import { Logger } from "../../src/utils/logger";
describe("Logger", () => {
let logger: Logger;
beforeEach(() => {
// Reset singleton instance
(Logger as any).instance = null;
logger = Logger.getInstance("debug");
// Mock console methods
jest.spyOn(console, "debug").mockImplementation();
jest.spyOn(console, "info").mockImplementation();
jest.spyOn(console, "warn").mockImplementation();
jest.spyOn(console, "error").mockImplementation();
});
afterEach(() => {
jest.restoreAllMocks();
});
describe("getInstance", () => {
it("should return a singleton instance", () => {
const instance1 = Logger.getInstance();
const instance2 = Logger.getInstance();
expect(instance1).toBe(instance2);
});
it("should initialize with provided log level", () => {
const debugLogger = Logger.getInstance("debug");
expect(debugLogger).toBeDefined();
});
});
describe("setLogLevel", () => {
it("should update the log level", () => {
logger.setLogLevel("warn");
logger.debug("debug message");
logger.info("info message");
logger.warn("warn message");
expect(console.debug).not.toHaveBeenCalled();
expect(console.info).not.toHaveBeenCalled();
expect(console.warn).toHaveBeenCalled();
});
});
describe("logging methods", () => {
beforeEach(() => {
logger.setLogLevel("debug");
});
it("should log debug messages", () => {
logger.debug("test debug message");
expect(console.debug).toHaveBeenCalledWith(
expect.stringMatching(/\[.*\] \[DEBUG\] test debug message/)
);
});
it("should log info messages", () => {
logger.info("test info message");
expect(console.info).toHaveBeenCalledWith(
expect.stringMatching(/\[.*\] \[INFO\] test info message/)
);
});
it("should log warn messages", () => {
logger.warn("test warn message");
expect(console.warn).toHaveBeenCalledWith(
expect.stringMatching(/\[.*\] \[WARN\] test warn message/)
);
});
it("should log error messages", () => {
logger.error("test error message");
expect(console.error).toHaveBeenCalledWith(
expect.stringMatching(/\[.*\] \[ERROR\] test error message/)
);
});
it("should include metadata in log messages", () => {
const metadata = { key: "value", number: 42 };
logger.info("test message with metadata", metadata);
expect(console.info).toHaveBeenCalledWith(
expect.stringMatching(
/\[.*\] \[INFO\] test message with metadata {"key":"value","number":42}/
)
);
});
});
describe("log level filtering", () => {
it("should not log messages below the current level", () => {
logger.setLogLevel("warn");
logger.debug("debug message");
logger.info("info message");
logger.warn("warn message");
logger.error("error message");
expect(console.debug).not.toHaveBeenCalled();
expect(console.info).not.toHaveBeenCalled();
expect(console.warn).toHaveBeenCalled();
expect(console.error).toHaveBeenCalled();
});
it("should log all messages when level is debug", () => {
logger.setLogLevel("debug");
logger.debug("debug message");
logger.info("info message");
logger.warn("warn message");
logger.error("error message");
expect(console.debug).toHaveBeenCalled();
expect(console.info).toHaveBeenCalled();
expect(console.warn).toHaveBeenCalled();
expect(console.error).toHaveBeenCalled();
});
});
});
