refactor: move TypeScript and TSX test code to fixture files

tests/fixtures/languages/tsx/test.tsx

@@ -1,11 +1,30 @@
-import React from 'react';
+import React, { useState, useEffect } from 'react';
 
-interface GreetingProps {
+interface UserProps {
     name: string;
+    age?: number;
 }
 
-const Greeting: React.FC<GreetingProps> = ({ name }) => {
-    return <h1>Hello, {name}!</h1>;
+// Component with props interface
+const UserGreeting: React.FC<UserProps> = ({ name, age }) => {
+    const [greeting, setGreeting] = useState<string>('');
+
+    useEffect(() => {
+        setGreeting(`Hello, ${name}${age ? ` (${age})` : ''}!`);
+    }, [name, age]);
+
+    return <h1>{greeting}</h1>;
 };
 
-export default Greeting;
+// Custom hook
+function useCounter(initial: number = 0) {
+    const [count, setCount] = useState(initial);
+    const increment = () => setCount(c => c + 1);
+    return { count, increment };
+}
+
+// Constants
+const DEFAULT_NAME = 'World';
+const MAX_AGE = 150;
+
+export { UserGreeting, useCounter, DEFAULT_NAME, MAX_AGE };