initial commit

backend/tests/app.test.js

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+const request = require('supertest');
+const path = require('path');
+const fs = require('fs');
+const os = require('os');
+const { app } = require('../src/app');
+const services = require('../src/services');
+jest.mock('../src/services'); // jest uses fake/dummy functions instead of the real ones
+
+describe('POST /api/documents', () => {
+  let dummyFileExcel;
+  let dummyFilePdf;
+  beforeAll(() => {
+    dummyFileExcel = path.join(os.tmpdir(), 'test_file.xlsx');
+    dummyFilePdf = path.join(os.tmpdir(), 'test_file.pdf');
+
+    fs.writeFileSync(dummyFileExcel, 'dummy file excel content');
+    fs.writeFileSync(dummyFilePdf, 'dummy pdf file content');
+  });
+
+  afterAll(() => {
+    if (fs.existsSync(dummyFileExcel)) fs.unlinkSync(dummyFileExcel);
+    if (fs.existsSync(dummyFilePdf)) fs.unlinkSync(dummyFilePdf);
+  });
+
+  it('should process files and return status 200 when helpers succeed', async() => {
+    // this tells the fake functions what to return
+    services.splitExcelFile.mockResolvedValue(5); // Returns 5 rows
+    services.splitPDF.mockResolvedValue(['/tmp/page1.pdf']); // Returns 1 temp file
+    services.initializeSalesforceConnection.mockResolvedValue(); // Simulates success
+    services.attachPdfToAccount.mockResolvedValue(); // Simulates success
+
+    // this makes test request to Express
+    const response = await request(app)
+      .post('/api/documents')
+      .field('title', 'Quarterly Report')
+      .attach('documents', dummyFileExcel)
+      .attach('documents', dummyFilePdf);
+
+      // assertions => verify express responded properly and called our service
+    expect(response.statusCode).toBe(200);
+    expect(response.body).toEqual({
+      ok: true,
+      message: 'Files uploaded successfully!'
+    });
+
+    // Verify helpers were actually called
+    expect(services.splitExcelFile).toHaveBeenCalledTimes(1);
+    expect(services.splitPDF).toHaveBeenCalledTimes(1);
+    expect(services.initializeSalesforceConnection).toHaveBeenCalledTimes(1);
+    expect(services.cleanUp).toHaveBeenCalledTimes(2);
+  })
+});