3) What is synchronization issue? code example

Example: synchronization issue

Synchronization is very common issue in testing enviroment.
SYNCHRONIZATION means moving, working, acting together
so We want the webdriver and the browser to be synchronized.

First thing to handle synchronization issue is

THREAD.SLEEP
Coming from JAVA, not Selenium.
 - Stops the execution of the code with no conditions checked.
 - If we say wait for 10 seconds, it will stop the execution of the whole code
for 10 seconds.
 - It is not considered a good practice to use Thread.sleep.
 - i don't use it since help makes execution longer and heavier.

 OPTION #2: Implicit Wait
 - Implicit wait is coming from selenium.
 - The default value is 0 second
 - Every time findElement, findElements method
 is used, this implicitlyWait method is triggered.
 - We set this once, and it applies to every time
 we are trying to find element.

explicit wait=
  I use it when I want to wait for specific conditions or 
  specific web elements. 
    - Such as: elementIsClickable
    - elementIsDisplayed
    - titleIs...
       - To be able to use explicit wait:
       - You need to create instance of WebDriverWait class.