Configuring Dash application testing with webdriver-manager by setting the local path for Chromedriver

I am currently exploring testing Dash applications using the method outlined in this guide:

However, I have encountered an issue with specifying the path of Chromedriver for the webdriver-manager used in dash testing.

Below is a snippet of what I attempted, which triggers the webdriver-manager before the actual test code:

def test_bsly001_falsy_child(dash_duo):
    
    app = import_app("my_app_path")
    dash_duo.start_server(app)

When executing this, webdriver-manager initiates the download of the latest Chrome version. Unfortunately, this poses a problem as company policy restricts internet downloads due to firewall restrictions. The mandated approach is to utilize the pre-downloaded Chromedriver available internally on the network.

I made an attempt at creating a pytest fixture to set up the Chrome driver prior to commencing testing:

driver = webdriver.Chrome(executable_path="...")

However, webdriver-manager does not seem to accept this alternative setup.

Is there any workaround you are aware of for this challenge? Any suggestions on how to proceed with Dash testing without relying on webdriver-manager?

Thank you.

pythonseleniumtestingpytestplotly-dash

Answer №1

Dealing with a similar issue led me to create a new pytest fixture called dash_duo_bis. This fixture utilizes a custom class DashComposite(Browser) located in the conftest.py file. In this class, the default behavior of the _get_chrome method is modified as shown below:

class DashComposite(Browser):

    def __init__(self, server, **kwargs):
        super().__init__(**kwargs)
        self.server = server

    def get_webdriver(self):
        return self._get_chrome()

    def _get_chrome(self):
        return webdriver.Chrome(executable_path = r"MY_CHROME_EXECUTABLE_PATH")

    def start_server(self, app, **kwargs):
        """Start the local server with app."""

        # Start server with app and provide Dash arguments
        self.server(app, **kwargs)

        # Set the default server_url and implicitly call wait_for_page
        self.server_url = self.server.url

Answer №2

I encountered a similar problem but managed to resolve it by adding Chromedriver to the PATH and executing tests. You can try the following steps:

export PATH=$PATH:<path to your chromedriver>
pytest <path to your directory where your test scripts are located>

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