Combine the methods findElementBy(type,value) and element.click into one single method clickElementBy(type,value)

We can see the method findElementBy(type,value) is followed by element.click many times. And according to the meaning of finding and clicking, we can combine them together into clickElementBy(type,value).

And we will rewrite the methods in "buy_book.rb" as following:

def searchByKeyword (keyword)
    searchKeyword=findElementBy("id","twotabsearchtextbox")
    searchKeyword.clear
    searchKeyword.send_keys keyword
    clickElementBy("class", "nav-submit-input")
end

def openTheFirstItemInSearchResult
    clickElementBy("xpath", "//div[@id=\"result_0\"]//span[@class=\"lrg bold\"]")
end
def getCurrentItemTitle
    @bookTitle=findElementBy("id", "productTitle").text
end
def addToShoppingCart
    clickElementBy("name", "submit.add-to-cart")
end
def verifyItemAddedToShoppingCart
    confirm=findElementBy("id", "confirm-text")
    confirm.text.include?("1 item added to Cart")
end
def verifyItemAddedShownInShoppingCart
    book=findElementBy("xpath", "//div[@class=\"a-row a-size-base word-break\"]/a")
    book.attribute("title").should == @bookTitle
end
def clickElementBy (type, value)
    findElementBy(type, value).click
end