Just a play projec to check context behaviour

context.go

package gocontext

import (
	"context"
	"log/slog"
	"sync"
	"testing"
	"time"
)

func TestContext(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())

	var wg sync.WaitGroup

	wg.Add(1)
	go func() {
		defer wg.Done()

		err := Foo(ctx)
		if err != nil {
			slog.Warn("error from Foo()", slog.String("error", err.Error()))
		}
	}()

	wg.Add(1)
	go func() {
		defer wg.Done()

		err := Bar(ctx)
		if err != nil {
			slog.Warn("error from Bar()", slog.String("error", err.Error()))
		}
	}()

	go func() {
		select {
		case <-ctx.Done():
			slog.Info("exiting test ...")
			return
		}
	}()

	wg.Wait()

	cancel()

	time.Sleep(5 * time.Second)
}

func Foo(ctx context.Context) error {
	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()

	tick := time.NewTicker(1 * time.Minute)
	defer tick.Stop()

	select {
	case <-ctx.Done():
		return ctx.Err()
	case <-tick.C:
		slog.Info("tick tock ...")
	}

	return nil
}

func Bar(ctx context.Context) error {
	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
	defer cancel()

	v := 0
	for {
		select {
		case <-ctx.Done():
			return ctx.Err()
		default:
			v += 1
			slog.Info("counter", slog.Int("value", v))
			time.Sleep(1 * time.Second)
		}
	}
}