前言
playwright 提供了一个 expect方法 用于断言，还可以设置超时时间。
expect 使用
| 断言 | 描述 |
|---|---|
| expect(locator).to_be_checked() | Checkbox is checked |
| expect(locator).to_be_disabled() | Element is disabled |
| expect(locator).to_be_editable() | Element is enabled |
| expect(locator).to_be_empty() | Container is empty |
| expect(locator).to_be_enabled() | Element is enabled |
| expect(locator).to_be_focused() | Element is focused |
| expect(locator).to_be_hidden() | Element is not visible |
| expect(locator).to_be_visible() | Element is visible |
| expect(locator).to_contain_text() | Element contains text |
| expect(locator).to_have_attribute() | Element has a DOM attribute |
| expect(locator).to_have_class() | Element has a class property |
| expect(locator).to_have_count() | List has exact number of children |
| expect(locator).to_have_css() | Element has CSS property |
| expect(locator).to_have_id() | Element has an ID |
| expect(locator).to_have_js_property() | Element has a JavaScript property |
| expect(locator).to_have_text() | Element matches text |
| expect(locator).to_have_value() | Input has a value |
| expect(locator).to_have_values() | Select has options selected |
| expect(page).to_have_title() | Page has a title |
| expect(page).to_have_url() | Page has a URL |
| expect(api_response).to_be_ok() | Response has an OK status |
to_be_checked()使用示例
from playwright.sync_api import expect
locator = page.get_by_label("Subscribe to newsletter")
expect(locator).to_be_checked()
to_be_visible()使用示例
# 上海悠悠 wx:283340479
# blog:https://www.cnblogs.com/yoyoketang/
from playwright.sync_api import expect
locator = page.locator('.my-element')
expect(locator).to_be_visible()
设置超时
如下图中的提示语，点击按钮后，可能在1秒内就会出现提示框。
默认情况下，断言超时时间是5秒钟, 你也可以自定义超时时间.
from playwright.sync_api import expect
# 上海悠悠 wx:283340479
# blog:https://www.cnblogs.com/yoyoketang/
def test_foobar(page: Page) -> None:
# ......
expect(page.get_by_text("操作成功")).to_be_visible(timeout=3000)
在conftest.py 中设置全局 expect 超时
from playwright.sync_api import expect
expect.set_options(timeout=8000)
自定义异常消息
expect 中添加第二个参数，设置自定义报错消息内容
expect(page.get_by_text("Name"), "should be logged in").to_be_visible()
断言报错后显示
def test_foobar(page: Page) -> None:
> expect(page.get_by_text("Name"), "should be logged in").to_be_visible()
E AssertionError: should be logged in
E Actual value: None
E Call log:
E LocatorAssertions.to_be_visible with timeout 5000ms
E waiting for get_by_text("Name")
E waiting for get_by_text("Name")
tests/test_foobar.py:22: AssertionError
文章转自：https://www.cnblogs.com/yoyoketang/p/17642111.html
