FIRQueryTests.mm: more work; just need to compare actual/expected sets

Author: dconeybe

Firestore/Example/Tests/Integration/API/FIRQueryTests.mm

@@ -22,6 +22,16 @@
 #import "Firestore/Example/Tests/Util/FSTHelpers.h"
 #import "Firestore/Example/Tests/Util/FSTIntegrationTestCase.h"
 
+namespace {
+
+NSArray<NSString*>* SortedStringsNotIn(NSSet<NSString*>* set, NSSet<NSString*>* remove) {
+  NSMutableSet<NSString*>* mutableSet = [NSMutableSet setWithSet:set];
+  [mutableSet minusSet:remove];
+  return [mutableSet sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"description" ascending:YES]]];
+}
+
+}  // namespace
+
 @interface FIRQueryTests : FSTIntegrationTestCase
 @end
 
@@ -1240,6 +1250,30 @@ - (void)testResumingAQueryShouldUseExistenceFilterToDetectDeletes {
   // existence filter, resulting in the client including the deleted documents in the snapshot
   // of the resumed query.
   if (!([FSTIntegrationTestCase isRunningAgainstEmulator] && querySnapshot2.count == 100)) {
+    NSSet<NSString*>* actualDocumentIds;
+    {
+      NSMutableSet<NSString*>* actualDocumentIdsAccumulator = [[NSMutableSet alloc] init];
+      for (FIRDocumentSnapshot* documentSnapshot in querySnapshot2.documents) {
+        [actualDocumentIdsAccumulator addObject:documentSnapshot.documentID];
+      }
+      actualDocumentIds = [actualDocumentIdsAccumulator copy];
+    }
+    NSSet<NSString*>* expectedDocumentIds;
+    {
+      NSMutableSet<NSString*>* expectedDocumentIdsAccumulator = [[NSMutableSet alloc] init];
+      for (FIRDocumentReference* documentRef in createdDocuments) {
+        if (![deletedDocumentIds containsObject:documentRef.documentID]) {
+          [expectedDocumentIdsAccumulator addObject:documentRef.documentID];
+        }
+      }
+      expectedDocumentIds = [expectedDocumentIdsAccumulator copy];
+    }
+    if (! [actualDocumentIds isEqualToSet:expectedDocumentIds]) {
+      NSArray<NSString*>* unexpectedDocumentIds = SortedStringsNotIn(actualDocumentIds, expectedDocumentIds);
+      NSArray<NSString*>* missingDocumentIds = SortedStringsNotIn(expectedDocumentIds, actualDocumentIds);
+      (void)unexpectedDocumentIds;
+      (void)missingDocumentIds;
+    }
   }
 }