Add basic test for Modal (#53140)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53140

As per title, this change adds the boilerplate code for a Fantom test on Modal

## Changelog:
[Internal] -

Reviewed By: andrewdacenko

Differential Revision: D79805808

fbshipit-source-id: c8c77e576a09b346cf29b290d68c75e540d5f146

packages/react-native/Libraries/Modal/__tests__/Modal-itest.js

@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
+import type {HostInstance} from 'react-native';
+
+import * as Fantom from '@react-native/fantom';
+import * as React from 'react';
+import {createRef} from 'react';
+import {Modal} from 'react-native';
+import ensureInstance from 'react-native/src/private/__tests__/utilities/ensureInstance';
+import ReactNativeElement from 'react-native/src/private/webapis/dom/nodes/ReactNativeElement';
+
+describe('<Modal>', () => {
+  describe('ref', () => {
+    describe('exampleMethod()', () => {
+      // more describe('<context>') or tests with it('<behaviour>')
+    });
+    // ... more methods
+    describe('instance', () => {
+      it('uses the "RN:ModalHostView" tag name', () => {
+        const elementRef = createRef<HostInstance>();
+        const root = Fantom.createRoot();
+        Fantom.runTask(() => {
+          root.render(<Modal ref={elementRef} />);
+        });
+
+        expect(elementRef.current).toBeInstanceOf(ReactNativeElement);
+        const element = ensureInstance(elementRef.current, ReactNativeElement);
+        expect(element.tagName).toBe('RN:ModalHostView');
+      });
+    });
+  });
+});