[cloud_firestore] Fix wrong FieldValue (#1543)

* [cloud_firestore] Fix wrong FieldValue * Update integration test to catch increment

Author: creativecreatorormaybenot

packages/cloud_firestore/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java

@@ -654,8 +654,8 @@ final class FirestoreMessageCodec extends StandardMessageCodec {
  private static final byte DELETE = (byte) 134;
  private static final byte SERVER_TIMESTAMP = (byte) 135;
  private static final byte TIMESTAMP = (byte) 136;
- private static final byte INCREMENT_INTEGER = (byte) 137;
- private static final byte INCREMENT_DOUBLE = (byte) 138;
+ private static final byte INCREMENT_DOUBLE = (byte) 137;
+ private static final byte INCREMENT_INTEGER = (byte) 138;
 
  @Override
  protected void writeValue(ByteArrayOutputStream stream, Object value) {

packages/cloud_firestore/example/test_driver/cloud_firestore.dart

@@ -54,10 +54,10 @@ void main() {
  snapshot = await ref.get();
  expect(snapshot.data['message'], 2);
  await ref.updateData(<String, dynamic>{
- 'message': FieldValue.increment(40.0),
+ 'message': FieldValue.increment(40.1),
  });
  snapshot = await ref.get();
- expect(snapshot.data['message'], 42.0);
+ expect(snapshot.data['message'], 42.1);
  await ref.delete();
  });