dnscms: upgrade to wagtail 8 and django 6.1, test upgrade-sensitive admin surfaces

dnscms/tests/test_rich_text.py

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+"""Tests for the custom "button" rich text link feature (dnscms/rich_text.py).
+
+- DB HTML -> front-end HTML (expand_db_html)
+- DB HTML -> ContentState (editor load)
+- ContentState -> DB HTML (editor save)
+"""
+
+import json
+
+from wagtail.admin.rich_text.converters.contentstate import ContentstateConverter
+from wagtail.rich_text import expand_db_html
+
+DB_HTML = '<a linktype="button" data-href="/billetter/">Kjøp billett</a>'
+
+
+def test_expand_db_html_rewrites_button_link():
+    assert expand_db_html(DB_HTML) == '<a class="button" href="/billetter/">Kjøp billett</a>'
+
+
+def test_expand_db_html_escapes_href():
+    html = expand_db_html('<a linktype="button" data-href="/x/?a=1&amp;b=2">B</a>')
+    assert html == '<a class="button" href="/x/?a=1&amp;b=2">B</a>'
+
+
+def test_expand_db_html_missing_href_falls_back_to_empty():
+    assert expand_db_html('<a linktype="button">B</a>') == '<a class="button" href="">B</a>'
+
+
+def test_db_html_to_contentstate():
+    """Editor load: the linktype anchor becomes a MUTABLE BUTTON entity."""
+    converter = ContentstateConverter(features=["button-link"])
+    contentstate = json.loads(converter.from_database_format(DB_HTML))
+
+    entities = list(contentstate["entityMap"].values())
+    assert len(entities) == 1
+    entity = entities[0]
+    assert entity["type"] == "BUTTON"
+    assert entity["mutability"] == "MUTABLE"
+    assert entity["data"] == {"url": "/billetter/"}
+
+    block = contentstate["blocks"][0]
+    assert block["text"] == "Kjøp billett"
+    assert len(block["entityRanges"]) == 1
+
+
+def test_contentstate_roundtrip_preserves_button_link():
+    """Editor load + save must not lose or mangle the stored linktype anchor."""
+    stored = f'<p data-block-key="abc12">{DB_HTML}</p>'
+    converter = ContentstateConverter(features=["button-link"])
+    roundtripped = converter.to_database_format(converter.from_database_format(stored))
+    assert roundtripped == stored