Logging module

lib/log.js

@@ -0,0 +1,20 @@
+const {createLogger, format, transports} = require('winston')
+
+module.exports = (file) => {
+    const logger = createLogger({
+        format: format.combine(
+            format.timestamp({format:'YYYY-MM-DD HH:mm:ss'}),
+            format.label({
+                label: file
+            }),
+            format.colorize(),
+            format.printf(
+                info => `${info.timestamp} ${info.level} [${info.label}]: ${info.message}`
+            )
+        ),
+        transports : [
+            new transports.Console()
+        ]
+    })
+    return logger        
+}

lib/log.test.js

@@ -0,0 +1,27 @@
+jest.mock('winston')
+const winston = require('winston')
+winston.createLogger = jest.fn().mockImplementation(() => {
+    return {
+        error: () => {},
+        warn: () => {},
+        info: () => {}
+    }
+})
+winston.format = {
+    combine: () => {},
+    timestamp: () => {},
+    label: () => {},
+    colorize: () => {},
+    printf: () => {}
+}
+winston.transports.Console = function(){}
+
+describe('Testing log.js', () => {
+    beforeEach(() => {
+        jest.clearAllMocks()
+    })
+    it('should call winston.createLogger when log is required', () => {
+        const logger = require('./log')(__filename)
+        expect(winston.createLogger).toHaveBeenCalled()
+    })
+})

package.json

@@ -23,15 +23,16 @@
     "pm2": "^4.2.3"
   },
   "dependencies": {
-    "pg": "^8.0.0"
+    "pg": "^8.0.0",
+    "winston": "^3.2.1"
   },
   "jest": {
-    "coverageThreshold":{
-      "global":{
+    "coverageThreshold": {
+      "global": {
         "branches": 100,
         "functions": 100,
         "lines": 100,
-        "statements": 100 
+        "statements": 100
       }
     }
   },