diff --git a/package-lock.json b/package-lock.json
index 1d17705..ca384a6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,6 +41,7 @@
         "@vitejs/plugin-react": "^5.1.1",
         "@vitest/coverage-v8": "^4.0.18",
         "autoprefixer": "^10.4.27",
+        "dotenv": "^17.3.1",
         "electron": "^39.2.6",
         "electron-builder": "^26.0.12",
         "electron-vite": "^5.0.0",
@@ -5591,6 +5592,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/dotenv": {
+      "version": "17.3.1",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.3.1.tgz",
+      "integrity": "sha512-IO8C/dzEb6O3F9/twg6ZLXz164a2fhTnEWb95H23Dm4OuN+92NmEAlTrupP9VW6Jm3sO26tQlqyvyi4CsnY9GA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dotenv-expand": {
       "version": "11.0.7",
       "resolved": "https://registry.npmjs.org/dotenv-expand/-/dotenv-expand-11.0.7.tgz",
diff --git a/package.json b/package.json
index 08a0a7d..f8ffa3c 100644
--- a/package.json
+++ b/package.json
@@ -61,6 +61,7 @@
     "@vitejs/plugin-react": "^5.1.1",
     "@vitest/coverage-v8": "^4.0.18",
     "autoprefixer": "^10.4.27",
+    "dotenv": "^17.3.1",
     "electron": "^39.2.6",
     "electron-builder": "^26.0.12",
     "electron-vite": "^5.0.0",
@@ -74,9 +75,9 @@
     "react": "^19.2.1",
     "react-dom": "^19.2.1",
     "tailwindcss": "^4.2.1",
+    "tsx": "^4.19.3",
     "typescript": "^5.9.3",
     "vite": "^7.2.6",
-    "vitest": "^4.0.18",
-    "tsx": "^4.19.3"
+    "vitest": "^4.0.18"
   }
 }
diff --git a/src/main/services/erp/erp-auth.ts b/src/main/services/erp/erp-auth.ts
index 87586fa..14baa34 100644
--- a/src/main/services/erp/erp-auth.ts
+++ b/src/main/services/erp/erp-auth.ts
@@ -4,6 +4,11 @@ import { createLogger } from '../logger'
 
 const log = createLogger('ErpAuthService')
 
+// Timeout constants
+const PAGE_LOAD_TIMEOUT = 10000
+const LOGIN_RESULT_TIMEOUT = 15000
+const FORCE_LOGIN_TIMEOUT = 5000
+
 /**
  * ERP Authentication Service
  * Manages login session and browser lifecycle
@@ -51,10 +56,13 @@ export class ErpAuthService {
     await page.goto(loginUrl)
 
     // Wait for page to load
-    await page.waitForLoadState('domcontentloaded', { timeout: 10000 })
+    await page.waitForLoadState('domcontentloaded', { timeout: PAGE_LOAD_TIMEOUT })
 
     // Wait for iframe to be present
-    await page.waitForSelector('#forwardFrame', { state: 'attached', timeout: 15000 })
+    await page.waitForSelector('#forwardFrame', {
+      state: 'attached',
+      timeout: LOGIN_RESULT_TIMEOUT
+    })
 
     // Extract forwardFrame (Python: main_frame = page.locator("#forwardFrame").content_frame)
     // This is the main working frame for all subsequent operations
@@ -89,7 +97,7 @@ export class ErpAuthService {
       throw new Error(`Failed to click login button: ${e}`)
     }
 
-    await page.waitForLoadState('domcontentloaded', { timeout: 10000 }).catch(() => {
+    await page.waitForLoadState('domcontentloaded', { timeout: PAGE_LOAD_TIMEOUT }).catch(() => {
       log.warn('Page load state check timed out, continuing')
     })
 
@@ -118,13 +126,15 @@ export class ErpAuthService {
 
     try {
       await Promise.race([
-        successLocator.waitFor({ state: 'visible', timeout: 15000 }),
-        errorLocator.waitFor({ state: 'visible', timeout: 15000 }),
-        forceLoginButton.waitFor({ state: 'visible', timeout: 5000 }).then(async () => {
-          log.info('Force login dialog detected, clicking confirm')
-          await forceLoginButton.click()
-          await this.waitForLoginResult(mainFrame)
-        })
+        successLocator.waitFor({ state: 'visible', timeout: LOGIN_RESULT_TIMEOUT }),
+        errorLocator.waitFor({ state: 'visible', timeout: LOGIN_RESULT_TIMEOUT }),
+        forceLoginButton
+          .waitFor({ state: 'visible', timeout: FORCE_LOGIN_TIMEOUT })
+          .then(async () => {
+            log.info('Force login dialog detected, clicking confirm')
+            await forceLoginButton.click()
+            await this.waitForLoginResult(mainFrame)
+          })
       ])
 
       const hasError = await errorLocator.isVisible()
diff --git a/tests/setup.ts b/tests/setup.ts
index eb10fe2..d354767 100644
--- a/tests/setup.ts
+++ b/tests/setup.ts
@@ -1,7 +1,17 @@
-import { beforeAll, afterAll } from 'vitest'
+import { beforeAll, afterAll, vi } from 'vitest'
 import dotenv from 'dotenv'
 import path from 'path'
 
+// Mock electron app module for unit tests
+vi.mock('electron', () => ({
+  app: {
+    isPackaged: false,
+    isReady: vi.fn().mockReturnValue(false),
+    getPath: vi.fn().mockReturnValue(path.join(process.cwd(), 'logs')),
+    on: vi.fn()
+  }
+}))
+
 // Load environment variables from project root
 dotenv.config({ path: path.resolve(process.cwd(), '.env') })
 
diff --git a/tests/unit/erp-auth.unit.test.ts b/tests/unit/erp-auth.unit.test.ts
index b55012f..ae25459 100644
--- a/tests/unit/erp-auth.unit.test.ts
+++ b/tests/unit/erp-auth.unit.test.ts
@@ -56,4 +56,38 @@ describe('ERP Authentication Service (Unit)', () => {
       await expect(service.close()).resolves.toBeUndefined()
     })
   })
+
+  describe('Class Structure', () => {
+    let service: ErpAuthService
+
+    beforeEach(() => {
+      const config: ErpConfig = {
+        url: 'https://test.example.com',
+        username: 'testuser',
+        password: 'testpass'
+      }
+      service = new ErpAuthService(config)
+    })
+
+    it('should have login method that returns a Promise', () => {
+      expect(service.login).toBeDefined()
+      expect(typeof service.login).toBe('function')
+      expect(service.login()).toBeInstanceOf(Promise)
+    })
+
+    it('should have close method', () => {
+      expect(service.close).toBeDefined()
+      expect(typeof service.close).toBe('function')
+    })
+
+    it('should have getSession method', () => {
+      expect(service.getSession).toBeDefined()
+      expect(typeof service.getSession).toBe('function')
+    })
+
+    it('should have isActive method', () => {
+      expect(service.isActive).toBeDefined()
+      expect(typeof service.isActive).toBe('function')
+    })
+  })
 })