golang setup closure example

my_test.go

package main_test

import (
	"net/http/httptest"
	"testing"
	"time"
)

type Bag struct {
	Holding int
}

var (
	server *httptest.Server
	bag    *Bag
)

func setup() {
	// should actually be my http handler that I am testing
	server = httptest.NewServer(nil)
	bag = &Bag{}
}

func teardown() {
	server.Close()
}

func TestSomething(t *testing.T) {
	setup()
	defer teardown()

	t.Logf("after setup bag=%+v", bag)

	time.Sleep(500 * time.Millisecond)
	t.Logf("%+v", *server)

	t.Logf("before assign bag=%+v", bag)
	bag.Holding = 1
	t.Logf("after assign bag=%+v", bag)

	t.Log(server.URL)
}

func TestSomethingElse(t *testing.T) {
	setup()
	defer teardown()

	t.Logf("after setup bag=%+v", bag)

	time.Sleep(1 * time.Second)
	t.Logf("%+v", *server)

	t.Logf("before assign bag=%+v", bag)
	bag.Holding = 5
	t.Logf("after assign bag=%+v", bag)

	t.Log(server.URL)
}

output.txt

[ `go test -parallel=2 -v -race my_test.go` | done: 6.875938401s ]
  === RUN TestSomething
  --- PASS: TestSomething (0.50 seconds)
    my_test.go:32: after setup bag=&{Holding:0}
    my_test.go:35: {URL:http://127.0.0.1:59272 Listener:0xc20800ebd0 TLS:<nil> Config:0xc208004360 wg:{m:{state:0 sema:0} counter:0 waiters:0 sema:<nil>}}
    my_test.go:37: before assign bag=&{Holding:0}
    my_test.go:39: after assign bag=&{Holding:1}
    my_test.go:41: http://127.0.0.1:59272
  === RUN TestSomethingElse
  --- PASS: TestSomethingElse (1.01 seconds)
    my_test.go:48: after setup bag=&{Holding:0}
    my_test.go:51: {URL:http://127.0.0.1:59286 Listener:0xc20800ede0 TLS:<nil> Config:0xc208004420 wg:{m:{state:0 sema:0} counter:0 waiters:0 sema:<nil>}}
    my_test.go:53: before assign bag=&{Holding:0}
    my_test.go:55: after assign bag=&{Holding:5}
    my_test.go:57: http://127.0.0.1:59286
  PASS
  ok    command-line-arguments  2.523s