better formatting remoteconfigmanagertest

Author: leotianlizhan

firebase-perf/src/test/java/com/google/firebase/perf/config/RemoteConfigManagerTest.java

@@ -37,7 +37,6 @@
 import com.google.testing.timing.FakeScheduledExecutorService;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
 import org.junit.Before;
 import org.junit.Test;
@@ -60,16 +59,15 @@ public final class RemoteConfigManagerTest extends FirebasePerformanceTestBase {
   @Mock private Provider<RemoteConfigComponent> mockFirebaseRemoteConfigProvider;
 
   private DeviceCacheManager cacheManager;
-  private ExecutorService directExecutor;
   private FakeScheduledExecutorService fakeExecutor;
 
   @Before
   public void setUp() {
     initMocks(this);
 
     fakeExecutor = new FakeScheduledExecutorService();
-    directExecutor = MoreExecutors.newDirectExecutorService();
-    cacheManager = new DeviceCacheManager(directExecutor);
+    // DeviceCacheManager initialization requires immediate blocking task execution in its executor
+    cacheManager = new DeviceCacheManager(MoreExecutors.newDirectExecutorService());
 
     when(mockFirebaseRemoteConfigProvider.get()).thenReturn(mockFirebaseRemoteConfigComponent);
     when(mockFirebaseRemoteConfigComponent.get(FIREPERF_FRC_NAMESPACE_NAME))