import pytest

from docslib import HeaderButton


def test_header_button_validation_and_factories():
    local = HeaderButton("Introduction", "1")
    assert local.page == "1"
    assert local.href is None

    external = HeaderButton.external("GitHub", "https://github.com/")
    assert external.href == "https://github.com/"
    assert external.new_tab is True

    with pytest.raises(ValueError, match="exactly one"):
        HeaderButton("Broken")

    with pytest.raises(ValueError, match="exactly one"):
        HeaderButton("Broken", page="1", href="https://example.com")