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Playwright中Assertions斷言的方法實現(xiàn)

更新時間：2026年01月23日 10:26:44 作者：精靈靈怪

在編寫測試時,我們使用assert語句來斷言一段條件并以此為基礎(chǔ)條件,我們要么通過測試,要么不通過測試,Playwright給我們提供了另一個API,可以以一種更易讀的方式用來執(zhí)行相同的判斷

1. Page Assertions

from playwright.sync_api import Page, expect


DOCS_URL = "https://playwright.dev/python/docs/intro"


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    link = page.get_by_role("link", name="GET STARTED")
    link.click()

   # Page Assertions
    # assert page.url == DOCS_URL
    expect(page).to_have_url(DOCS_URL)
    expect(page).to_have_title("Installation | Playwright Python")

Run：

2. Element State Assertions

from playwright.sync_api import Page, expect


DOCS_URL = "https://playwright.dev/python/docs/intro"


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    link = page.get_by_role("link", name="GET STARTED")
    # Not exist in UI
    link_not = page.get_by_role("link", name="GET Python")

    expect(link).to_be_visible()
    expect(link).to_be_enabled()
    expect(link_not).not_to_be_visible()
    expect(link_not).to_be_hidden()
    link.click()

Run:

注意，link_not 在頁面上不存在，如果使用expect(link_not ).to_be_visible()，報錯如下：

3. Inner Text Assertions

3.1 Heading

from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    heading = page.locator("h1.hero__title")

    # Inner Text Assertions
    expect(heading).to_contain_text("testing")
    expect(heading).to_have_text(("Playwright enables reliable end-to-end testing for modern web apps."))

3.2 Dropdown list

from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    dropdown_menu = page.locator("ul.dropdown__menu")

    # Inner Text Assertions
    expect(dropdown_menu).to_contain_text("Python")
    expect(dropdown_menu).to_contain_text("Java")
    expect(dropdown_menu).to_contain_text("Node.js")
    expect(dropdown_menu).to_contain_text(".NET")

Run All：

4. Attribute Assertions

4.1 class

from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    docs_link = page.get_by_role("link", name="Docs")

    expect(docs_link).to_have_class("navbar__item navbar__link")

Run：

如果只想check或expect一個元素的一個class，則必須使用正則表達(dá)式。
如果還是使用上面的寫法，修改為expect(docs_link).to_have_class("navbar__link")
Run:

所以，正確的寫法如下：

import re
from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    docs_link = page.get_by_role("link", name="Docs")

    expect(docs_link).to_have_class(
        re.compile(r"navbar__link")
    )

現(xiàn)在可以在這個模式中使用所有的正則表達(dá)式語法。
假設(shè)這個類應(yīng)該從navbar __item開始，那我們的寫法應(yīng)為：re.compile(r"^navbar__item")

4.2 id

我們也可以expect元素ID：expect(docs_link).to_have_id("playwright")。

4.3 attribute

from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    docs_link = page.get_by_role("link", name="Docs")

    expect(docs_link).to_have_attribute(
        "href", "/python/docs/intro"
    )

5. Input Field Assertions

from playwright.sync_api import Page, expect


def test_get_started_link(page: Page):
    page.goto("https://playwright.dev/python")

    input = page.get_by_placeholder("Search docs")

    # input is hidden before button click
    expect(input).to_be_hidden()

    # Search button
    search_button = page.get_by_role("button", name="Search")
    search_button.click()

    # should pop the search menu
    expect(input).to_be_editable()
    expect(input).to_be_empty()

    # type some query in the input
    query = "assertions"
    input.fill(query)

    # check input value
    expect(input).to_have_value(query)

Run:

6. Checkbox Assertions

from playwright.sync_api import Page, expect


def test_app(page: Page):
    page.goto("https://bootswatch.com/default/")

    checked_checkbox = page.get_by_label("Checked checkbox")
    default_checkbox = page.get_by_label("Default checkbox")

    expect(checked_checkbox).to_be_checked()
    expect(default_checkbox).not_to_be_checked()

7. Option Assertions

from playwright.sync_api import Page, expect


def test_app(page: Page):
    page.goto("https://bootswatch.com/default/")

    option_menu = page.get_by_label("Example select")

    expect(option_menu).to_have_value("1")

    multi_option_menu = page.get_by_label("Example multiple select")

    multi_option_menu.select_option(["2", "4"])

    expect(multi_option_menu).to_have_values(["2", "4"])

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