test(auth): add registration policy route-flow integration tests

apps/admin/src/app/login/page.test.tsx

@@ -0,0 +1,67 @@
+import type { ReactElement } from "react"
+import { beforeEach, describe, expect, it, vi } from "vitest"
+
+const { redirectMock, resolveRoleFromServerContextMock, hasOwnerUserMock } = vi.hoisted(() => ({
+  redirectMock: vi.fn((path: string) => {
+    throw new Error(`REDIRECT:${path}`)
+  }),
+  resolveRoleFromServerContextMock: vi.fn(),
+  hasOwnerUserMock: vi.fn(),
+}))
+
+vi.mock("next/navigation", () => ({
+  redirect: redirectMock,
+}))
+
+vi.mock("@/lib/access-server", () => ({
+  resolveRoleFromServerContext: resolveRoleFromServerContextMock,
+}))
+
+vi.mock("@/lib/auth/server", () => ({
+  hasOwnerUser: hasOwnerUserMock,
+}))
+
+vi.mock("./login-form", () => ({
+  LoginForm: ({ mode }: { mode: string }) => ({ type: "login-form", props: { mode } }),
+}))
+
+import LoginPage from "./page"
+
+function expectRedirect(call: () => Promise<unknown>, path: string) {
+  return expect(call()).rejects.toThrow(`REDIRECT:${path}`)
+}
+
+describe("login page", () => {
+  beforeEach(() => {
+    redirectMock.mockClear()
+    resolveRoleFromServerContextMock.mockReset()
+    hasOwnerUserMock.mockReset()
+  })
+
+  it("redirects authenticated users to dashboard", async () => {
+    resolveRoleFromServerContextMock.mockResolvedValue("manager")
+
+    await expectRedirect(() => LoginPage({ searchParams: Promise.resolve({}) }), "/")
+  })
+
+  it("redirects to welcome if owner is missing", async () => {
+    resolveRoleFromServerContextMock.mockResolvedValue(null)
+    hasOwnerUserMock.mockResolvedValue(false)
+
+    await expectRedirect(
+      () => LoginPage({ searchParams: Promise.resolve({ next: "/settings" }) }),
+      "/welcome?next=%2Fsettings",
+    )
+  })
+
+  it("renders sign-in mode once owner exists", async () => {
+    resolveRoleFromServerContextMock.mockResolvedValue(null)
+    hasOwnerUserMock.mockResolvedValue(true)
+
+    const page = (await LoginPage({ searchParams: Promise.resolve({}) })) as ReactElement<{
+      mode: string
+    }>
+
+    expect(page.props.mode).toBe("signin")
+  })
+})