fix: test catch if function is empty (#54597)

curriculum/challenges/english/07-scientific-computing-with-python/learn-regular-expressions-by-building-a-password-generator/656479aa5f298441c190bf8f.md

@@ -14,10 +14,36 @@ dashedName: step-13
 You should declare a function named `generate_password`.
 
 ```js
-({ test: () => assert(__pyodide.runPython(`
-    import inspect
-    generate_psw = __locals.get("generate_password")
-    inspect.isfunction(generate_psw)
+({
+  test: () => assert(runPython(`
+  _Node(_code).has_function('generate_password')
+  `))
+})
+```
+
+The import statements should still be outside the function.
+
+```js
+({
+  test: () => assert(runPython(`
+  imports_list = _Node(_code).find_imports()
+  any([imp.is_equivalent('import secrets') for imp in imports_list]) and any([imp.is_equivalent('import string') for imp in imports_list])
+  `))
+})
+```
+
+The four variable declarations should be moved inside the function.
+
+```js
+({
+  test: () => assert(runPython(`
+  func = _Node(_code).find_function('generate_password')
+  vars = ['letters', 'digits', 'symbols', 'all_characters']
+  func.find_variable('letters').is_equivalent('letters = string.ascii_letters') and \\
+  func.find_variable('digits').is_equivalent('digits = string.digits') and \\
+  func.find_variable('symbols').is_equivalent('symbols = string.punctuation') and \\
+  func.find_variable('all_characters').is_equivalent('all_characters = letters + digits + symbols') and \\
+  all(not _Node(_code).has_variable(var) for var in vars)
   `))
 })
 ```