package httpdl

import (
	"errors"
	"net"
	"strings"
	"testing"
)

// retriesExhausted must wrap (not discard) the underlying cause, so main's
// exit-code mapping can still tell a DNS failure from a refused connection.
func TestRetriesExhausted(t *testing.T) {
	cause := &net.DNSError{Err: "no such host", Name: "x.invalid", IsNotFound: true}

	err := retriesExhausted("http://x", 5, cause)
	var de *net.DNSError
	if !errors.As(err, &de) {
		t.Fatalf("dropped the cause: %v", err)
	}
	if !strings.Contains(err.Error(), "after 5 tries") {
		t.Errorf("missing try count: %v", err)
	}

	// A single attempt did not "retry", so it must not claim it did.
	if one := retriesExhausted("segment 0", 1, cause); strings.Contains(one.Error(), "tries") {
		t.Errorf("single attempt should not mention tries: %v", one)
	}
}