Merge pull request #140 from DigitalProductInnovationAndDevelopment/dev_tests_trixi

Added some more tests on front- and backend

Author: udenizz

backend/_test_/publications-api.test.js

@@ -0,0 +1,58 @@
+const request = require('supertest');
+const express = require('express');
+const axios = require('axios');
+const publicationsRouter = require('../routes/publications');
+
+// Mock the axios module
+jest.mock('axios');
+
+const app = express();
+// Mount the router to a path
+app.use('/api/publications', publicationsRouter);
+
+describe('Backend API: /api/publications', () => {
+
+  afterEach(() => {
+    // Clear all mocks after each test
+    jest.clearAllMocks();
+  });
+
+  describe('GET /api/publications/search', () => {
+
+    // Test for Async Logic Handling and Data Transformation
+    it('should return successfully with formatted data when OpenAlex API call succeeds', async () => {
+      const mockApiResponse = {
+        data: {
+          results: [
+            { id: 'W123', display_name: 'Test Publication 1', cited_by_count: 50 },
+            { id: 'W456', display_name: 'Test Publication 2' /* missing cited_by_count */ },
+          ],
+          meta: { count: 2 },
+        },
+      };
+      axios.get.mockResolvedValue(mockApiResponse);
+
+      const response = await request(app).get('/api/publications/search?filter=test');
+
+      expect(response.status).toBe(200);
+      expect(response.body.results).toHaveLength(2);
+      // Check that data transformation (adding citation_count) works correctly
+      expect(response.body.results[0]).toHaveProperty('citation_count', 50);
+      expect(response.body.results[1]).toHaveProperty('citation_count', 0); // Check for default value
+    });
+
+    // Test for Error Handling Middleware
+    it('should return a 500 error when the OpenAlex API call fails', async () => {
+      const errorMessage = 'Network Error';
+      axios.get.mockRejectedValue({ message: errorMessage });
+
+      const response = await request(app).get('/api/publications/search?filter=test');
+
+      expect(response.status).toBe(500);
+      expect(response.body).toEqual({
+        error: 'Failed to fetch from OpenAlex API',
+        details: errorMessage,
+      });
+    });
+  });
+}); 

backend/_test_/routes.test.js

@@ -0,0 +1,40 @@
+const request = require('supertest');
+const express = require('express');
+const publicationsRouter = require('../routes/publications');
+
+// Setup a minimal express app for testing
+const app = express();
+app.use('/api/publications', publicationsRouter);
+
+describe('Backend API Routes', () => {
+
+  // Test #1: Route Handler Returns Expected Response
+  describe('GET /api/publications', () => {
+    it('should return a 200 OK status and a valid JSON response for the base route', async () => {
+      const response = await request(app).get('/api/publications');
+      expect(response.status).toBe(200);
+      expect(response.headers['content-type']).toMatch(/json/);
+      expect(response.body).toBeDefined();
+    });
+  });
+
+  // Test #2: Validation Middleware Works
+  describe('GET /api/publications/search', () => {
+    it('should return a 400 Bad Request for invalid page parameters', async () => {
+      const response = await request(app)
+        .get('/api/publications/search?filter=title.search:test&page=invalid-page-number');
+      
+      expect(response.status).toBe(400);
+      expect(response.body).toEqual({ error: 'Invalid page number provided.' });
+    });
+  });
+
+  // Test #3: Error Handling for Non-existent Routes
+  describe('GET /api/non-existent-route', () => {
+    it('should return a 404 Not Found for routes that do not exist', async () => {
+      const response = await request(app).get('/api/this-route-does-not-exist');
+      expect(response.status).toBe(404);
+    });
+  });
+
+});