Raise edit API errors with response details

test_mediawiki_api.py

@@ -0,0 +1,46 @@
+import unittest
+from unittest.mock import patch
+
+from add_links import mediawiki_api
+
+
+class EditPageTests(unittest.TestCase):
+    def test_edit_page_raises_api_error_with_mediawiki_message(self) -> None:
+        with patch(
+            "add_links.mediawiki_api.call",
+            return_value={"error": {"code": "badtoken", "info": "Invalid CSRF token."}},
+        ):
+            with self.assertRaises(mediawiki_api.APIError) as ctx:
+                mediawiki_api.edit_page(
+                    pageid=1,
+                    section=0,
+                    text="text",
+                    summary="summary",
+                    baserevid="123",
+                    token="bad",
+                )
+
+        self.assertEqual(str(ctx.exception), "Invalid CSRF token.")
+
+    def test_edit_page_raises_api_error_for_unexpected_response(self) -> None:
+        response = {"servedby": "mw-api-ext.eqiad.main"}
+
+        with patch("add_links.mediawiki_api.call", return_value=response):
+            with self.assertRaises(mediawiki_api.APIError) as ctx:
+                mediawiki_api.edit_page(
+                    pageid=1,
+                    section=0,
+                    text="text",
+                    summary="summary",
+                    baserevid="123",
+                    token="token",
+                )
+
+        self.assertEqual(
+            str(ctx.exception),
+            "Unexpected MediaWiki API response: {'servedby': 'mw-api-ext.eqiad.main'}",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()