AOD sketch compatibility test

tuple/test/CMakeLists.txt

@@ -46,3 +46,10 @@ target_sources(tuple_test
     array_of_doubles_sketch_test.cpp
     engagement_test.cpp
 )
+
+if (SERDE_COMPAT)
+target_sources(tuple_test
+  PRIVATE
+    aod_sketch_deserialize_from_java_test.cpp
+)
+endif()

tuple/test/aod_sketch_deserialize_from_java_test.cpp

@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 <catch2/catch.hpp>
+#include <fstream>
+#include <array_of_doubles_sketch.hpp>
+
+namespace datasketches {
+
+// assume the binary sketches for this test have been generated by datasketches-java code
+// in the subdirectory called "java" in the root directory of this project
+static std::string testBinaryInputPath = std::string(TEST_BINARY_INPUT_PATH) + "../../java/";
+
+TEST_CASE("aod sketch one value", "[serde_compat]") {
+  unsigned n_arr[] = {0, 1, 10, 100, 1000, 10000, 100000, 1000000};
+  for (unsigned n: n_arr) {
+    std::ifstream is;
+    is.exceptions(std::ios::failbit | std::ios::badbit);
+    is.open(testBinaryInputPath + "aod_1_n" + std::to_string(n) + ".sk", std::ios::binary);
+    auto sketch = compact_array_of_doubles_sketch::deserialize(is);
+    REQUIRE(sketch.is_empty() == (n == 0));
+    REQUIRE(sketch.is_estimation_mode() == (n > 1000));
+    REQUIRE(sketch.get_estimate() == Approx(n).margin(n * 0.03));
+    REQUIRE(sketch.get_num_values() == 1);
+    for (const auto& entry: sketch) {
+      REQUIRE(entry.first < sketch.get_theta64());
+    }
+  }
+}
+
+TEST_CASE("aod sketch three values", "[serde_compat]") {
+  unsigned n_arr[] = {0, 1, 10, 100, 1000, 10000, 100000, 1000000};
+  for (unsigned n: n_arr) {
+    std::ifstream is;
+    is.exceptions(std::ios::failbit | std::ios::badbit);
+    is.open(testBinaryInputPath + "aod_3_n" + std::to_string(n) + ".sk", std::ios::binary);
+    auto sketch = compact_array_of_doubles_sketch::deserialize(is);
+    REQUIRE(sketch.is_empty() == (n == 0));
+    REQUIRE(sketch.is_estimation_mode() == (n > 1000));
+    REQUIRE(sketch.get_estimate() == Approx(n).margin(n * 0.03));
+    REQUIRE(sketch.get_num_values() == 3);
+    for (const auto& entry: sketch) {
+      REQUIRE(entry.first < sketch.get_theta64());
+      REQUIRE(entry.second[0] == entry.second[1]);
+      REQUIRE(entry.second[0] == entry.second[2]);
+    }
+  }
+}
+
+TEST_CASE("aod sketch non-empty no entries", "[serde_compat]") {
+  std::ifstream is;
+  is.exceptions(std::ios::failbit | std::ios::badbit);
+  is.open(testBinaryInputPath + "aod_1_non_empty_no_entries.sk", std::ios::binary);
+  auto sketch = compact_array_of_doubles_sketch::deserialize(is);
+  REQUIRE_FALSE(sketch.is_empty());
+  REQUIRE(sketch.get_num_retained() == 0);
+}
+
+} /* namespace datasketches */