jsonprc4j attack test

attacker/client/src/test/java/tech/pegasys/teku/attacker/AttackServiceTest.java

+package tech.pegasys.teku.attacker;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class AttackServiceTest {
+
+    private AttackService attackService;
+
+    @Test
+    public void blockGetNewParentRoot() {
+        long slot = 1L;
+        String pub = "";
+        String parentRoot = "";
+        SafeFuture<AttackerResponse>  attackerResponse = attackService.blockGetNewParentRoot(slot, pub, parentRoot);
+        assertThat(attackerResponse.get().getCommond().getValue).(AttackerCommand.CMD_CONTINUE.getValue()s);
+    }
+}