Fixed #27906 -- Fixed test tools counting of HTML matches for subsets of elements.

Previously examples such as '<a/><b/>' would not match in '<a/><b/><c/>'.

1 files changed, 18 insertions, 0 deletions

diff --git a/django/test/html.py b/django/test/html.py
index 36b44b0466..3b04217822 100644
--- a/django/test/html.py
+++ b/django/test/html.py
@@ -86,6 +86,7 @@ class Element:
             if self.children == element.children:
                 return 1
         i = 0
+        elem_child_idx = 0
         for child in self.children:
             # child is text content and element is also text content, then
             # make a simple "text" in "text"
@@ -96,9 +97,26 @@ class Element:
                     elif element in child:
                         return 1
             else:
+                # Look for element wholly within this child.
                 i += child._count(element, count=count)
                 if not count and i:
                     return i
+                # Also look for a sequence of element's children among self's
+                # children. self.children == element.children is tested above,
+                # but will fail if self has additional children. Ex: '<a/><b/>'
+                # is contained in '<a/><b/><c/>'.
+                if isinstance(element, RootElement) and element.children:
+                    elem_child = element.children[elem_child_idx]
+                    # Start or continue match, advance index.
+                    if elem_child == child:
+                        elem_child_idx += 1
+                        # Match found, reset index.
+                        if elem_child_idx == len(element.children):
+                            i += 1
+                            elem_child_idx = 0
+                    # No match, reset index.
+                    else:
+                        elem_child_idx = 0
         return i
 
     def __contains__(self, element):