diff --git a/yasnippet-tests.el b/yasnippet-tests.el
index e5c72df..cb5bd47 100644
--- a/yasnippet-tests.el
+++ b/yasnippet-tests.el
@@ -851,7 +851,7 @@ add the snippets associated with the given mode."
 (defun yas-should-expand (keys-and-expansions)
   (dolist (key-and-expansion keys-and-expansions)
     (yas-exit-all-snippets)
-    (narrow-to-region (point) (point))
+    (erase-buffer)
     (insert (car key-and-expansion))
     (let ((yas-fallback-behavior nil))
       (ert-simulate-command '(yas-expand)))
@@ -865,7 +865,7 @@ add the snippets associated with the given mode."
 (defun yas-should-not-expand (keys)
   (dolist (key keys)
     (yas-exit-all-snippets)
-    (narrow-to-region (point) (point))
+    (erase-buffer)
     (insert key)
     (let ((yas-fallback-behavior nil))
       (ert-simulate-command '(yas-expand)))