test naming

Author: Brian Chen

packages/firestore/test/unit/remote/serializer.helper.ts

@@ -1001,7 +1001,7 @@ export function serializerTest(
         expect(fromUnaryFilter(actual)).to.deep.equal(input);
       });
 
-      it('converts Nan', () => {
+      it('converts not NaN', () => {
         const input = filter('field', '!=', NaN);
         const actual = toUnaryOrFieldFilter(input);
         expect(actual).to.deep.equal({