package resource

import (
	"fmt"
	"testing"
	"time"
)

func TestRetry(t *testing.T) {
	t.Parallel()

	tries := 0
	f := func() error {
		tries++
		if tries == 1 {
			return nil
		}

		return fmt.Errorf("error")
	}

	err := Retry(2*time.Second, f)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
}

func TestRetry_timeout(t *testing.T) {
	t.Parallel()

	f := func() error {
		return fmt.Errorf("always")
	}

	err := Retry(1*time.Second, f)
	if err == nil {
		t.Fatal("should error")
	}
}

func TestRetry_error(t *testing.T) {
	t.Parallel()

	expected := fmt.Errorf("nope")
	f := func() error {
		return RetryError{expected}
	}

	errCh := make(chan error)
	go func() {
		errCh <- Retry(1*time.Second, f)
	}()

	select {
	case err := <-errCh:
		if err != expected {
			t.Fatalf("bad: %#v", err)
		}
	case <-time.After(5 * time.Second):
		t.Fatal("timeout")
	}
}