Resolves gh-1512 (#1513)

dtype is passed to np.asarray when dpt.asarray is called with a Python scalar as input

This guarantees the expected OverflowError is thrown

dpctl/tensor/_ctors.py

@@ -632,17 +632,13 @@ def asarray(
                 usm_type=usm_type,
                 order=order,
             )
-
-        raise NotImplementedError(
-            "Converting Python sequences is not implemented"
-        )
     if copy is False:
         raise ValueError(
             f"Converting {type(obj)} to usm_ndarray requires a copy"
         )
     # obj is a scalar, create 0d array
     return _asarray_from_numpy_ndarray(
-        np.asarray(obj),
+        np.asarray(obj, dtype=dtype),
         dtype=dtype,
         usm_type=usm_type,
         sycl_queue=sycl_queue,

dpctl/tests/test_tensor_asarray.py

@@ -164,6 +164,21 @@ def test_asarray_input_validation():
     with pytest.raises(ValueError):
         # sequence is not rectangular
         dpt.asarray([[1], 2])
+    with pytest.raises(OverflowError):
+        # Python int too large for type
+        dpt.asarray(-9223372036854775809, dtype="i4")
+    with pytest.raises(ValueError):
+        # buffer to usm_ndarray requires a copy
+        dpt.asarray(memoryview(np.arange(5)), copy=False)
+    with pytest.raises(ValueError):
+        # Numpy array to usm_ndarray requires a copy
+        dpt.asarray(np.arange(5), copy=False)
+    with pytest.raises(ValueError):
+        # Python sequence to usm_ndarray requires a copy
+        dpt.asarray([1, 2, 3], copy=False)
+    with pytest.raises(ValueError):
+        # Python scalar to usm_ndarray requires a copy
+        dpt.asarray(5, copy=False)
 
 
 def test_asarray_input_validation2():