Python 如何使用pytest模拟boto3自定义类方法？

我不确定是否应该使用moto、Stubber或修补模拟类，因为我的类是定制的。我应该如何为下面的类编写测试

aws.py：

import boto3
    

class MyAWSClass:
    def __init__(self, profile_name):
        self.session = boto3.Session(profile_name=profile_name)
    
    def get_instances(self, region_name):
        """Returns a list of instances"""
        client = self.session.client("ec2", region_name=region_name)
        reservations = client.describe_instances()["Reservations"]
        instances = []
        for reservation in reservations:
            instances.extend(reservation["Instances"])
        return instances

    def create_tags(self, dry_run, resources, tags, region_name):
        """Create tags"""
        client = self.session.client("ec2", region_name=region_name)
        response = client.create_tags(DryRun=dry_run, Resources=resources, Tags=tags)
        return response

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Moto应该可以很好地模仿这一点