Refs #32556 -- Added django.test.html.normalize_attributes().

django/test/html.py

@@ -14,6 +14,24 @@ def normalize_whitespace(string):
     return ASCII_WHITESPACE.sub(' ', string)
 
 
+def normalize_attributes(attributes):
+    normalized = []
+    for name, value in attributes:
+        if name == 'class' and value:
+            # Special case handling of 'class' attribute, so that comparisons
+            # of DOM instances are not sensitive to ordering of classes.
+            value = ' '.join(sorted(
+                value for value in ASCII_WHITESPACE.split(value) if value
+            ))
+        # Attributes without a value is same as attribute with value that
+        # equals the attributes name:
+        # <input checked> == <input checked="checked">
+        if not value or value == name:
+            value = None
+        normalized.append((name, value))
+    return normalized
+
+
 class Element:
     def __init__(self, name, attributes):
         self.name = name
@@ -55,21 +73,8 @@ class Element:
     def __eq__(self, element):
         if not hasattr(element, 'name') or self.name != element.name:
             return False
-        if len(self.attributes) != len(element.attributes):
-            return False
         if self.attributes != element.attributes:
-            # attributes without a value is same as attribute with value that
+            return False
-            # equals the attributes name:
-            # <input checked> == <input checked="checked">
-            for i in range(len(self.attributes)):
-                attr, value = self.attributes[i]
-                other_attr, other_value = element.attributes[i]
-                if not value:
-                    value = attr
-                if not other_value:
-                    other_value = other_attr
-                if attr != other_attr or value != other_value:
-                    return False
         return self.children == element.children
 
     def __hash__(self):
@@ -194,14 +199,7 @@ class Parser(HTMLParser):
             self.handle_endtag(tag)
 
     def handle_starttag(self, tag, attrs):
-        # Special case handling of 'class' attribute, so that comparisons of DOM
+        attrs = normalize_attributes(attrs)
-        # instances are not sensitive to ordering of classes.
-        attrs = [
-            (name, ' '.join(sorted(value for value in ASCII_WHITESPACE.split(value) if value)))
-            if name == "class"
-            else (name, value)
-            for name, value in attrs
-        ]
         element = Element(tag, attrs)
         self.current.append(element)
         if tag not in self.SELF_CLOSING_TAGS: