Added first controls

src/myfasthtml/test/matcher.py

@@ -90,6 +90,14 @@ class Empty(ChildrenPredicate):
     return len(actual.children) == 0 and len(actual.attrs) == 0
 
 
+class NoChildren(ChildrenPredicate):
+  def __init__(self):
+    super().__init__(None)
+  
+  def validate(self, actual):
+    return len(actual.children) == 0
+
+
 class AttributeForbidden(ChildrenPredicate):
   """
   To validate that an attribute is not present in an element.
@@ -402,3 +410,59 @@ def matches(actual, expected, path=""):
                                           _expected=expected)
   
   return True
+
+
+def find(ft, expected):
+  res = []
+  
+  def _type(x):
+    return type(x)
+  
+  def _same(_ft, _expected):
+    if _ft == _expected:
+      return True
+    
+    if _ft.tag != _expected.tag:
+      return False
+    
+    for attr in _expected.attrs:
+      if attr not in _ft.attrs or _ft.attrs[attr] != _expected.attrs[attr]:
+        return False
+    
+    for expected_child in _expected.children:
+      for ft_child in _ft.children:
+        if _same(ft_child, expected_child):
+          break
+      else:
+        return False
+    
+    return True
+  
+  def _find(current, current_expected):
+    
+    if _type(current) != _type(current_expected):
+      return []
+    
+    if not hasattr(current, "tag"):
+      return [current] if current == current_expected else []
+    
+    _found = []
+    if _same(current, current_expected):
+      _found.append(current)
+    
+    # look at the children
+    for child in current.children:
+      _found.extend(_find(child, current_expected))
+    
+    return _found
+  
+  ft_as_list = [ft] if not isinstance(ft, (list, tuple, set)) else ft
+  
+  for current_ft in ft_as_list:
+    found = _find(current_ft, expected)
+    res.extend(found)
+  
+  if len(res) == 0:
+    raise AssertionError(f"No element found for '{expected}'")
+  
+  return res