full sync for dev network (#1128)

Signed-off-by: Ratan Rai Sur <ratan.r.sur@gmail.com>

besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java

@@ -1383,7 +1383,10 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
   private BesuCommand configure() throws Exception {
     syncMode =
         Optional.ofNullable(syncMode)
-            .orElse(genesisFile == null && !isPrivacyEnabled ? SyncMode.FAST : SyncMode.FULL);
+            .orElse(
+                genesisFile == null && !isPrivacyEnabled && network != NetworkName.DEV
+                    ? SyncMode.FAST
+                    : SyncMode.FULL);
     ethNetworkConfig = updateNetworkConfig(getNetwork());
     jsonRpcConfiguration = jsonRpcConfiguration();
     graphQLConfiguration = graphQLConfiguration();

besu/src/test/java/org/hyperledger/besu/cli/BesuCommandTest.java

@@ -1246,6 +1246,18 @@ public class BesuCommandTest extends CommandTestAbstract {
     assertThat(commandErrorOutput.toString()).isEmpty();
   }
 
+  @Test
+  public void syncMode_full_by_default_for_dev() {
+    parseCommand("--network", "dev");
+    verify(mockControllerBuilder).synchronizerConfiguration(syncConfigurationCaptor.capture());
+
+    final SynchronizerConfiguration syncConfig = syncConfigurationCaptor.getValue();
+    assertThat(syncConfig.getSyncMode()).isEqualTo(SyncMode.FULL);
+
+    assertThat(commandOutput.toString()).isEmpty();
+    assertThat(commandErrorOutput.toString()).isEmpty();
+  }
+
   @Test
   public void helpShouldDisplayFastSyncOptions() {
     parseCommand("--help");