improve covergae dpnp_iface_manipulation.py (#2326)

After merging #2230, coverage for `dpnp.iface_manipulation.py` was
decreased related to `dpnp.copyto` function. This PR adds new tests to
improve the coverage and updates the logic used in `dpnp.copyto` to pass
the new tests.

Author: vtavana

dpnp/dpnp_iface_manipulation.py

@@ -1518,11 +1518,10 @@ def copyto(dst, src, casting="same_kind", where=True):
             f"but got {type(dst)}"
         )
     if not dpnp.is_supported_array_type(src):
-        no_dtype_attr = not hasattr(src, "dtype")
+        python_sc = dpnp.isscalar(src) and not isinstance(src, numpy.generic)
         src = dpnp.array(src, sycl_queue=dst.sycl_queue)
-        if no_dtype_attr:
-            # This case (scalar, list, etc) needs special handling to
-            # behave similar to NumPy
+        if python_sc:
+            # Python scalar needs special handling to behave similar to NumPy
             if dpnp.issubdtype(src, dpnp.integer) and dpnp.issubdtype(
                 dst, dpnp.unsignedinteger
             ):

dpnp/tests/test_manipulation.py

@@ -25,20 +25,6 @@
 )
 from .third_party.cupy import testing
 
-testdata = []
-testdata += [
-    ([True, False, True], dtype)
-    for dtype in get_all_dtypes(no_none=True, no_complex=True)
-]
-testdata += [
-    ([1, -1, 0], dtype)
-    for dtype in get_all_dtypes(
-        no_none=True, no_bool=True, no_complex=True, no_unsigned=True
-    )
-]
-testdata += [([0.1, 0.0, -0.1], dtype) for dtype in get_float_dtypes()]
-testdata += [([1j, -1j, 1 - 2j], dtype) for dtype in get_complex_dtypes()]
-
 
 def _compare_results(result, expected):
     """Compare lists of arrays."""
@@ -49,40 +35,6 @@ def _compare_results(result, expected):
         assert_array_equal(x, y)
 
 
-@pytest.mark.parametrize("in_obj, out_dtype", testdata)
-def test_copyto_dtype(in_obj, out_dtype):
-    ndarr = numpy.array(in_obj)
-    expected = numpy.empty(ndarr.size, dtype=out_dtype)
-    numpy.copyto(expected, ndarr)
-
-    dparr = dpnp.array(in_obj)
-    result = dpnp.empty(dparr.size, dtype=out_dtype)
-    dpnp.copyto(result, dparr)
-
-    assert_array_equal(result, expected)
-
-
-@pytest.mark.parametrize("dst", [7, numpy.ones(10), (2, 7), [5], range(3)])
-def test_copyto_dst_raises(dst):
-    a = dpnp.array(4)
-    with pytest.raises(
-        TypeError,
-        match="Destination array must be any of supported type, but got",
-    ):
-        dpnp.copyto(dst, a)
-
-
-@pytest.mark.parametrize("where", [numpy.ones(10), (2, 7), [5], range(3)])
-def test_copyto_where_raises(where):
-    a = dpnp.empty((2, 3))
-    b = dpnp.arange(6).reshape((2, 3))
-
-    with pytest.raises(
-        TypeError, match="`where` array must be any of supported type, but got"
-    ):
-        dpnp.copyto(a, b, where=where)
-
-
 def test_result_type():
     X = [dpnp.ones((2), dtype=dpnp.int64), dpnp.int32, "float32"]
     X_np = [numpy.ones((2), dtype=numpy.int64), numpy.int32, "float32"]
@@ -365,6 +317,102 @@ def test_broadcast_shapes(self, shape):
         assert_equal(result, expected)
 
