feat: implement login and signup functionality with auto-create option in stackAuthApi

test/unit/service/stackAuthApi.test.ts

@@ -0,0 +1,44 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+import { loginByStackWithAutoCreate, loginByStackToken } from '../../../src/service/stackAuthApi'
+
+vi.mock('@/api/http', () => ({
+  proxyFetchPost: vi.fn(),
+}))
+
+describe('stackAuthApi', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('falls back to signup when login returns user not found', async () => {
+    const { proxyFetchPost } = await import('@/api/http')
+
+    vi.mocked(proxyFetchPost)
+      .mockResolvedValueOnce({ code: 1, text: 'User not found' })
+      .mockResolvedValueOnce({ code: 0, token: 't', email: 'e@example.com' })
+
+    const res = await loginByStackWithAutoCreate('stack-token')
+
+    expect(res.code).toBe(0)
+    expect(vi.mocked(proxyFetchPost)).toHaveBeenCalledTimes(2)
+
+    const firstUrl = vi.mocked(proxyFetchPost).mock.calls[0][0] as string
+    const secondUrl = vi.mocked(proxyFetchPost).mock.calls[1][0] as string
+
+    expect(firstUrl).toContain('/api/login-by_stack?')
+    expect(firstUrl).toContain('type=login')
+    expect(secondUrl).toContain('type=signup')
+  })
+
+  it('includes invite_code in query when provided', async () => {
+    const { proxyFetchPost } = await import('@/api/http')
+
+    vi.mocked(proxyFetchPost).mockResolvedValueOnce({ code: 0 })
+
+    await loginByStackToken({ token: 'stack-token', type: 'signup', inviteCode: 'INV123' })
+
+    const url = vi.mocked(proxyFetchPost).mock.calls[0][0] as string
+    expect(url).toContain('invite_code=INV123')
+  })
+})