add device_views device test

Author: upsj

test/matrix/CMakeLists.txt

@@ -5,6 +5,7 @@ ginkgo_create_common_device_test(csr_kernels)
 ginkgo_create_common_test(csr_kernels2)
 ginkgo_create_common_test(coo_kernels)
 ginkgo_create_common_test(dense_kernels)
+ginkgo_create_common_device_test(device_views)
 ginkgo_create_common_test(diagonal_kernels)
 ginkgo_create_common_test(ell_kernels)
 ginkgo_create_common_test(fbcsr_kernels DISABLE_EXECUTORS dpcpp)

test/matrix/device_views.cpp

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2017 - 2026 The Ginkgo authors
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+/*@GKO_PREPROCESSOR_FILENAME_HELPER@*/
+
+#include <type_traits>
+
+#include <gtest/gtest.h>
+
+#include "common/unified/base/kernel_launch.hpp"
+#include "core/base/array_access.hpp"
+#include "core/test/utils.hpp"
+#include "test/utils/common_fixture.hpp"
+
+
+template <typename ValueType>
+class DenseView : public CommonTestFixture {
+public:
+    using value_type = ValueType;
+    using view_type = gko::matrix::view::dense<value_type>;
+};
+
+TYPED_TEST_SUITE(DenseView, gko::test::ValueTypes, TypenameNameGenerator);
+
+
+template <typename ValueType>
+void assert_dense_view(std::shared_ptr<const gko::EXEC_TYPE> exec)
+{
+    gko::array<bool> correct{exec, {false}};
+    gko::array<ValueType> values{exec, 5};
+    values.fill(gko::one<ValueType>());
+    gko::kernels::GKO_DEVICE_NAMESPACE::run_kernel(
+        exec,
+        [] GKO_KERNEL(auto i, auto values, auto correct) {
+            using device_type = std::decay_t<decltype(values[0])>;
+            gko::matrix::view::dense<device_type> view{gko::dim<2>{1, 2}, 3,
+                                                       values};
+            if (view.size == gko::dim<2>(1, 2) && view.stride == 3 &&
+                view.data == values && &view(0, 0) == &values[0] &&
+                &view(1, 0) == &values[3] && &view(1, 1) == &values[4] &&
+                view(1, 1) == gko::one(view(1, 1))) {
+                *correct = true;
+            }
+        },
+        1, values, correct);
+    ASSERT_TRUE(get_element(correct, 0));
+}
+
+TYPED_TEST(DenseView, WorksOnDevice)
+{
+    assert_dense_view<TypeParam>(this->exec);
+}