Add Go cross-serde tests for CPC sketch

pom.xml

@@ -90,6 +90,7 @@ under the License.
     <!-- these are TestNG groups used for excluding / including groups of tests. See profiles section. -->
     <testng.generate-java-files>generate_java_files</testng.generate-java-files>
     <testng.check-cpp-files>check_cpp_files</testng.check-cpp-files>
+    <testng.check-go-files>check_go_files</testng.check-go-files>
     <testng.check-cpp-historical-files>check_cpp_historical_files</testng.check-cpp-historical-files>
 
     <!-- System-wide properties -->
@@ -623,7 +624,7 @@ under the License.
               <artifactId>maven-surefire-plugin</artifactId>
               <configuration>
                 <groups>${testng.generate-java-files}</groups>
-                <excludedGroups>${testng.check-cpp-files},${testng.check-cpp-historical-files}</excludedGroups>
+                <excludedGroups>${testng.check-cpp-files},${testng.check-go-files},${testng.check-cpp-historical-files}</excludedGroups>
               </configuration>
             </plugin>
           </plugins>
@@ -642,7 +643,26 @@ under the License.
               <artifactId>maven-surefire-plugin</artifactId>
               <configuration>
                 <groups>${testng.check-cpp-files}</groups>
-                <excludedGroups>${testng.generate-java-files},${testng.check-cpp-historical-files}</excludedGroups>
+                <excludedGroups>${testng.generate-java-files},${testng.check-go-files},${testng.check-cpp-historical-files}</excludedGroups>
+              </configuration>
+            </plugin>
+          </plugins>
+        </pluginManagement>
+      </build>
+    </profile>
+
+    <profile>
+      <id>check-go-files</id>
+      <build>
+        <pluginManagement>
+          <plugins>
+            <plugin>
+              <!-- Apache Parent pom, pluginManagement-->
+              <groupId>org.apache.maven.plugins</groupId>
+              <artifactId>maven-surefire-plugin</artifactId>
+              <configuration>
+                <groups>${testng.check-cpp-files}</groups>
+                <excludedGroups>${testng.generate-java-files},${testng.check-cpp-files},${testng.check-cpp-historical-files}</excludedGroups>
               </configuration>
             </plugin>
           </plugins>
@@ -661,7 +681,7 @@ under the License.
               <artifactId>maven-surefire-plugin</artifactId>
               <configuration>
                 <groups>${testng.check-cpp-historical-files}</groups>
-                <excludedGroups>${testng.generate-java-files},${testng.check-cpp-files}</excludedGroups>
+                <excludedGroups>${testng.generate-java-files},${testng.check-go-files},${testng.check-cpp-files}</excludedGroups>
               </configuration>
             </plugin>
           </plugins>

src/main/java/org/apache/datasketches/cpc/CpcSketch.java

@@ -727,7 +727,7 @@ public String toString(final boolean detail) {
     final double errConst = mergeFlag ? log(2) : sqrt(log(2) / 2.0);
     final double rse = errConst / Math.sqrt(1 << lgK);
     final StringBuilder sb = new StringBuilder();
-    sb.append("### CPD SKETCH - PREAMBLE:").append(LS);
+    sb.append("### CPC SKETCH - PREAMBLE:").append(LS);
     sb.append("  Flavor         : ").append(getFlavor()).append(LS);
     sb.append("  LgK            : ").append(lgK).append(LS);
     sb.append("  Merge Flag     : ").append(mergeFlag).append(LS);

src/test/java/org/apache/datasketches/common/TestUtil.java

@@ -47,6 +47,7 @@ public final class TestUtil  {
    */
   public static final String GENERATE_JAVA_FILES = "generate_java_files";
   public static final String CHECK_CPP_FILES = "check_cpp_files";
+  public static final String CHECK_GO_FILES = "check_go_files";
   public static final String CHECK_CPP_HISTORICAL_FILES = "check_cpp_historical_files";
 
   /**
@@ -59,6 +60,11 @@ public final class TestUtil  {
    */
   public static final Path cppPath = createPath("serialization_test_data/cpp_generated_files");
 
+  /**
+   * The full target Path for Go serialized sketches to be tested by Java.
+   */
+  public static final Path goPath = createPath("serialization_test_data/go_generated_files");
+
   private static Path createPath(final String projectLocalDir) {
     try {
       return Files.createDirectories(Paths.get(userDir, projectLocalDir));

src/test/java/org/apache/datasketches/cpc/CpcSketchCrossLanguageTest.java

@@ -20,8 +20,10 @@
 package org.apache.datasketches.cpc;
 
 import static org.apache.datasketches.common.TestUtil.CHECK_CPP_FILES;
+import static org.apache.datasketches.common.TestUtil.CHECK_GO_FILES;
 import static org.apache.datasketches.common.TestUtil.GENERATE_JAVA_FILES;
 import static org.apache.datasketches.common.TestUtil.cppPath;
+import static org.apache.datasketches.common.TestUtil.goPath;
 import static org.apache.datasketches.common.TestUtil.javaPath;
 import static org.testng.Assert.assertEquals;
 
@@ -78,4 +80,17 @@ public void allFlavors() throws IOException {
     }
   }
 
+  @Test(groups = {CHECK_GO_FILES})
+  public void checkAllFlavorsGo() throws IOException {
+    final int[] nArr = {0, 100, 200, 2000, 20000};
+    final Flavor[] flavorArr = {Flavor.EMPTY, Flavor.SPARSE, Flavor.HYBRID, Flavor.PINNED, Flavor.SLIDING};
+    int flavorIdx = 0;
+    for (int n: nArr) {
+      final byte[] bytes = Files.readAllBytes(goPath.resolve("cpc_n" + n + "_go.sk"));
+      final CpcSketch sketch = CpcSketch.heapify(Memory.wrap(bytes));
+      assertEquals(sketch.getFlavor(), flavorArr[flavorIdx++]);
+      assertEquals(sketch.getEstimate(), n, n * 0.02);
+    }
+  }
+
 }