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aws-sdk-go-v2 - Unit-Testing - Mocking Paginators - `mockListObjectsV2Pager` satisfies `ListObjectsV2Pager` Interface Definition

CL answered on March 1, 2023 Popularity 1/10 Helpfulness 1/10

answer aws-sdk-go-v2 - Unit-Testing - Mocking Paginators - `mockListObjectsV2Pager` satisfies `ListObjectsV2Pager` Interface Definition

aws-sdk-go-v2 - Unit-Testing - Mocking Paginators - `mockListObjectsV2Pager` satisfies `ListObjectsV2Pager` Interface Definition

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import "context"
import	"fmt"
import "testing"
import "github.com/aws/aws-sdk-go-v2/service/s3"

// ...

type mockListObjectsV2Pager struct {
	PageNum int
	Pages   []*s3.ListObjectsV2Output
}

func (m *mockListObjectsV2Pager) HasMorePages() bool {
	return m.PageNum < len(m.Pages)
}

func (m *mockListObjectsV2Pager) NextPage(ctx context.Context, f ...func(*s3.Options)) (output *s3.ListObjectsV2Output, err error) {
	if m.PageNum >= len(m.Pages) {
		return nil, fmt.Errorf("no more pages")
	}
	output = m.Pages[m.PageNum]
	m.PageNum++
	return output, nil
}

func TestCountObjects(t *testing.T) {
	pager := &mockListObjectsV2Pager{
		Pages: []*s3.ListObjectsV2Output{
			{
				KeyCount: 5,
			},
			{
				KeyCount: 10,
			},
			{
				KeyCount: 15,
			},
		},
	}
	objects, err := CountObjects(context.TODO(), pager)
	if err != nil {
		t.Fatalf("expect no error, got %v", err)
	}
	if expect, actual := 30, objects; expect != actual {
		t.Errorf("expect %v, got %v", expect, actual)
	}
}

To test `CountObjects`, create the `mockListObjectsV2Pager` type to satisfy the `ListObjectsV2Pager` interface definition. Then use `mockListObjectsV2Pager` to replicate the paging behavior of output and error responses from the service operation paginator.

Popularity 1/10 Helpfulness 1/10 Language go

Source: aws.github.io

Tags: aws-sdk-go-v2 definition go interface mocking unit-testing

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Contributed on Mar 01 2023

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aws-sdk-go-v2 - Unit-Testing - Mocking Paginators - `mockListObjectsV2Pager` satisfies `ListObjectsV2Pager` Interface Definition

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aws-sdk-go-v2 - Unit-Testing - Mocking Paginators - `mockListObjectsV2Pager` satisfies `ListObjectsV2Pager` Interface Definition

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