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55 lines
1.9 KiB
ReStructuredText
55 lines
1.9 KiB
ReStructuredText
Debugging
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=========
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.. py:currentmodule:: marionette
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Sometimes when working with Marionette you'll run into unexpected behaviour and
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need to do some debugging. This page outlines some of the Marionette methods
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that can be useful to you.
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Please note that the best tools for debugging are the `ones that ship with
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Gecko`_. This page doesn't describe how to use those with Marionette. Also see
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a related topic about `using the debugger with Marionette`_ on MDN.
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.. _ones that ship with Gecko: https://developer.mozilla.org/en-US/docs/Tools
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.. _using the debugger with Marionette: https://developer.mozilla.org/en-US/docs/Marionette/Debugging
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Storing Logs on the Server
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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By calling `~Marionette.log` it is possible to store a message on the server.
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Logs can later be retrieved using `~Marionette.get_logs`. For example::
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try:
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marionette.log("Sending a click event") # logged at INFO level
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elem.click()
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except:
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marionette.log("Something went wrong!", "ERROR")
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print(marionette.get_logs())
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Disclaimer: Example for illustrative purposes only, don't actually hide
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tracebacks like that!
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Seeing What's on the Page
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Sometimes it's difficult to tell what is actually on the page that is being
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manipulated. Either because it happens too fast, the window isn't big enough or
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you are manipulating a remote server! There are two methods that can help you
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out. The first is `~Marionette.screenshot`::
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marionette.screenshot() # takes screenshot of entire frame
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elem = marionette.find_element(By.ID, 'some-div')
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marionette.screenshot(elem) # takes a screenshot of only the given element
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Sometimes you just want to see the DOM layout. You can do this with the
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`~Marionette.page_source` property. Note that the page source depends on the
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context you are in::
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print(marionette.page_source)
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marionette.set_context('chrome')
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print(marionette.page_source)
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