adds tests and handles more scenarios

src/tests/middleware.spec.js

@@ -1,39 +1,114 @@
 import middleware from '../middleware';
 import mockExpress from 'jest-mock-express';
+import language from '../middleware/language';
 
 let res = null;
 let next = null;
-
-beforeEach(() => {
-  res = mockExpress.response();
-  next = jest.fn();
-});
-
-describe('Payload Role Middleware', () => {
-  it('Exact role - authorized', () => {
-    const req = {
-      user: {
-        role: 'user'
-      }
-    };
-
-    middleware.role('user')(req, res, next);
-
-    expect(next).toHaveBeenCalledTimes(1);
-    expect(res.status).not.toHaveBeenCalled();
+describe('Payload Middleware', () => {
+  beforeEach(() => {
+    res = mockExpress.response();
+    next = jest.fn();
   });
 
-  it('Exact role - unauthorized', () => {
-    const req = {
-      user: {
-        role: 'user'
-      }
-    };
 
-    middleware.role('admin')(req, res, next);
+  describe('Payload Role Middleware', () => {
+    it('Exact role - authorized', () => {
+      const req = {
+        user: {
+          role: 'user'
+        }
+      };
 
-    expect(next).not.toHaveBeenCalled();
-    expect(res.status).toHaveBeenCalled();
-    expect(res.send).toHaveBeenCalled();
+      middleware.role('user')(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(res.status).not.toHaveBeenCalled();
+    });
+
+    it('Exact role - unauthorized', () => {
+      const req = {
+        user: {
+          role: 'user'
+        }
+      };
+
+      middleware.role('admin')(req, res, next);
+
+      expect(next).not.toHaveBeenCalled();
+      expect(res.status).toHaveBeenCalled();
+      expect(res.send).toHaveBeenCalled();
+    });
+
+  });
+
+  describe('Payload Language Middleware', () => {
+
+    let req, localization;
+
+    beforeEach(() => {
+      req = {
+        query: {},
+        headers: {}
+      };
+      localization = {
+        languages: ['en', 'es'],
+        defaultLanguage: 'en'
+      };
+
+    });
+
+    it('Supports query params', () => {
+      req.query.lang = 'es';
+
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual(req.query.lang);
+    });
+
+    it('Supports query param fallback to default', () => {
+      req.query.lang = 'pt';
+
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual(localization.defaultLanguage);
+    });
+
+    it('Supports accept language header', () => {
+      req.headers['accept-language'] = 'es,fr;';
+
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual('es');
+    });
+
+    it('Supports accept language header fallback', () => {
+      req.query.lang = 'pt';
+      req.headers['accept-language'] = 'fr;';
+
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual(localization.defaultLanguage);
+    });
+
+    it('Query param takes precedence over header', () => {
+      req.query.lang = 'es';
+      req.headers['accept-language'] = 'en;';
+
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual('es');
+    });
+
+    it('Supports default language', () => {
+      language(localization)(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(req.language).toEqual(localization.defaultLanguage);
+    });
   });
 });