diff --git a/Tests/helper.py b/Tests/helper.py
index 9849bf655..a7691f645 100644
--- a/Tests/helper.py
+++ b/Tests/helper.py
@@ -261,7 +261,11 @@ def hopper(mode: str | None = None, cache: dict[str, Image.Image] = {}) -> Image
     # (for fast, isolated, repeatable tests).
     im = cache.get(mode)
     if im is None:
-        if mode == "F":
+        if mode == "RGBa":
+            im = hopper("RGBA").convert(mode)
+        elif mode == "La":
+            im = hopper("LA").convert(mode)
+        elif mode == "F":
             im = hopper("L").convert(mode)
         elif mode[:4] == "I;16":
             im = hopper("I").convert(mode)