address feedbacks

Author: cherylEnkidu

Firestore/Swift/Tests/Integration/PipelineTests.swift

@@ -2507,7 +2507,11 @@ class PipelineIntegrationTests: FSTIntegrationTestCase {
       .limit(1)
       .select(
         [
+          Field("rating").equal(Constant.nil).as("ratingIsNull"),
+          Field("rating").equal(Constant(Double.nan)).as("ratingIsNaN"),
           Field("foo").isAbsent().as("isAbsent"),
+          Field("title").notEqual(Constant.nil).as("titleIsNotNull"),
+          Field("cost").notEqual(Constant(Double.nan)).as("costIsNotNan"),
           Field("fooBarBaz").exists().as("fooBarBazExists"),
           Field("title").exists().as("titleExists"),
         ]
@@ -2518,7 +2522,11 @@ class PipelineIntegrationTests: FSTIntegrationTestCase {
 
     if let resultDoc = snapshot.results.first {
       let expectedResults: [String: Sendable?] = [
+        "ratingIsNull": false,
+        "ratingIsNaN": false,
         "isAbsent": true,
+        "titleIsNotNull": true,
+        "costIsNotNan": false,
         "fooBarBazExists": false,
         "titleExists": true,
       ]