1 源码目录
selenium/webdriver/common/desired_capabilities.py
2 功能描述
根据测试代码中配置的DesiredCapabilities参数,来决定将测试代码分发到哪台node上进行测试;
补充知识:我们需要了解下selenium grid;
3 Selenium Grid介绍
3.1 是什么?
Selenium套件的一部分,它专门用于并行运行多个测试用例在不同的浏览器、操作系统和机器上;
Selenium Grid 主要使用 master-slaves (or hub-nodes) 理念 ,是一个 master/hub 和多个基于master/hub注册的子节点 slaves/nodes;
在master上基于不同的浏览器/系统运行测试用例时,master将会分发给适当的node运行;
3.2 什么时候用?
同时在不同的浏览器、操作系统和机器上运行测试;
用于兼容性测试;
减少运行时间。
3.3 怎么用?
启动Selenium Grid的三种方式,一种直接用命令行,另一种用JSON配置文件,最后一种docker启动。
3.3.1 命令行启动
简单说下步骤,详细的请查阅其他资料,运行hub机器为A,运行node机器为B。
配置Java环境;
浏览器;
浏览器对应的driver;
下载selenium server,将selenium-server-standalone-3.141.59.jar,机器A和机器B上;
机器A上打开命令行,进入selenium server目录下,运行:
ava -jar selenium-server-standalone-3.141.59.jar -role hub -port 5566
浏览器输入http://localhost:5566/grid/console ;
机器B上打开命令行,进入selenium server目录下,运行:
java -jar selenium-server-standalone-3.141.59.jar -role node -hub http://192.168.1.100:5566/grid/register/ -port 5577
刷新http://localhost:5566/grid/console ;
运行测试脚本,将会看到在机器B上打开了Chrome浏览器,并会运行测试用例。
3.3.2 Json配置文件启动
创建hub的Json配置文件;
{ "port": 4444, "newSessionWaitTimeout": -1, "servlets" : [], "withoutServlets": [], "custom": {}, "capabilityMatcher": "org.openqa.grid.internal.utils.DefaultCapabilityMatcher", "registry": "org.openqa.grid.internal.DefaultGridRegistry", "throwOnCapabilityNotPresent": true, "cleanUpCycle": 5000, "role": "hub", "debug": false, "browserTimeout": 0, "timeout": 1800}
以上代码保存为hub_config.json文件,放在 机器A上和selenium server相同的路径下;
创建nodes的 Json配置文件;
{ "capabilities": [ { "browserName": "firefox", "marionette": true, "maxInstances": 5, "seleniumProtocol": "WebDriver" }, { "browserName": "chrome", "maxInstances": 5, "seleniumProtocol": "WebDriver" }, { "browserName": "internet explorer", "platform": "WINDOWS", "maxInstances": 1, "seleniumProtocol": "WebDriver" }, { "browserName": "safari", "technologyPreview": false, "platform": "MAC", "maxInstances": 1, "seleniumProtocol": "WebDriver" } ], "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy", "maxSession": 5, "port": -1, "register": true, "registerCycle": 5000, "hub": "http://这里是机器A的ip:4444", "nodeStatusCheckTimeout": 5000, "nodePolling": 5000, "role": "node", "unregisterIfStillDownAfter": 60000, "downPollingLimit": 2, "debug": false, "servlets" : [], "withoutServlets": [], "custom": {}}
保存为node_config.json文件,放在机器B上和selenium server相同的路径下;
机器A,运行:
java -jar selenium-server-standalone-3.141.59.jar -role hub -hubConfig hub_config.json
机器B,运行:
java -jar selenium-server-standalone-3.141.59.jar -role node -nodeConfig node_config.json
3.3.3 docker启动
安装docker;
启动hub:
docker run -d -p 4444:4444 --name selenium-hub selenium/hub
启动node,比如chrome浏览器;
docker run -d --link selenium-hub:hub selenium/node-chrome
访问:http://localhost:4444/grid/console;
运行多个node:
docker run -d --link selenium-hub:hub selenium/node-chrome
关闭docker-grid的命令:
docker stop $(docker ps -a -q), docker rm $(docker ps -a -q)
注意,特别说明:关于Selenium Grid的内容参考与https://blog.csdn.net/lb245557472/article/details/91966770
4 部分源码说明
class DesiredCapabilities(object): """ Set of default supported desired capabilities. Use this as a starting point for creating a desired capabilities object for requesting remote webdrivers for connecting to selenium server or selenium grid. Usage Example:: from selenium import webdriver selenium_grid_url = "http://198.0.0.1:4444/wd/hub" # Create a desired capabilities object as a starting point. capabilities = DesiredCapabilities.FIREFOX.copy() capabilities['platform'] = "WINDOWS" capabilities['version'] = "10" # Instantiate an instance of Remote WebDriver with the desired capabilities. driver = webdriver.Remote(desired_capabilities=capabilities, command_executor=selenium_grid_url) Note: Always use '.copy()' on the DesiredCapabilities object to avoid the side effects of altering the Global class instance. """ FIREFOX = { "browserName": "firefox", "marionette": True, "acceptInsecureCerts": True, } INTERNETEXPLORER = { "browserName": "internet explorer", "version": "", "platform": "WINDOWS", } EDGE = { "browserName": "MicrosoftEdge", "version": "", "platform": "WINDOWS" }# 剩下的源码省略
从源码看,下边均对浏览器系统等的说明:
browserName:浏览器version:操作系统版本platform:操作系统
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