Add zstd scenario to profile uploading tests (#8869)

Author: Matt

dd-java-agent/agent-profiling/profiling-uploader/src/test/java/com/datadog/profiling/uploader/ProfileUploaderTest.java

@@ -52,6 +52,7 @@
 import datadog.trace.relocate.api.IOLogger;
 import datadog.trace.util.PidHelper;
 import delight.fileupload.FileUpload;
+import io.airlift.compress.zstd.ZstdInputStream;
 import java.io.BufferedInputStream;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -337,7 +338,7 @@ public void testZippedInput() throws Exception {
   }
 
   @ParameterizedTest
-  @ValueSource(strings = {"on", "lz4", "gzip", "off", "invalid"})
+  @ValueSource(strings = {"on", "lz4", "gzip", "zstd", "off", "invalid"})
   public void testCompression(final String compression) throws Exception {
     when(config.getApiKey()).thenReturn(null);
     when(config.getProfilingUploadCompression()).thenReturn(compression);
@@ -372,6 +373,8 @@ public void testCompression(final String compression) throws Exception {
     byte[] uploadedBytes = rawJfr.get();
     if (compression.equals("gzip")) {
       uploadedBytes = unGzip(uploadedBytes);
+    } else if (compression.equals("zstd")) {
+      uploadedBytes = unZstd(uploadedBytes);
     } else if (compression.equals("on")
         || compression.equals("lz4")
         || compression.equals("invalid")) {
@@ -895,6 +898,13 @@ private static byte[] unLz4(final byte[] compressed) throws IOException {
     return result.toByteArray();
   }
 
+  private static byte[] unZstd(final byte[] compressed) throws IOException {
+    final InputStream stream = new ZstdInputStream(new ByteArrayInputStream(compressed));
+    final ByteArrayOutputStream result = new ByteArrayOutputStream();
+    ByteStreams.copy(stream, result);
+    return result.toByteArray();
+  }
+
   private void uploadAndWait(final RecordingType recordingType, final RecordingData data)
       throws InterruptedException {
     final CountDownLatch latch = new CountDownLatch(1);