修复展厅列表嵌入返回入口

tests/unit/ExplainHallSelect.spec.ts

@@ -1,14 +1,46 @@
 // @vitest-environment happy-dom
 
 import { mount } from '@vue/test-utils'
-import { describe, expect, it, vi } from 'vitest'
+import { afterEach, describe, expect, it, vi } from 'vitest'
 import ExplainHallSelect from '@/components/explain/ExplainHallSelect.vue'
 
-vi.mock('@/utils/hostEnvironment', () => ({
-  isEmbeddedInWechatMiniProgram: () => false
+const hostEnvironmentMocks = vi.hoisted(() => ({
+  embeddedInWechatMiniProgram: false
 }))
 
+vi.mock('@/utils/hostEnvironment', () => ({
+  isEmbeddedInWechatMiniProgram: () => hostEnvironmentMocks.embeddedInWechatMiniProgram
+}))
+
+afterEach(() => {
+  hostEnvironmentMocks.embeddedInWechatMiniProgram = false
+})
+
 describe('讲解展厅选择列表', () => {
+  it('微信嵌入态独立页面可强制显示 H5 返回入口，且不使用宿主导航布局', async () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    const wrapper = mount(ExplainHallSelect, {
+      props: {
+        forceInternalHeader: true
+      }
+    })
+
+    expect(wrapper.findAll('.explain-page-header')).toHaveLength(1)
+    expect(wrapper.findAll('.header-back')).toHaveLength(1)
+    expect(wrapper.classes()).not.toContain('host-navigation')
+
+    await wrapper.get('.header-back').trigger('tap')
+    expect(wrapper.emitted('back')).toEqual([[]])
+  })
+
+  it('微信嵌入态未强制时保留宿主导航布局，保护首页讲解 Tab', () => {
+    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
+    const wrapper = mount(ExplainHallSelect)
+
+    expect(wrapper.find('.explain-page-header').exists()).toBe(false)
+    expect(wrapper.classes()).toContain('host-navigation')
+  })
+
   it('展厅卡片只显示讲解对象数量，不暴露业务单元契约', async () => {
     const wrapper = mount(ExplainHallSelect, {
       props: {