test: add complete coverage for the logger module

Author: thinkjrs

test/index.spec.ts

@@ -2,13 +2,22 @@ import { logger } from '../src/index';
 
 describe('Logger', () => {
   let consoleLogSpy: jest.SpyInstance;
+  let consoleWarnSpy: jest.SpyInstance;
+  let consoleErrorSpy: jest.SpyInstance;
+  let consoleDebugSpy: jest.SpyInstance;
 
   beforeEach(() => {
     consoleLogSpy = jest.spyOn(console, 'log').mockImplementation();
+    consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation();
+    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation();
+    consoleDebugSpy = jest.spyOn(console, 'debug').mockImplementation();
   });
 
   afterEach(() => {
     consoleLogSpy.mockRestore();
+    consoleWarnSpy.mockRestore();
+    consoleErrorSpy.mockRestore();
+    consoleDebugSpy.mockRestore();
   });
 
   it("should log a message when NODE_ENV is not 'production'", () => {
@@ -30,4 +39,64 @@ describe('Logger', () => {
 
     expect(consoleLogSpy).not.toHaveBeenCalled();
   });
+
+  it("should warn a message when NODE_ENV is not 'production'", () => {
+    process.env.NODE_ENV = 'development';
+    const message = 'Test warn message';
+
+    logger.warn(message);
+
+    expect(consoleWarnSpy).toHaveBeenCalledWith(
+      expect.stringMatching(/\[WARN\] .*: Test warn message/)
+    );
+  });
+
+  it("should not warn a message when NODE_ENV is 'production'", () => {
+    process.env.NODE_ENV = 'production';
+    const message = 'Test warn message';
+
+    logger.warn(message);
+
+    expect(consoleWarnSpy).not.toHaveBeenCalled();
+  });
+
+  it("should error a message when NODE_ENV is not 'production'", () => {
+    process.env.NODE_ENV = 'development';
+    const message = 'Test error message';
+
+    logger.error(message);
+
+    expect(consoleErrorSpy).toHaveBeenCalledWith(
+      expect.stringMatching(/\[ERROR\] .*: Test error message/)
+    );
+  });
+
+  it("should not error a message when NODE_ENV is 'production'", () => {
+    process.env.NODE_ENV = 'production';
+    const message = 'Test error message';
+
+    logger.error(message);
+
+    expect(consoleErrorSpy).not.toHaveBeenCalled();
+  });
+
+  it("should debug a message when NODE_ENV is not 'production'", () => {
+    process.env.NODE_ENV = 'development';
+    const message = 'Test debug message';
+
+    logger.debug(message);
+
+    expect(consoleDebugSpy).toHaveBeenCalledWith(
+      expect.stringMatching(/\[DEBUG\] .*: Test debug message/)
+    );
+  });
+
+  it("should not debug a message when NODE_ENV is 'production'", () => {
+    process.env.NODE_ENV = 'production';
+    const message = 'Test debug message';
+
+    logger.debug(message);
+
+    expect(consoleDebugSpy).not.toHaveBeenCalled();
+  });
 });