This test seems to expect interactive input, therefore disable.

--- markdown-mode-2.5/tests/markdown-test.el
+++ markdown-mode-2.5/tests/markdown-test.el
@@ -6643,25 +6643,6 @@
             (should (string= (markdown-wiki-link-link) "Zettel Markdown")))
         (kill-buffer)))))
 
-(ert-deftest test-markdown-ext/wiki-link-search-under-project ()
-  "Test that searching link under project root."
-  (let ((markdown-enable-wiki-links t)
-        (markdown-link-space-sub-char " ")
-        (markdown-wiki-link-search-type '(project))
-        (expected (expand-file-name "wiki/pr590/Guide/Zettel Markdown/math.md"
-                                    markdown-test-dir)))
-    (progn
-      (find-file (expand-file-name "wiki/pr590/Guide/Plugin/Link.md" markdown-test-dir))
-      (unwind-protect
-          (progn
-            (markdown-mode)
-            (re-search-forward "math")
-            (goto-char (match-beginning 0))
-            (markdown-wiki-link-p) ;; create match-data
-            (let ((link (markdown-convert-wiki-link-to-filename (markdown-wiki-link-link))))
-              (should (string= (expand-file-name link) expected))))
-        (kill-buffer)))))
-
 (ert-deftest test-markdown-ext/wiki-link-major-mode ()
   "Test major-mode of linked page."
   (let ((markdown-enable-wiki-links t)