如何使用Selenium和Robot Framework在Chrome中添加和獲取Cookie值

最近我一直在用Selenium2Library學習Robot Framework，並且我遇到了一個小問題。如何使用Selenium和Robot Framework在Chrome中添加和獲取Cookie值

我嘗試將Cookie添加到在Chrome中打開的網站，然後檢索其值以確保其值等於預期值。

resources.txt：

*** Settings *** 
Library   Selenium2Library 
Library   OperatingSystem 

*** Variables *** 
${browser}  chrome

cookieKeywords：

*** Settings *** 
Resource   resources.txt 

*** Variables *** 
${CookieValue} ${EMPTY} 
${ExpectedCookieValue} somevalue 

*** Test Cases *** 
CookieTest 
    Open Browser http://www.google.pl ${browser} 
    Add Cookie CookieTest somevalue 
    ${CookieValue} Get Cookie Value CookieTest 
    Should Be Equal ${CookieValue} ${ExpectedCookieValue} "Cookie is equal" 
    Close Browser