感谢

文章的主要思路来自于 seveniruby 的Appium 微信 webview 的自动化技术，非常感谢~~

打开调试功能

通过微信打开 debugx5.qq.com，或者直接扫下面二维码

勾选【打开 TBS 内核 Inspector 调试功能】

Chrome 查看页面元素

手机连接电脑，查看是否连接成功。如下展示设备号则为连接成功

进入任意小程序，以【X 东】为例，在 Chrome 浏览器访问 chrome://inspect/#devices

点击 inspact，即可查看页面元素

小程序的进程

微信有很多的进程，每一个小程序都运行在不同的进程中。
进入【X 东】后，看下当前运行在哪个进程中

我们可以看到，当前的小程序运行在 com.tencent.mm:appbrand0 中，记住这个进程，记住啦

Appium 编写测试用例

最关键的一点，需要添加 androidProcess 这一项，也就是我们上面的 com.tencent.mm:appbrand0
我用 python 写一个简单的 demo

desired_caps = {
            'platformName': 'Android',
            'fastReset': 'false',
            'deviceName': 'XXXXXX',
            'appPackage': 'com.tencent.mm',
            'appActivity': '.ui.LauncherUI',
            'fullReset': 'false',
            'unicodeKeyboard': 'True',
            'resetKeyboard': 'True',
            'chromeOptions': {
                'androidProcess': 'com.tencent.mm:appbrand0'
                }
            }
driver = webdriver.Remote('http://localhost:4723/wd/hub', desired_caps)
driver.find_element_by_name("发现").click()
driver.find_element_by_name("小程序").click()
driver.find_element_by_name("X东购物").click()
driver.switch_to.context('WEBVIEW_com.tencent.mm:appbrand0')
time.sleep(5)
print(driver.page_source)

切换 Webview 失败

我遇到过一种切换 Webview 失败的情况，下面贴上 appium 的报错日志。

> info: Chromedriver: Changed state to 'stopped'
> error: Chromedriver: Chromedriver exited unexpectedly with code null, signal SIGTERM
> warn: Chromedriver for context WEBVIEW_com.tencent.mm:appbrand1 stopped unexpectedly
> warn: Chromedriver quit unexpectedly, but it wasn't the active context, ignoring
> error: Chromedriver: Error: A new session could not be created. (Original error: session not created exception
> from unknown error: Runtime.executionContextCreated has invalid 'context': {"auxData":{"frameId":"32496.2","isDefault":true},"id":2,"name":"","origin":"https://servicewechat.com"}
>   (Session info: chrome=57.0.2987.132)
>   (Driver info: chromedriver=2.18.343845 (73dd713ba7fbfb73cbb514e62641d8c96a94682a),platform=Windows NT 6.1 SP1 x86_64))
>     at JWProxy.command$ (lib/proxy.js:133:15)
>     at tryCatch (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\regenerator\runtime.js:67:40)
>     at GeneratorFunctionPrototype.invoke [as _invoke] (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\regenerator\runtime.js:315:22)
>     at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\regenerator\runtime.js:100:21)
>     at GeneratorFunctionPrototype.invoke (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\regenerator\runtime.js:136:37)
>     at bound (domain.js:284:14)
>     at GeneratorFunctionPrototype.runBound (domain.js:297:12)
>     at run (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\node_modules\core-js\library\modules\es6.promise.js:89:39)
>     at D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\node_modules\core-js\library\modules\es6.promise.js:100:28
>     at flush (D:\Appium\node_modules\appium\node_modules\appium-chromedriver\node_modules\appium-jsonwp-proxy\node_modules\babel-runtime\node_modules\core-js\library\modules\$.microtask.js:17:13)
>     at process._tickDomainCallback (node.js:381:11)
>  { [Error: A new session could not be created. (Original error: session not created exception
> from unknown error: Runtime.executionContextCreated has invalid 'context': {"auxData":{"frameId":"32496.2","isDefault":true},"id":2,"name":"","origin":"https://servicewechat.com"}
>   (Session info: chrome=57.0.2987.132)
>   (Driver info: chromedriver=2.18.343845 (73dd713ba7fbfb73cbb514e62641d8c96a94682a),platform=Windows NT 6.1 SP1 x86_64))]
>   status: 33,
>   value: { message: 'session not created exception\nfrom unknown error: Runtime.executionContextCreated has invalid \'context\': {"auxData":{"frameId":"32496.2","isDefault":true},"id":2,"name":"","origin":"https://servicewechat.com"}\n  (Session info: chrome=57.0.2987.132)\n  (Driver info: chromedriver=2.18.343845 (73dd713ba7fbfb73cbb514e62641d8c96a94682a),platform=Windows NT 6.1 SP1 x86_64)' },

注意最后那一段的 chrome 和 chromedriver 的版本

查看对应表可知，两者版本不对应，需要替换 chromedriver

将 Appium 的 chromedriver 替换为相应版本后，即可成功切换。