Add new nanargmin/nanargmax tests (#2223)

The PR proposes to extend third party tests with new nanargmin/nanargmax
tests added recently.

dpnp/tests/third_party/cupy/sorting_tests/test_search.py

@@ -532,6 +532,22 @@ def test_nanargmin_zero_size_axis1(self, xp, dtype):
         a = testing.shaped_random((0, 1), xp, dtype)
         return xp.nanargmin(a, axis=1)
 
+    @testing.for_all_dtypes(no_complex=True)
+    @testing.numpy_cupy_allclose()
+    def test_nanargmin_out_float_dtype(self, xp, dtype):
+        a = xp.array([[0.0]])
+        b = xp.empty((1), dtype="int64")
+        xp.nanargmin(a, axis=1, out=b)
+        return b
+
+    @testing.for_all_dtypes(no_complex=True)
+    @testing.numpy_cupy_array_equal()
+    def test_nanargmin_out_int_dtype(self, xp, dtype):
+        a = xp.array([1, 0])
+        b = xp.empty((), dtype="int64")
+        xp.nanargmin(a, out=b)
+        return b
+
 
 class TestNanArgMax:
 
@@ -623,6 +639,22 @@ def test_nanargmax_zero_size_axis1(self, xp, dtype):
         a = testing.shaped_random((0, 1), xp, dtype)
         return xp.nanargmax(a, axis=1)
 
+    @testing.for_all_dtypes(no_complex=True)
+    @testing.numpy_cupy_allclose()
+    def test_nanargmax_out_float_dtype(self, xp, dtype):
+        a = xp.array([[0.0]])
+        b = xp.empty((1), dtype="int64")
+        xp.nanargmax(a, axis=1, out=b)
+        return b
+
+    @testing.for_all_dtypes(no_complex=True)
+    @testing.numpy_cupy_array_equal()
+    def test_nanargmax_out_int_dtype(self, xp, dtype):
+        a = xp.array([0, 1])
+        b = xp.empty((), dtype="int64")
+        xp.nanargmax(a, out=b)
+        return b
+
 
 @testing.parameterize(
     *testing.product(
@@ -771,7 +803,7 @@ def test_invalid_sorter(self):
 
     def test_nonint_sorter(self):
         for xp in (numpy, cupy):
-            x = testing.shaped_arange((12,), xp, xp.float32)
+            x = testing.shaped_arange((12,), xp, xp.float64)
             bins = xp.array([10, 4, 2, 1, 8])
             sorter = xp.array([], dtype=xp.float32)
             with pytest.raises((TypeError, ValueError)):
@@ -865,7 +897,7 @@ def test_invalid_sorter(self):
 
     def test_nonint_sorter(self):
         for xp in (numpy, cupy):
-            x = testing.shaped_arange((12,), xp, xp.float32)
+            x = testing.shaped_arange((12,), xp, xp.float64)
             bins = xp.array([10, 4, 2, 1, 8])
             sorter = xp.array([], dtype=xp.float32)
             with pytest.raises((TypeError, ValueError)):