Removed unused TestHelper methods (#650)

Author: schmidt-sebastian

firebase-firestore/ktx/src/test/java/com/google/firebase/firestore/TestAccessHelper.java

@@ -19,21 +19,17 @@
 import static com.google.firebase.firestore.testutil.TestUtil.key;
 import static org.mockito.Mockito.mock;
 
-import com.google.android.gms.tasks.Task;
 import com.google.firebase.database.collection.ImmutableSortedSet;
 import com.google.firebase.firestore.core.DocumentViewChange;
 import com.google.firebase.firestore.core.DocumentViewChange.Type;
 import com.google.firebase.firestore.core.ViewSnapshot;
 import com.google.firebase.firestore.model.Document;
 import com.google.firebase.firestore.model.DocumentKey;
 import com.google.firebase.firestore.model.DocumentSet;
-import com.google.firebase.firestore.model.ResourcePath;
 import com.google.firebase.firestore.model.value.ObjectValue;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
-import org.junit.Assert;
-import org.robolectric.Robolectric;
 
 public class TestUtil {
 
@@ -43,14 +39,6 @@ public static FirebaseFirestore firestore() {
     return FIRESTORE;
   }
 
-  public static CollectionReference collectionReference(String path) {
-    return new CollectionReference(ResourcePath.fromString(path), FIRESTORE);
-  }
-
-  public static DocumentReference documentReference(String path) {
-    return new DocumentReference(key(path), FIRESTORE);
-  }
-
   public static DocumentSnapshot documentSnapshot(
       String path, Map<String, Object> data, boolean isFromCache) {
     if (data == null) {
@@ -133,13 +121,4 @@ public static QuerySnapshot querySnapshot(
             /* excludesMetadataChanges= */ false);
     return new QuerySnapshot(query(path), viewSnapshot, FIRESTORE);
   }
-
-  public static <T> T waitFor(Task<T> task) {
-    if (!task.isComplete()) {
-      Robolectric.flushBackgroundThreadScheduler();
-    }
-    Assert.assertTrue(
-        "Expected task to be completed after background thread flush", task.isComplete());
-    return task.getResult();
-  }
 }