diff --git a/package.json b/package.json
index d6bea0a..c8773e7 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,10 @@
     "dev:mock": "VITE_USE_MOCK=true vite",
     "build": "vue-tsc && vite build",
     "preview": "vite preview",
-    "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore"
+    "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "vue": "^3.4.21",
@@ -25,7 +28,10 @@
     "vite": "^5.1.4",
     "vue-tsc": "^2.0.6",
     "msw": "^2.2.1",
-    "@types/node": "^20.11.19"
+    "@types/node": "^20.11.19",
+    "vitest": "^1.3.1",
+    "@vitest/coverage-v8": "^1.3.1",
+    "happy-dom": "^13.6.2"
   },
   "msw": {
     "workerDirectory": [
diff --git a/src/api/__tests__/api.test.ts b/src/api/__tests__/api.test.ts
new file mode 100644
index 0000000..b61297e
--- /dev/null
+++ b/src/api/__tests__/api.test.ts
@@ -0,0 +1,183 @@
+/**
+ * 前端 API 客户端单元测试
+ * 测试所有 API 模块的方法定义和类型
+ */
+
+import { describe, it, expect, vi } from 'vitest'
+
+// Mock axios
+vi.mock('axios', () => ({
+  default: {
+    create: vi.fn(() => ({
+      interceptors: {
+        request: { use: vi.fn() },
+        response: { use: vi.fn() }
+      },
+      get: vi.fn(),
+      post: vi.fn(),
+      put: vi.fn(),
+      delete: vi.fn()
+    }))
+  }
+}))
+
+// ==================== Account API 测试 ====================
+describe('AccountAPI', () => {
+  it('should export AccountAPI class', async () => {
+    const { AccountAPI } = await import('../account')
+    expect(AccountAPI).toBeDefined()
+  })
+
+  it('should have physical account methods', async () => {
+    const { AccountAPI } = await import('../account')
+    
+    // 实体账户相关方法
+    expect(typeof AccountAPI.createPhysicalAccount).toBe('function')
+    expect(typeof AccountAPI.getPhysicalAccounts).toBe('function')
+    expect(typeof AccountAPI.getPhysicalAccount).toBe('function')
+    expect(typeof AccountAPI.freezePhysicalAccount).toBe('function')
+    expect(typeof AccountAPI.unfreezePhysicalAccount).toBe('function')
+  })
+
+  it('should have sub account methods', async () => {
+    const { AccountAPI } = await import('../account')
+    
+    // 虚拟子账户相关方法
+    expect(typeof AccountAPI.createSubAccount).toBe('function')
+    expect(typeof AccountAPI.getSubAccount).toBe('function')
+    expect(typeof AccountAPI.getSubAccountBalance).toBe('function')
+    expect(typeof AccountAPI.freezeSubAccount).toBe('function')
+    expect(typeof AccountAPI.unfreezeSubAccount).toBe('function')
+    expect(typeof AccountAPI.closeSubAccount).toBe('function')
+  })
+})
+
+// ==================== Transaction API 测试 ====================
+describe('TransactionAPI', () => {
+  it('should export TransactionAPI class', async () => {
+    const { TransactionAPI } = await import('../transaction')
+    expect(TransactionAPI).toBeDefined()
+  })
+
+  it('should have all required methods', async () => {
+    const { TransactionAPI } = await import('../transaction')
+    
+    // 5 个核心交易 API 方法
+    expect(typeof TransactionAPI.transfer).toBe('function')
+    expect(typeof TransactionAPI.deposit).toBe('function')
+    expect(typeof TransactionAPI.withdraw).toBe('function')
+    expect(typeof TransactionAPI.getTransaction).toBe('function')
+    expect(typeof TransactionAPI.getTransactions).toBe('function')
+  })
+
+  it('should have DepositRequest and WithdrawRequest types', async () => {
+    // 类型检查 - 如果编译通过则测试通过
+    const { TransactionAPI } = await import('../transaction')
+    expect(TransactionAPI.deposit).toBeDefined()
+    expect(TransactionAPI.withdraw).toBeDefined()
+  })
+})
+
+// ==================== Ledger API 测试 ====================
+describe('LedgerAPI', () => {
+  it('should export LedgerAPI class', async () => {
+    const { LedgerAPI } = await import('../ledger')
+    expect(LedgerAPI).toBeDefined()
+  })
+
+  it('should have all required methods', async () => {
+    const { LedgerAPI } = await import('../ledger')
+    
+    // 3 个账务 API 方法
+    expect(typeof LedgerAPI.getSubjects).toBe('function')
+    expect(typeof LedgerAPI.getEntry).toBe('function')
+    expect(typeof LedgerAPI.getAccountEntries).toBe('function')
+  })
+})
+
+// ==================== Reconciliation API 测试 ====================
+describe('ReconciliationAPI', () => {
+  it('should export ReconciliationAPI class', async () => {
+    const { ReconciliationAPI } = await import('../reconciliation')
