这不一定是 rust 特有的问题，不过 cargo 测试太方便了，所以我很想继续用它……
我在把一个经过充分测试的桌面应用转成 WASM 应用。把 IO 移到调用链更上层之后，需要修改的代码很少，所以组成 WASM 应用的代码库仍然是经过充分测试的。
不过完整的“应用”还有其他部分，包括一些 html 和不少 JS。我想把这些全都测到，最好能覆盖多个浏览器，但不知道从哪里开始，尤其不知道怎么接到 cargo test 里。大概得先启动一个网页服务器……然后呢？需要填写 html 表单、点击提交按钮，之后可能还得批准下载，再检查下载内容是否正确。
有人能指点一下该从哪里找起吗。先谢谢了！
This isn't necessarily specific to rust, although cargo makes testing convenient enough that I'd quite like to stick with it...
I'm taking a thoroughly tested desktop application and turning it into a wasm application. Once IO was moved higher in the call chain, very little code needed changing, so the library containing the code that makes up the wasm application remains thoroughly tested as a result.
The complete "app", though, includes additional pieces, with some html and a fair amount of JS. I'd like tests covering all of that (ideally across multiple browsers), but don't know where to start (especially with hooking it into cargo test). Presumably a web server has to be started... what comes next? A html form needs input, its submit button needs clicking, and a resulting download probably needs approving before its contents can be verified.
Could somebody suggest where I should start looking. Thanks beforehand!
WASM 的行为取决于浏览器。同一个测试可能在 Chrome 通过，在 Firefox 失败。因此要启动你打算测试的浏览器，通常使用专门用于测试的无界面版本。
UI 测试框架可以通过程序执行点击、移动鼠标、输入文字等操作。然后检查结果值，或者截图并逐个像素比较。
How wasm behaves depends on the browser. A test passing on Chrome might fail on Firefox. You'll therefore have to launch whichever browser you want to test (generally a headless version intended for this).
UI test frameworks let you program actions like clicking, moving the mouse, or typing. Afterwards, check the resulting values or capture an image and compare individual pixels.
谢谢，你的建议让我找到了 playwright-rs(https://playwright-rust.dev/v0.20.0/)，看起来很有希望。还需要一个网页服务器，不过我想 python 自带的简单服务器应该就够了。
Thanks, your suggestion led me to playwright-rs (https://playwright-rust.dev/v0.20.0/), which seems quite promising. A webserver is still needed, though I imagine python's simple server would do.
我在测试时会为每个测试单独启动网页服务器，做法类似 ureq 讨论 #1178 里的测试服务器示例(https://github.com/algesten/ureq/discussions/1178)，效果不错。也很可能已经有人把相似功能做成了 crate。
In my tests I start a separate webserver for each test, along these lines -> Sample server for tests in ureq discussion #1178 (https://github.com/algesten/ureq/discussions/1178), which has worked well. It also seems likely somebody has put similar functionality into a crate.
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