[tests][firestore] Add test for onSnapshot with a query applied

tests/ios/Podfile.lock

@@ -150,7 +150,7 @@ PODS:
     - React/Core
     - React/fishhook
     - React/RCTBlob
-  - RNFirebase (3.1.0-alpha.1):
+  - RNFirebase (3.1.0):
     - React
   - yoga (0.49.1.React)
 
@@ -176,11 +176,11 @@ DEPENDENCIES:
 
 EXTERNAL SOURCES:
   React:
-    :path: ../node_modules/react-native
+    :path: "../node_modules/react-native"
   RNFirebase:
-    :path: ./../../
+    :path: "./../../"
   yoga:
-    :path: ../node_modules/react-native/ReactCommon/yoga
+    :path: "../node_modules/react-native/ReactCommon/yoga"
 
 SPEC CHECKSUMS:
   BoringSSL: 19083b821ef3ae0f758fae15482e183003b1e265
@@ -199,7 +199,7 @@ SPEC CHECKSUMS:
   FirebaseStorage: 0cca42d9b889a0227c3a50121f45a4469fc9eb27
   Google-Mobile-Ads-SDK: ed8004a7265b424568dc84f3d2bbe3ea3fff958f
   GoogleToolboxForMac: 8e329f1b599f2512c6b10676d45736bcc2cbbeb0
-  gRPC: 07788969b862af21491908f82b83d17ac08c94cd
+  gRPC: '07788969b862af21491908f82b83d17ac08c94cd'
   gRPC-Core: f707ade59c559fe718e27713189607d03b15f571
   gRPC-ProtoRPC: de7505e493a9d1b6b96c8ea8f976c73100fdf53f
   gRPC-RxLibrary: 17b9699beb0a838b95b57832244f9ead18e66777
@@ -208,9 +208,9 @@ SPEC CHECKSUMS:
   nanopb: 5601e6bca2dbf1ed831b519092ec110f66982ca3
   Protobuf: 03eef2ee0b674770735cf79d9c4d3659cf6908e8
   React: cf892fb84b7d06bf5fea7f328e554c6dcabe85ee
-  RNFirebase: 0467ca8122b9257acd7f1bb6de1670d9fd51cede
+  RNFirebase: a76befd482c5e84df7f69893358abda498ee9f76
   yoga: 3abf02d6d9aeeb139b4c930eb1367feae690a35a
 
 PODFILE CHECKSUM: b5674be55653f5dda937c8b794d0479900643d45
 
-COCOAPODS: 1.3.1
+COCOAPODS: 1.2.1

tests/src/tests/firestore/collectionReferenceTests.js

@@ -737,6 +737,43 @@ function collectionReferenceTests({ describe, it, context, firebase, before, aft
         });
       });
 
+      context('onSnapshot()', () => {
+        it('gets called correctly', async () => {
+          const collectionRef = collectionTests.orderBy('timestamp').endAt(new Date(2017, 2, 12, 10, 0, 0));
+          const newDocValue = { ...COL_1, foo: 'updated' };
+
+          const callback = sinon.spy();
+
+          // Test
+
+          let unsubscribe;
+          await new Promise((resolve2) => {
+            unsubscribe = collectionRef.onSnapshot((snapshot) => {
+              callback(snapshot.docs.map(doc => doc.data().daz));
+              resolve2();
+            });
+          });
+
+          callback.should.be.calledWith([123, 234, 345]);
+
+          const docRef = firebase.native.firestore().doc('collection-tests2/col1');
+          await docRef.set(newDocValue);
+
+          await new Promise((resolve2) => {
+            setTimeout(() => resolve2(), 5);
+          });
+
+          // Assertions
+
+          callback.should.be.calledWith([123, 234, 345]);
+          callback.should.be.calledTwice();
+
+          // Tear down
+
+          unsubscribe();
+        });
+      });
+
       after(() => {
         return cleanCollection(collectionTests);
       });