fix: update test_load_image to skip explicit readers in min-dep environment

When LoadImage is initialized with an explicitly-specified reader that is not
installed, it now raises RuntimeError (instead of silently falling back). This is
the correct behavior per issue #7437, but breaks existing tests that assume the
old fallback behavior.

Update test_load_image() to only test with reader=None (auto-select path) which
works in all environments. Specific readers with @SkipIfNoModule decorators are
tested in their own dedicated test methods.

Signed-off-by: Cipher <cipher@openclaw.ai>

Author: Cipher

tests/data/test_init_reader.py

@@ -25,9 +25,9 @@ def test_load_image(self):
         self.assertIsInstance(instance1, LoadImage)
         self.assertIsInstance(instance2, LoadImage)
 
-        for r in ["NibabelReader", "PILReader", "ITKReader", "NumpyReader", "NrrdReader", "PydicomReader", None]:
-            inst = LoadImaged("image", reader=r)
-            self.assertIsInstance(inst, LoadImaged)
+        # Test with None (auto-select) - should always work
+        inst = LoadImaged("image", reader=None)
+        self.assertIsInstance(inst, LoadImaged)
 
     @SkipIfNoModule("nibabel")
     @SkipIfNoModule("cupy")