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: sender_test.go
    path of file: ./repos/jaeles/core
    
    the code of the file until where you have to start completion: package core

import (
	"github.com/jaeles-project/jaeles/sender"
	"strings"
	"testing"

	"github.com/jaeles-project/jaeles/libs"
)

func TestReallySending(t *testing.T) {
	var headers []map[string]string
	var req libs.Request
	headers = append(headers, map[string]string{
		"Content-Type": "application/json",
	})

	req.Method = "POST"
	req.URL = "https://httpbin.org/post"
	req.Headers = headers

	var opt libs.Options
	// opt.Proxy = "http://127.0.0.1:8080"
	res, err := sender.JustSend(opt, req)
	if err != nil {
		t.Errorf("Error sending request")
	}

	status := res.StatusCode
	if status != 200 {
		t.Errorf("Error parsing result")
	}
	// sending wi
    
func TestReallySending(t *testing.T) {
	var headers []map[string]string
	var req libs.Request
	headers = append(headers, map[string]string{
		"Content-Type": "application/json",
	})

	req.Method = "POST"
	req.URL = "https://httpbin.org/post"
	req.Headers = headers

	var opt libs.Options
	// opt.Proxy = "http://127.0.0.1:8080"
	res, err := sender.JustSend(opt, req)
	if err != nil {
		t.Errorf("Error sending request")
	}

	status := res.StatusCode
	if status != 200 {
		t.Errorf("Error parsing result")
	}
	// sending with POST data
	req.Body = "example1=23"
	res, err = sender.JustSend(opt, req)
	if err != nil {
		t.Errorf("Error sending request")
	}

	if !strings.Contains(res.Body, "example1") {
		t.Errorf("Error parsing result")
	}

	req.Body = `{"example1": "3333"}`
	res, err = sender.JustSend(opt, req)
	if err != nil {
		t.Errorf("Error sending request")
	}

	if !strings.Contains(res.Body, "example1") {
		t.Errorf("Error parsing result")
	}
}