Make Guzzle request options configurable

[claudiu-cristea]

Problem

Behat tests are failing for logged in users when the site is accessed via HTTPS and SSL peer verification is failing. But with BrowserTestBase we're able to run such tests. Testing should not require a valid SSL certificate

Proposal

Make Guzzle request options configurable

Example:

default:
  suites:
    default:
      contexts:
        - FeatureContext
        - Drupal\DrupalExtension\Context\DrupalContext
        - Drupal\DrupalExtension\Context\MinkContext
  extensions:
    Drupal\MinkExtension:
      base_url: https://localhost
      browserkit_http:
        guzzle_request_options:
          verify: false

In this example, browserkit_http.guzzle_request_options is configured to instantiate the Guzzle underlying HTTP client with the verify request option set to false, same as BrowserTestBase:: initMink() is doing

[claudiu-cristea]

We have now the proof, see the test failures

[Berdir]

this should probably say *with self-signed certificate in the title, because that's the only issue here afaik, would need a setting to allow those I guess.

Also has nothing to with this project, if not already supported it's something that the driver needs to support? I know some chrome drivers have this

[claudiu-cristea]

@Berdir, now we're using DrupalTestBrowser (core) as client which uses Guzzle as HTTP client. When DrupalTestBrowser is used in BrowserTestBase, Guzzle is instantiated with verify: false config. We need the same here

EDIT: Relevant code: \Drupal\Tests\BrowserTestBase::initMink()

[claudiu-cristea]

Yes, maybe we should do the Guzzle request options configurable

[claudiu-cristea]

Ready for review

[jhedstrom]

This looks great. Thanks!