Remove static of timestamp formatter

Author: courtneyeh

Diff for: ethereum/statetransition/src/main/java/tech/pegasys/teku/statetransition/util/DebugDataDumper.java

@@ -141,7 +141,7 @@ private void createDirectory(
   }
 
   @VisibleForTesting
-  static String formatTimestamp(final Optional<UInt64> arrivalTimestamp) {
+  String formatTimestamp(final Optional<UInt64> arrivalTimestamp) {
     if (arrivalTimestamp.isEmpty()) {
       return "unknown";
     }

Diff for: ethereum/statetransition/src/test/java/tech/pegasys/teku/statetransition/util/DebugDataDumperTest.java

@@ -47,8 +47,7 @@ void saveGossipMessageDecodingError_shouldSaveToFile(@TempDir Path tempDir) {
     final String topic = "test_topic";
     manager.saveGossipMessageDecodingError("test_topic", arrivalTimestamp, messageBytes);
 
-    final String fileName =
-        String.format("%s.ssz", DebugDataDumper.formatTimestamp(arrivalTimestamp));
+    final String fileName = String.format("%s.ssz", manager.formatTimestamp(arrivalTimestamp));
     final Path expectedFile =
         tempDir
             .resolve("gossip_messages")
@@ -66,8 +65,7 @@ void saveGossipMessageDecodingError_shouldNotSaveToFileWhenDisabled(@TempDir Pat
     manager.saveGossipMessageDecodingError("test_topic", arrivalTimestamp, messageBytes);
     assertThat(manager.isEnabled()).isFalse();
 
-    final String fileName =
-        String.format("%s.ssz", DebugDataDumper.formatTimestamp(arrivalTimestamp));
+    final String fileName = String.format("%s.ssz", manager.formatTimestamp(arrivalTimestamp));
     final Path expectedFile =
         tempDir.resolve("gossip_messages").resolve("decoding_error").resolve(fileName);
     checkFileNotExist(expectedFile);
@@ -81,8 +79,7 @@ void saveGossipRejectedMessageToFile_shouldSaveToFile(@TempDir Path tempDir) {
     final String topic = "test_topic";
     manager.saveGossipRejectedMessageToFile("test_topic", arrivalTimestamp, messageBytes);
 
-    final String fileName =
-        String.format("%s.ssz", DebugDataDumper.formatTimestamp(arrivalTimestamp));
+    final String fileName = String.format("%s.ssz", manager.formatTimestamp(arrivalTimestamp));
     final Path expectedFile =
         tempDir.resolve("gossip_messages").resolve("rejected").resolve(topic).resolve(fileName);
     checkBytesSavedToFile(expectedFile, messageBytes);
@@ -157,14 +154,16 @@ void constructionOfDirectories_shouldDisableWhenFailedToCreate(@TempDir Path tem
 
   @Test
   void formatTimestamp_shouldFormatDate() {
+    final DebugDataDumper manager = new DebugDataDumper(Path.of("."), true);
     final String formattedTimestamp =
-        DebugDataDumper.formatTimestamp(Optional.of(timeProvider.getTimeInMillis()));
+        manager.formatTimestamp(Optional.of(timeProvider.getTimeInMillis()));
     assertThat(formattedTimestamp).isEqualTo("1970-01-01T12:46:40.00");
   }
 
   @Test
   void formatTimestamp_shouldReturnConsistentUnknown() {
-    final String formattedTimestamp = DebugDataDumper.formatTimestamp(Optional.empty());
+    final DebugDataDumper manager = new DebugDataDumper(Path.of("."), true);
+    final String formattedTimestamp = manager.formatTimestamp(Optional.empty());
     assertThat(formattedTimestamp).isEqualTo("unknown");
   }