package task

import (
	"context"
	"strings"
	"sync"
	"testing"
	"unicode/utf8"
)

func TestOutputIsBoundedConcurrentAndExecutionLocal(t *testing.T) {
	ctx, output := WithOutput(context.Background())
	other, separate := WithOutput(context.Background())
	Logf(other, "独立任务")
	var workers sync.WaitGroup
	for i := 0; i < 20; i++ {
		workers.Add(1)
		go func() {
			defer workers.Done()
			for j := 0; j < 100; j++ {
				Logf(ctx, "%s", strings.Repeat("渠道", 20))
				_ = output.String()
			}
		}()
	}
	workers.Wait()
	text := output.String()
	if !utf8.ValidString(text) || len(text) > 3100 || !strings.Contains(text, "已截断") {
		t.Fatalf("invalid bounded output: bytes=%d", len(text))
	}
	if separate.String() != "独立任务" {
		t.Fatal("execution details leaked between tasks")
	}
	Logf(context.Background(), "outside an execution")
}