diff --git a/src/ragged/_spec_array_object.py b/src/ragged/_spec_array_object.py
index 8c76c89..c3d098b 100644
--- a/src/ragged/_spec_array_object.py
+++ b/src/ragged/_spec_array_object.py
@@ -47,7 +47,6 @@ def _shape_dtype(layout: Content) -> tuple[Shape, Dtype]:
         node = node.content
     if isinstance(node, EmptyArray):
         node = node.to_NumpyArray(dtype=np.float64)
-
     if isinstance(node, NumpyArray):
         shape = shape + node.data.shape[1:]
         return shape, node.data.dtype
diff --git a/tests-cuda/test_cuda_spec_set_functions.py b/tests-cuda/test_cuda_spec_set_functions.py
new file mode 100644
index 0000000..65b6643
--- /dev/null
+++ b/tests-cuda/test_cuda_spec_set_functions.py
@@ -0,0 +1,171 @@
+# BSD 3-Clause License; see https://github.com/scikit-hep/ragged/blob/main/LICENSE
+
+"""
+https://data-apis.org/array-api/latest/API_specification/set_functions.html
+"""
+
+from __future__ import annotations
+
+import awkward as ak
+import cupy as cp
+
+import ragged
+
+
+def test_existence():
+    assert ragged.unique_all is not None
+    assert ragged.unique_counts is not None
+    assert ragged.unique_inverse is not None
+    assert ragged.unique_values is not None
+
+
+# unique_values tests
+def test_can_take_list():
+    arr = ragged.array(cp.array([1, 2, 4, 3, 4, 5, 6, 20]))
+    expected_unique_values = ragged.array([1, 2, 3, 4, 5, 6, 20])
+    unique_values = ragged.unique_values(arr)
+    assert ak.to_list(expected_unique_values) == ak.to_list(unique_values)
+
+
+def test_can_take_empty_arr():
+    arr = ragged.array(cp.array([]))
+    expected_unique_values = ragged.array([])
+    unique_values = ragged.unique_values(arr)
+    assert ak.to_list(expected_unique_values) == ak.to_list(unique_values)
+
+
+def test_can_take_moredimensions():
+    arr = ragged.array(ak.Array([[1, 2, 2, 3, 4], [5, 6]], backend="cuda"))
+    expected_unique_values = ragged.array([1, 2, 3, 4, 5, 6])
+    unique_values = ragged.unique_values(arr)
+    assert ak.to_list(expected_unique_values) == ak.to_list(unique_values)
+
+
+def test_can_take_1d_array():
+    arr = ragged.array(cp.array([5, 6, 7, 8, 8, 9, 1, 2, 3, 4, 10, 0, 15, 2]))
+    expected_unique_values = ragged.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15])
+    assert ak.to_list(ragged.unique_values(arr)) == ak.to_list(expected_unique_values)
+
+
+# unique_counts tests
+def test_can_count_list():
+    arr = ragged.array(cp.array([1, 2, 4, 3, 4, 5, 6, 20]))
+    expected_unique_values = ragged.array([1, 2, 3, 4, 5, 6, 20])
+    expected_unique_counts = ragged.array([1, 1, 1, 2, 1, 1, 1])
+    unique_values, unique_counts = ragged.unique_counts(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_unique_counts)
+
+
+def test_can_count_empty_arr():
+    arr = ragged.array(cp.array([]))
+    expected_unique_values = ragged.array([])
+    expected_counts = ragged.array([])
+    unique_values, unique_counts = ragged.unique_counts(arr)
+    assert ak.to_list(expected_unique_values) == ak.to_list(unique_values)
+    assert ak.to_list(expected_counts) == ak.to_list(unique_counts)
+
+
+def test_can_count_simple_array():
+    arr = ragged.array(cp.array([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]))
+    expected_unique_values = ragged.array([1, 2, 3, 4])
+    expected_counts = ragged.array([1, 2, 3, 4])
+    unique_values, unique_counts = ragged.unique_counts(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_counts)
+
+
+def test_can_count_normal_array():
+    arr = ragged.array(
+        ak.Array([[1, 2, 2], [3], [3, 3], [4, 4, 4], [4]], backend="cuda")
+    )
+    expected_unique_values = ragged.array([1, 2, 3, 4])
+    expected_counts = ragged.array([1, 2, 3, 4])
+    unique_values, unique_counts = ragged.unique_counts(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_counts)
