jest integration, few tests (#3)

* jest integration, few tests

* improved test coverage

package.json

@@ -6,6 +6,12 @@
   "dependencies": {
     "jsonwebtoken": "7.3.0"
   },
+  "devDependencies": {
+    "jest": "^18.1.0"
+  },
+  "scripts": {
+    "test": "jest"
+  },
   "main": "index.js",
   "license": "MIT",
   "repository": {

test/index.test.js

@@ -0,0 +1,69 @@
+'use strict'
+
+const jwtAuth = require('../index')
+
+test('error throwed if secret undefined', () => {
+  expect(
+    () => jwtAuth()()
+  ).toThrow('micro-jwt-auth must me initialized passing a secret to decode incoming JWT token')
+});
+
+test('case of request has not authorization header', () => {
+
+  const request = {
+    headers: {}
+  }
+
+  const response = {
+    writeHead: jest.fn().mockImplementation(),
+    end: jest.fn().mockImplementation()
+  };
+
+  const result = jwtAuth('mySecret')()(request, response)
+
+  expect(result).toBeUndefined()
+  expect(response.writeHead).toHaveBeenCalledWith(401)
+  expect(response.end).toHaveBeenCalledWith('missing Authorization header')
+});
+
+test('that all works fine: no errors', () => {
+
+  const request = {
+    headers: {
+      authorization: 'Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IldhbHRlciBXaGl0ZSIsImFkbWluIjp0cnVlfQ.YyF_yOQsTSQghvM08WBp7VhsHRv-4Ir4eMQvsEycY1A'
+    }
+  }
+
+  const response = {
+    writeHead: jest.fn().mockImplementation(),
+    end: jest.fn().mockImplementation()
+  };
+
+  const result = jwtAuth('mySecret')(() => 'Good job!')(request, response)
+
+  expect(result).toEqual('Good job!')
+  expect(response.writeHead).toHaveBeenCalledTimes(0)
+  expect(response.end).toHaveBeenCalledTimes(0)
+
+})
+
+test('wrong bearer case', () => {
+
+  const request = {
+    headers: {
+      authorization: 'Bearer wrong.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IldhbHRlciBXaGl0ZSIsImFkbWluIjp0cnVlfQ.YyF_yOQsTSQghvM08WBp7VhsHRv-4Ir4eMQvsEycY1A'
+    }
+  }
+
+  const response = {
+    writeHead: jest.fn().mockImplementation(),
+    end: jest.fn().mockImplementation()
+  };
+
+  const result = jwtAuth('mySecret')(() => {})(request, response)
+
+  expect(result).toBeUndefined()
+  expect(response.writeHead).toHaveBeenCalledWith(401)
+  expect(response.end).toHaveBeenCalledWith('invalid token in Authorization header')
+
+})