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selenium源码通读·9 |DesiredCapabilities类分析
2022-07-06 06:07:00 【测试界的飘柔】
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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