You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: attachments_test.go
    path of file: ./repos/slack
    
    the code of the file until where you have to start completion: package slack

import (
	"encoding/json"
	"strings"
	"testing"

	"github.com/go-test/deep"
)

func TestAttachment_UnmarshalMarshalJSON_WithBlocks(t *testing.T) {

	originalAttachmentJson := `{
    "id": 1,
    "blocks": [
      {
        "type": "section",
        "block_id": "xxxx",
        "text": {
          "type": "mrkdwn",
    
    
func TestAttachment_UnmarshalMarshalJSON_WithBlocks(t *testing.T) {

	originalAttachmentJson := `{
    "id": 1,
    "blocks": [
      {
        "type": "section",
        "block_id": "xxxx",
        "text": {
          "type": "mrkdwn",
          "text": "Pick something:",
          "verbatim": true
        },
        "accessory": {
          "type": "static_select",
          "action_id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
          "placeholder": {
            "type": "plain_text",
            "text": "Select one item",
            "emoji": true
          },
          "options": [
            {
              "text": {
                "type": "plain_text",
                "text": "ghi",
                "emoji": true
              },
              "value": "ghi"
            }
          ]
        }
      }
    ],
    "color": "#13A554",
    "fallback": "[no preview available]"
  }`

	attachment := new(Attachment)
	err := json.Unmarshal([]byte(originalAttachmentJson), attachment)
	if err != nil {
		t.Fatalf("expected no error unmarshaling attachment with blocks, got: %v", err)
	}

	actualAttachmentJson, err := json.Marshal(attachment)
	if err != nil {
		t.Fatal(err)
	}

	var (
		actual   interface{}
		expected interface{}
	)
	if err = json.Unmarshal([]byte(originalAttachmentJson), &expected); err != nil {
		t.Fatal(err)
	}
	if err = json.Unmarshal(actualAttachmentJson, &actual); err != nil {
		t.Fatal(err)
	}
	if diff := deep.Equal(actual, expected); diff != nil {
		t.Fatal("actual does not match expected\n", strings.Join(diff, "\n"))
	}
}