Playwright中Assertions断言的方法实现_软件测试

在编写测试时，我们使用assert语句来断言一段条件并以此为基础条件，我们要么通过测试，要么不通过测试。playwright给我们提供了另一个api，可以以一种更易读的方式用来执行相同的判断。

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 在页面上不存在，如果使用expect(link_not ).to_be_visible()，报错如下：

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一个元素的一个class，则必须使用正则表达式。
如果还是使用上面的写法，修改为expect(docs_link).to_have_class("navbar__link")
run:

所以，正确的写法如下：

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")
    )

现在可以在这个模式中使用所有的正则表达式语法。
假设这个类应该从navbar __item开始，那我们的写法应为：re.compile(r"^navbar__item")

4.2 id

我们也可以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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