+
+
+# unique_inverse tests
+def test_can_inverse_list():
+    arr = ragged.array(cp.array([1, 2, 4, 3, 4, 5, 6, 20]))
+    expected_unique_values = ragged.array([1, 2, 3, 4, 5, 6, 20])
+    expected_inverse_indices = ragged.array([0, 1, 3, 2, 3, 4, 5, 6])
+    unique_values, inverse_indices = ragged.unique_inverse(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(inverse_indices) == ak.to_list(expected_inverse_indices)
+
+
+def test_can_inverse_empty_arr():
+    arr = ragged.array(cp.array([]))
+    expected_unique_values = ragged.array([])
+    expected_inverse_indices = ragged.array([])
+    unique_values, inverse_indices = ragged.unique_inverse(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(inverse_indices) == ak.to_list(expected_inverse_indices)
+
+
+def test_can_inverse_simple_array():
+    arr = ragged.array(ak.Array([[1, 2, 2], [3, 3, 3], [4, 4, 4, 4]], backend="cuda"))
+    expected_unique_values = ragged.array([1, 2, 3, 4])
+    expected_inverse_indices = ragged.array([0, 1, 1, 2, 2, 2, 3, 3, 3, 3])
+    unique_values, inverse_indices = ragged.unique_inverse(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(inverse_indices) == ak.to_list(expected_inverse_indices)
+
+
+def test_can_inverse_normal_array():
+    arr = ragged.array(
+        ak.Array([[1, 2, 2], [3], [3, 3], [4, 4, 4], [4]], backend="cuda")
+    )
+    expected_unique_values = ragged.array([1, 2, 3, 4])
+    expected_inverse_indices = ragged.array([0, 1, 1, 2, 2, 2, 3, 3, 3, 3])
+    unique_values, inverse_indices = ragged.unique_inverse(arr)
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(inverse_indices) == ak.to_list(expected_inverse_indices)
+
+
+# unique_all tests
+def test_can_all_list():
+    arr = ragged.array(cp.array([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]))
+    expected_unique_values = ragged.array([1, 2, 3, 4])
+    expected_unique_indices = ragged.array([0, 1, 3, 6])
+    expected_unique_inverse = ragged.array([0, 1, 1, 2, 2, 2, 3, 3, 3, 3])
+    expected_unique_counts = ragged.array([1, 2, 3, 4])
+    unique_values, unique_indices, unique_inverse, unique_counts = ragged.unique_all(
+        arr
+    )
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_indices) == ak.to_list(expected_unique_indices)
+    assert ak.to_list(unique_inverse) == ak.to_list(expected_unique_inverse)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_unique_counts)
+
+
+def test_can_all_empty_arr():
+    arr = ragged.array(cp.array([]))
+    expected_unique_values = ragged.array([])
+    expected_unique_indices = ragged.array([])
+    expected_unique_inverse = ragged.array([])
+    expected_unique_counts = ragged.array([])
+    unique_values, unique_indices, unique_inverse, unique_counts = ragged.unique_all(
+        arr
+    )
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_indices) == ak.to_list(expected_unique_indices)
+    assert ak.to_list(unique_inverse) == ak.to_list(expected_unique_inverse)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_unique_counts)
+
+
+def test_can_all_normal_array():
+    arr = ragged.array(ak.Array([[2, 2, 2], [3], [3, 5], [4, 4, 4], [4]]))
+    expected_unique_values = ragged.array([2, 3, 4, 5])
+    expected_unique_indices = ragged.array([0, 3, 6, 5])
+    expected_unique_inverse = ragged.array([0, 0, 0, 1, 1, 3, 2, 2, 2, 2])
+    expected_unique_counts = ragged.array([3, 2, 4, 1])
+    unique_values, unique_indices, unique_inverse, unique_counts = ragged.unique_all(
+        arr
+    )
+    assert ak.to_list(unique_values) == ak.to_list(expected_unique_values)
+    assert ak.to_list(unique_indices) == ak.to_list(expected_unique_indices)
+    assert ak.to_list(unique_inverse) == ak.to_list(expected_unique_inverse)
+    assert ak.to_list(unique_counts) == ak.to_list(expected_unique_counts)