Steps used for navigation on page:

`I visit the ":pageFileName" page`

Visits the url of the page object with :pageFileName name.

In order to make it work we create a page object file with a name of :pageFileName.

For example in case of: I visit the "myPage" page there should be a file myPage.js inside the pages directory.

If we have a page object with a name somePageObject.js defined inside pages directory then:

Given I visit the "somePageObject" page

will set this.currentPage variable to somePageObject page and we should end up on somePageObject url.

The same as I visit the ":pageFileName" page except allows to pass url parameters.

If url of myPage is defined as this.url = /orders/:orderId/products/:productId then we can use this step to visit this page by:

I visit the "myPage" page with parameters:
    | orderId   | 1 |
    | productId | 2 |

this will result in visiting the /orders/1/product/2 page.

Checks if current browser url matches url of pageFileName page object.

If the url matches expected pattern then this.currentPage variable is set to pageFileName page object.

Used to change content to a iframe selected by elementName.

To return to default content instead of elementName use string default