test: improve mountTest and rtlTest coverage (ant-design#57067)

* test: improve mountTest and rtlTest coverage

## Changes

### 1. Add missing mountTest and rtlTest for components:
- anchor (Anchor.test.tsx)
- collapse (index.test.tsx, includes Panel)
- splitter (index.test.tsx)
- masonry (index.test.tsx)
- affix (Affix.test.tsx, added mountTest)
- alert (index.test.tsx, added mountTest)

### 2. Remove duplicate tests:
- radio/Button: removed duplicate mountTest and rtlTest from radio-button.test.tsx
  (already covered in radio.test.tsx)

### 3. Remove misplaced mountTest and rtlTest from semantic.test.tsx:
These tests should be in index.test.tsx, not semantic.test.tsx.
Removed from:
- auto-complete
- color-picker
- divider
- image
- pagination
- popconfirm
- table
- tabs
- tree

Note: All components still have mountTest and rtlTest coverage in their
respective index.test.tsx or main test files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: remove obsolete snapshots from semantic test files

Remove obsolete RTL snapshots from pagination, color-picker, and popconfirm
semantic.test.tsx files after removing misplaced rtlTest.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: update snapshot

* revert test case

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: afc163

components/affix/__tests__/Affix.test.tsx

@@ -2,6 +2,7 @@ import React, { useEffect, useRef } from 'react';
 
 import Affix from '..';
 import { accessibilityTest } from '../../../tests/shared/accessibilityTest';
+import mountTest from '../../../tests/shared/mountTest';
 import rtlTest from '../../../tests/shared/rtlTest';
 import { render, triggerResize, waitFakeTimer } from '../../../tests/utils';
 import Button from '../../button';
@@ -38,6 +39,7 @@ const AffixMounter: React.FC<AffixProps> = (props) => {
 };
 
 describe('Affix Render', () => {
+  mountTest(() => <Affix>test</Affix>);
   rtlTest(() => <Affix>test</Affix>);
   accessibilityTest(() => <Affix>test</Affix>);
 

components/alert/__tests__/index.test.tsx

@@ -4,6 +4,7 @@ import userEvent from '@testing-library/user-event';
 
 import Alert from '..';
 import { accessibilityTest } from '../../../tests/shared/accessibilityTest';
+import mountTest from '../../../tests/shared/mountTest';
 import rtlTest from '../../../tests/shared/rtlTest';
 import { act, fireEvent, render, screen, waitFakeTimer } from '../../../tests/utils';
 import Button from '../../button';
@@ -17,6 +18,7 @@ const { resetWarned } = warning;
 const { ErrorBoundary } = Alert;
 
 describe('Alert', () => {
+  mountTest(Alert);
   rtlTest(Alert);
   accessibilityTest(Alert);
 

components/anchor/__tests__/Anchor.test.tsx

@@ -3,6 +3,8 @@ import { warning } from '@rc-component/util';
 import scrollIntoView from 'scroll-into-view-if-needed';
 
 import Anchor from '..';
+import mountTest from '../../../tests/shared/mountTest';
+import rtlTest from '../../../tests/shared/rtlTest';
 import { act, fireEvent, render, waitFakeTimer } from '../../../tests/utils';
 import Button from '../../button';
 import type { AnchorDirection } from '../Anchor';
@@ -22,6 +24,8 @@ const getHashUrl = () => `Anchor-API-${idCounter++}`;
 
 jest.mock('scroll-into-view-if-needed', () => jest.fn());
 describe('Anchor Render', () => {
+  mountTest(Anchor);
+  rtlTest(Anchor);
   const getBoundingClientRectMock = jest.spyOn(
     HTMLHeadingElement.prototype,
     'getBoundingClientRect',

components/anchor/__tests__/__snapshots__/Anchor.test.tsx.snap

@@ -167,3 +167,26 @@ exports[`Anchor Render renders items correctly#horizontal 1`] = `
   </div>
 </div>
 `;
+
+exports[`Anchor Render rtl render component should be rendered correctly in RTL direction 1`] = `
+<div
+  class=""
+>
+  <div
+    class=""
+  >
+    <div
+      class="css-var-root ant-anchor-css-var ant-anchor-wrapper ant-anchor-rtl"
+      style="max-height: 100vh;"
+    >
+      <div
+        class="ant-anchor"
+      >
+        <span
+          class="ant-anchor-ink"
+        />
+      </div>
+    </div>
+  </div>
+</div>
+`;

components/auto-complete/__tests__/__snapshots__/semantic.test.tsx.snap

@@ -1,14 +1,9 @@
 import React from 'react';
 
 import AutoComplete from '..';
-import mountTest from '../../../tests/shared/mountTest';
-import rtlTest from '../../../tests/shared/rtlTest';
 import { render } from '../../../tests/utils';
 
 describe('AutoComplete.Semantic', () => {
-  mountTest(AutoComplete);
-  rtlTest(AutoComplete);
-
   it('should support classNames and styles', () => {
     const classNames = {
       root: 'custom-root',

components/auto-complete/__tests__/semantic.test.tsx

@@ -144,6 +144,36 @@ exports[`Collapse could override default openMotion 1`] = `
 </div>
 `;
 
+exports[`Collapse rtl render component should be rendered correctly in RTL direction 1`] = `
+<div
+  class="ant-collapse ant-collapse-icon-placement-start ant-collapse-rtl css-var-root"
+/>
+`;
+
+exports[`Collapse rtl render component should be rendered correctly in RTL direction 2`] = `
+<div
+  class="ant-collapse-item"
+>
+  <div
+    aria-disabled="false"
+    class="ant-collapse-header"
+    role="button"
+    tabindex="0"
+  >
+    <div
+      class="ant-collapse-expand-icon"
+    >
+      <i
+        class="arrow"
+      />
+    </div>
+    <span
+      class="ant-collapse-title"
+    />
+  </div>
+</div>
+`;
+
 exports[`Collapse should render extra node of panel 1`] = `
 <div
   class="ant-collapse ant-collapse-icon-placement-start css-var-root"

components/collapse/__tests__/__snapshots__/index.test.tsx.snap

@@ -1,11 +1,19 @@
 import React from 'react';
 
 import { resetWarned } from '../../_util/warning';
+import mountTest from '../../../tests/shared/mountTest';
+import rtlTest from '../../../tests/shared/rtlTest';
 import { act, fireEvent, render, waitFakeTimer } from '../../../tests/utils';
 import ConfigProvider from '../../config-provider';
 
 describe('Collapse', () => {
   const Collapse = require('..').default;
+  const Panel = Collapse.Panel;
+
+  mountTest(Collapse);
+  mountTest(Panel);
+  rtlTest(Collapse);
+  rtlTest(Panel);
 
   const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
 

components/collapse/__tests__/index.test.tsx

@@ -2,13 +2,9 @@ import React from 'react';
 import { render } from '@testing-library/react';
 
 import { resetWarned } from '../../_util/warning';
-import mountTest from '../../../tests/shared/mountTest';
-import rtlTest from '../../../tests/shared/rtlTest';
 import ColorPicker from '../ColorPicker';
 
 describe('ColorPicker.Semantic', () => {
-  mountTest(ColorPicker);
-  rtlTest(ColorPicker);
   const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
   beforeEach(() => {
     resetWarned();