package html_test

import (
	"errors"
	"testing"

	html "dappco.re/go/core/html"
)

func TestValidateLayoutVariant_ExportsPositions(t *testing.T) {
	err := html.ValidateLayoutVariant("H1X?")
	if err == nil {
		t.Fatal("ValidateLayoutVariant returned nil, want error")
	}

	var variantErr *html.LayoutVariantError
	if !errors.As(err, &variantErr) {
		t.Fatalf("errors.As(%T) failed, want *html.LayoutVariantError", err)
	}

	if got := string(variantErr.InvalidSlots()); got != "1X?" {
		t.Fatalf("InvalidSlots() = %q, want %q", got, "1X?")
	}

	if got := variantErr.InvalidPositions(); len(got) != 3 || got[0] != 2 || got[1] != 3 || got[2] != 4 {
		t.Fatalf("InvalidPositions() = %v, want %v", got, []int{2, 3, 4})
	}
}