
+		);
+		expect(mockAppend).toHaveBeenCalledWith(
+			mockOutput.name,
+			"[INFO] TestEntity: Test message\n"
+		);
+	});
+
+	test.skip("should write to stdout", async () => {
+		logManager = new LogManager(Bun.stdout);
+		await logManager.log(LogLevel.INFO, "TestEntity", "Test message");
+
+		const writeMock = jest.fn();
+
+		await mock.module("Bun", () => ({
+			stdout: Bun.stdout,
+			write: writeMock,
+		}));
+
+		expect(writeMock).toHaveBeenCalledWith(
+			Bun.stdout,
+			expect.stringContaining("[INFO] TestEntity: Test message")
+		);
+	});
+
+	it("should throw error if output file does not exist", () => {
+		mockAppend.mockImplementationOnce(() => {
+			return Promise.reject(
+				new Error("Output file doesnt exist (and isnt stdout)")
+			);
+		});
+		expect(
+			logManager.log(LogLevel.INFO, "TestEntity", "Test message")
+		).rejects.toThrow(Error);
+	});
+
+	it("should log error message", async () => {
+		const error = new Error("Test error");
+		await logManager.logError(LogLevel.ERROR, "TestEntity", error);
+		expect(mockAppend).toHaveBeenCalledWith(
+			mockOutput.name,
+			expect.stringContaining("[ERROR] TestEntity: Test error")
+		);
+	});
+});