Wrap unique_values call in xp.asarray

Author: OmarManzoor

src/array_api_extra/_lib/_funcs.py

@@ -749,4 +749,4 @@ def union1d(a: Array, b: Array, /, *, xp: ModuleType) -> Array:
     """See docstring in `array_api_extra._delegation.py`."""
     a = xp.reshape(a, (-1,))
     b = xp.reshape(b, (-1,))
-    return xp.unique_values(xp.concat([a, b]))
+    return xp.asarray(xp.unique_values(xp.concat([a, b])))

tests/test_funcs.py

@@ -1640,7 +1640,6 @@ def test_kind(self, xp: ModuleType, library: Backend):
         xp_assert_equal(res, expected)
 
 
-@pytest.mark.skip_xp_backend(Backend.SPARSE, reason="unique_values returns arrays")
 @pytest.mark.skip_xp_backend(
     Backend.ARRAY_API_STRICTEST,
     reason="data_dependent_shapes flag for unique_values is disabled",