Example of how go routines will continue even after a test fails.

example_test.go

package temp

import (
	"errors"
	"fmt"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
)

// This File is a simple demonstration of how goroutines will continue to run
// after a test finishes. This illustrates how in our other testing, nodes are
// continuing to run in the background if we are not closing them with a defer
// or t.Cleanup.

func TestHelloWorld(t *testing.T) {
	fmt.Println("Hello, World!")

	// this goroutine will continue to run after the test finishes
	go func() {
		c := time.After(time.Second * 5)
		for {
			select {
			case <-c:
				fmt.Println("go routine exit")
				return
			default:
			}
			fmt.Println("go routine")
			time.Sleep(time.Second)
		}
	}()

	t.Cleanup(func() {
		fmt.Println("Goodbye, World!")
	})

	fmt.Println("before check")
	require := require.New(t)
	require.NoError(errors.New("require error"))

	// This will not be printed because the test will exit before this line
	// is reached
	fmt.Println("after check")
}

// This test runs for 5 seconds, and then exits. The goroutine in the test above
// will continue to run for 5 seconds after this test exits.
func TestWait(t *testing.T) {
	time.Sleep(time.Second * 5)
}

If you download and run this file, you will is in the terminal the go routine printout continuing even after the first test fails.