+    expect(ReconciliationAPI).toBeDefined()
+  })
+
+  it('should have all required methods', async () => {
+    const { ReconciliationAPI } = await import('../reconciliation')
+    
+    // 8 个对账 API 方法
+    expect(typeof ReconciliationAPI.runReconciliation).toBe('function')
+    expect(typeof ReconciliationAPI.getBatch).toBe('function')
+    expect(typeof ReconciliationAPI.getBatchItems).toBe('function')
+    expect(typeof ReconciliationAPI.verifyThreeAccounts).toBe('function')
+    expect(typeof ReconciliationAPI.createAdjustment).toBe('function')
+    expect(typeof ReconciliationAPI.approveAdjustment).toBe('function')
+    expect(typeof ReconciliationAPI.rejectAdjustment).toBe('function')
+    expect(typeof ReconciliationAPI.getPendingAdjustments).toBe('function')
+  })
+
+  it('should export status label mappings', async () => {
+    const { 
+      ReconciliationStatusLabels, 
+      ReconciliationItemStatusLabels,
+      AdjustmentTypeLabels,
+      AdjustmentStatusLabels 
+    } = await import('../reconciliation')
+    
+    expect(ReconciliationStatusLabels).toBeDefined()
+    expect(ReconciliationItemStatusLabels).toBeDefined()
+    expect(AdjustmentTypeLabels).toBeDefined()
+    expect(AdjustmentStatusLabels).toBeDefined()
+  })
+})
+
+// ==================== Points API 测试 ====================
+describe('PointsAPI', () => {
+  it('should export PointsAPI class', async () => {
+    const { PointsAPI } = await import('../points')
+    expect(PointsAPI).toBeDefined()
+  })
+
+  it('should have all required methods', async () => {
+    const { PointsAPI } = await import('../points')
+    
+    // 5 个积分 API 方法
+    expect(typeof PointsAPI.getAccounts).toBe('function')
+    expect(typeof PointsAPI.earnPoints).toBe('function')
+    expect(typeof PointsAPI.spendPoints).toBe('function')
+    expect(typeof PointsAPI.transferPoints).toBe('function')
+    expect(typeof PointsAPI.getTransactions).toBe('function')
+  })
+})
+
+// ==================== Types 测试 ====================
+describe('Type Definitions', () => {
+  it('should export points types', async () => {
+    const types = await import('@/types/points')
+    expect(types.PointsTypeLabels).toBeDefined()
+    expect(types.PointsTransactionTypeLabels).toBeDefined()
+  })
+
+  it('should export ledger types', async () => {
+    const types = await import('@/types/ledger')
+    expect(types.SubjectCategoryLabels).toBeDefined()
+    expect(types.DirectionLabels).toBeDefined()
+    expect(types.EntryStatusLabels).toBeDefined()
+    expect(types.PredefinedSubjects).toBeDefined()
+  })
+})
+
+// ==================== API Index 导出测试 ====================
+describe('API Index Exports', () => {
+  it('should export all API modules from index', async () => {
+    const api = await import('../index')
+    
+    expect(api.AccountAPI).toBeDefined()
+    expect(api.TransactionAPI).toBeDefined()
+    expect(api.ReconciliationAPI).toBeDefined()
+    expect(api.PointsAPI).toBeDefined()
+    expect(api.LedgerAPI).toBeDefined()
+    expect(api.apiClient).toBeDefined()
+  })
+})
+
diff --git a/src/api/ledger.ts b/src/api/ledger.ts
index 2a11463..40017fd 100644
--- a/src/api/ledger.ts
+++ b/src/api/ledger.ts
@@ -2,7 +2,7 @@
  * 账务 API 客户端
  * 提供会计科目、分录查询等功能
  */
-import apiClient from './client'
+import { apiClient } from './client'
 import type {
   AccountingSubject,
   LedgerEntry,
diff --git a/src/api/points.ts b/src/api/points.ts
index 9065fb2..e70c8a5 100644
--- a/src/api/points.ts
+++ b/src/api/points.ts
@@ -2,7 +2,7 @@
  * 积分 API 客户端
  * 提供积分账户管理、积分获取/消费/转移等功能
  */
-import apiClient from './client'
+import { apiClient } from './client'
 import type {
   PointsAccount,
   PointsTransaction,
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..c9ffa71
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,24 @@
+import { defineConfig } from 'vitest/config'
+import vue from '@vitejs/plugin-vue'
+import { fileURLToPath, URL } from 'node:url'
+
+export default defineConfig({
+  plugins: [vue()],
+  test: {
+    globals: true,
+    environment: 'happy-dom',
+    include: ['src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+      include: ['src/**/*.ts'],
+      exclude: ['src/**/*.d.ts', 'src/**/*.test.ts', 'src/mocks/**'],
+    },
+  },
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    }
+  }
+})
+