WebDriverTests/imported/w3c/webdriver/tests/take_element_screenshot/screenshot.py

from tests.support.asserts import assert_error, assert_png, assert_success
from tests.support.image import png_dimensions
from tests.support.inline import inline

from . import element_rect


def take_element_screenshot(session, element_id):
    return session.transport.send(
        "GET",
        "session/{session_id}/element/{element_id}/screenshot".format(
            session_id=session.session_id,
            element_id=element_id,
        )
    )


def test_no_browsing_context(session, closed_window):
    response = take_element_screenshot(session, "foo")
    assert_error(response, "no such window")


def test_stale(session):
    session.url = inline("<input>")
    element = session.find.css("input", all=False)
    session.refresh()

    result = take_element_screenshot(session, element.id)
    assert_error(result, "stale element reference")


def test_format_and_dimensions(session):
    session.url = inline("<input>")
    element = session.find.css("input", all=False)
    rect = element_rect(session, element)

    response = take_element_screenshot(session, element.id)
    value = assert_success(response)

    assert_png(value)
    assert png_dimensions(value) == (rect["width"], rect["height"])