@darshan-majithiya had opened #15429 to add the hyperparameter tuning PR but it's gone stale. I'm adding this issue to see if they want to pick it back up, or if not, if someone wants to pick up where they left off in the spirit of open source 😄 
tests/providers/google/cloud/operators/test_mlengine.py
#
#
import copy
import datetime
import unittest
from unittest.mock import ANY, MagicMock, patch
import httplib2
import pytest
from googleapiclient.errors import HttpError
from airflow.exceptions import AirflowException
from airflow.models import TaskInstance
from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.mlengine import (
    AIPlatformConsoleLink,
    MLEngineCreateModelOperator,
    MLEngineCreateVersionOperator,