Create validation to aggregate

Signed-off-by: Otavio Santana <[email protected]>

Author: otaviojava

mongodb-driver/src/test/java/org/eclipse/jnosql/communication/mongodb/document/MongoDBSpecificFeaturesTest.java

@@ -27,6 +27,7 @@
 import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -99,6 +100,19 @@ public void shouldDelete() {
         Assertions.assertTrue(entities.isEmpty());
     }
 
+    @Test
+    public void shouldReturnErrorOnAggregateWhenThereIsNullParameter(){
+        Assertions.assertThrows(NullPointerException.class,
+                () -> entityManager.aggregate(null, null));
+        Assertions.assertThrows(NullPointerException.class,
+                () -> entityManager.aggregate(COLLECTION_NAME, null));
+
+        Assertions.assertThrows(NullPointerException.class,
+                () -> entityManager.aggregate(null,
+                        Collections.singletonList(eq("name", "Poliana"))));
+    }
+
+
     private DocumentEntity getEntity() {
         DocumentEntity entity = DocumentEntity.of(COLLECTION_NAME);
         Map<String, Object> map = new HashMap<>();