 
+class TestCopyTo:
+    testdata = []
+    testdata += [
+        ([True, False, True], dtype)
+        for dtype in get_all_dtypes(no_none=True, no_complex=True)
+    ]
+    testdata += [
+        ([1, -1, 0], dtype)
+        for dtype in get_all_dtypes(
+            no_none=True, no_bool=True, no_complex=True, no_unsigned=True
+        )
+    ]
+    testdata += [([0.1, 0.0, -0.1], dtype) for dtype in get_float_dtypes()]
+    testdata += [([1j, -1j, 1 - 2j], dtype) for dtype in get_complex_dtypes()]
+
+    @pytest.mark.parametrize("data, dt_out", testdata)
+    def test_dtype(self, data, dt_out):
+        a = numpy.array(data)
+        ia = dpnp.array(a)
+
+        expected = numpy.empty(a.size, dtype=dt_out)
+        result = dpnp.empty(ia.size, dtype=dt_out)
+        numpy.copyto(expected, a)
+        dpnp.copyto(result, ia)
+
+        assert_array_equal(result, expected)
+
+    @pytest.mark.parametrize("data, dt_out", testdata)
+    def test_dtype_input_list(self, data, dt_out):
+        expected = numpy.empty(3, dtype=dt_out)
+        result = dpnp.empty(3, dtype=dt_out)
+        assert isinstance(data, list)
+        numpy.copyto(expected, data)
+        dpnp.copyto(result, data)
+
+        assert_array_equal(result, expected)
+
+    @pytest.mark.parametrize("xp", [dpnp, numpy])
+    @pytest.mark.parametrize(
+        "data", [(1, 2, -3), [1, 2, -3]], ids=["tuple", "list"]
+    )
+    @pytest.mark.parametrize(
+        "dst_dt", [dpnp.uint8, dpnp.uint16, dpnp.uint32, dpnp.uint64]
+    )
+    def test_casting_error(self, xp, data, dst_dt):
+        # cannot cast to unsigned integer
+        dst = xp.empty(3, dtype=dst_dt)
+        assert_raises(TypeError, xp.copyto, dst, data)
+
+    @pytest.mark.parametrize(
+        "dt_out", [dpnp.uint8, dpnp.uint16, dpnp.uint32, dpnp.uint64]
+    )
+    def test_positive_python_scalar(self, dt_out):
+        # src is python scalar and positive
+        expected = numpy.empty(1, dtype=dt_out)
+        result = dpnp.array(expected)
+        numpy.copyto(expected, 5)
+        dpnp.copyto(result, 5)
+
+        assert_array_equal(result, expected)
+
+    @testing.with_requires("numpy>=2.1")
+    @pytest.mark.parametrize("xp", [dpnp, numpy])
+    @pytest.mark.parametrize(
+        "dst_dt", [dpnp.uint8, dpnp.uint16, dpnp.uint32, dpnp.uint64]
+    )
+    def test_numpy_scalar(self, xp, dst_dt):
+        dst = xp.empty(1, dtype=dst_dt)
+        # cannot cast from signed int to unsigned int, src is numpy scalar
+        assert_raises(TypeError, xp.copyto, dst, numpy.int32(5))
+        assert_raises(TypeError, xp.copyto, dst, numpy.int32(-5))
+
+        # Python integer -5 out of bounds, src is python scalar and negative
+        assert_raises(OverflowError, xp.copyto, dst, -5)
+
+    @pytest.mark.parametrize("dst", [7, numpy.ones(10), (2, 7), [5], range(3)])
+    def test_dst_raises(self, dst):
+        a = dpnp.array(4)
+        with pytest.raises(
+            TypeError,
+            match="Destination array must be any of supported type, but got",
+        ):
+            dpnp.copyto(dst, a)
+
+    @pytest.mark.parametrize("where", [numpy.ones(10), (2, 7), [5], range(3)])
+    def test_where_raises(self, where):
+        a = dpnp.empty((2, 3))
+        b = dpnp.arange(6).reshape((2, 3))
+
+        with pytest.raises(
+            TypeError,
+            match="`where` array must be any of supported type, but got",
+        ):
+            dpnp.copyto(a, b, where=where)
+
+
 class TestDelete:
     @pytest.mark.parametrize(
         "obj", [slice(0, 4, 2), 3, [2, 3]], ids=["slice", "int", "list"]