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Monkey patching in Ruby refers to dynamically modifying a class or module at runtime to add, remove or modify its behavior. In the context of Selenium, we can use monkey patching to modify the behavior of the driver to add new functionalities or override existing ones.

The following example shows how to monkey patch the Selenium driver in Ruby:

require 'selenium-webdriver'

# Create a new class or module to hold your custom methods
module MyDriverExtensions
  def custom_method(arg1, arg2)
    # Add your custom implementation
    puts "I am a custom method with arguments #{arg1} and #{arg2}"
  end
end

# Get the original Selenium driver class
original_driver_class = Selenium::WebDriver::Driver

# Define a new class that inherits from the original class 
# and includes your custom methods
class MyDriver < original_driver_class
  include MyDriverExtensions
end

# Replace the original driver class with your custom driver class
Selenium::WebDriver.const_set(:Driver, MyDriver)

# You can now create new instances of the driver with the added functionality:
driver = Selenium::WebDriver.for :chrome
driver.custom_method("hello", "world") # call your custom method

In this example, we are creating a new module MyDriverExtensions to hold our custom methods. Then, we create a new class MyDriver that inherits from the original driver class Selenium::WebDriver::Driver and includes our custom methods. Finally, we set the Driver constant in the Selenium::WebDriver module to point to our new MyDriver class.

Once the driver class has been replaced, you can create new instances of the driver with the added functionality by simply calling Selenium::WebDriver.for or any other method that creates a new instance of the driver.