Similar to service clients, paginators can be mocked by defining a Go interface for the paginator. That interface would be used by your application’s code. This allows the SDK’s implementation to be used when your application is running, and a mocked implementation for testing.

In the following example, `ListObjectsV2Pager` is an interface that defines the behaviors for the Amazon S3 [ListObjectsV2Paginator](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#ListObjectsV2Paginator). required by `CountObjects` function. 

In this example, `S3GetObjectAPI` is an interface that defines the set of Amazon S3 API operations required by the `GetObjectFromS3` function. `S3GetObjectAPI` is satisfied by the Amazon S3 client’s [GetObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObject) method.