Add xxhash32 tests

cpp/tests/CMakeLists.txt

@@ -190,6 +190,7 @@ ConfigureTest(
   hashing/sha256_test.cpp
   hashing/sha384_test.cpp
   hashing/sha512_test.cpp
+  hashing/xxhash_32_test.cpp
   hashing/xxhash_64_test.cpp
 )
 

cpp/tests/hashing/xxhash_32_test.cpp

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <cudf_test/base_fixture.hpp>
+#include <cudf_test/column_utilities.hpp>
+#include <cudf_test/column_wrapper.hpp>
+#include <cudf_test/type_lists.hpp>
+
+#include <cudf/hashing.hpp>
+
+class XXHash_32_Test : public cudf::test::BaseFixture {};
+
+TEST_F(XXHash_32_Test, TestInteger)
+{
+  auto col1           = cudf::test::fixed_width_column_wrapper<int32_t>{{0, 42, 825}};
+  auto constexpr seed = 0u;
+  auto const output   = cudf::hashing::xxhash_32(cudf::table_view({col1}), seed);
+
+  // Checking against the reference implementation:
+  // https://github.com/Cyan4973/xxHash/blob/dev/xxhash.h
+  auto expected =
+    cudf::test::fixed_width_column_wrapper<uint32_t>({148298089u, 1161967057u, 1066694813u});
+  CUDF_TEST_EXPECT_COLUMNS_EQUAL(output->view(), expected);
+}
+
+TEST_F(XXHash_32_Test, TestDouble)
+{
+  auto col1           = cudf::test::fixed_width_column_wrapper<double>{{-8., 25., 90.}};
+  auto constexpr seed = 42u;
+
+  auto const output = cudf::hashing::xxhash_32(cudf::table_view({col1}), seed);
+
+  // Checking against the reference implementation:
+  // https://github.com/Cyan4973/xxHash/blob/dev/xxhash.h
+  auto expected =
+    cudf::test::fixed_width_column_wrapper<uint32_t>({2276435783u, 3120212431u, 3454197470u});
+
+  CUDF_TEST_EXPECT_COLUMNS_EQUAL(output->view(), expected);
+}
+
+TEST_F(XXHash_32_Test, StringType)
+{
+  auto col1           = cudf::test::strings_column_wrapper({"I", "am", "AI"});
+  auto constexpr seed = 825u;
+
+  auto output = cudf::hashing::xxhash_32(cudf::table_view({col1}), seed);
+
+  // Checking against the reference implementation:
+  // https://github.com/Cyan4973/xxHash/blob/dev/xxhash.h
+  auto expected =
+    cudf::test::fixed_width_column_wrapper<uint32_t>({320624298u, 1612654309u, 1409499009u});
+
+  CUDF_TEST_EXPECT_COLUMNS_EQUAL(output->view(), expected);
+}