Passed

$ vendor/bin/behat --config /Users/stronk7/Sites/moodle_data_gitintegration/MOODLE_37_STABLE/postgres_behat/behatrun/behat/behat.yml --profile seleniumchrome mod/book/tests/behat/test.feature
Moodle 3.7.7+ (Build: 20200717), 6778871f8727d26ff4b1ceccacbdaabf170015fa
Php: 7.1.33, pgsql: 9.6.17, OS: Darwin 19.6.0 x86_64
Server OS "Darwin", Browser: "chrome"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 18-07-2020, 19:04
....................

10 escenarios (10 pasaron)
20 pasos (20 pasaron)
0m51.28s (48.78Mb)

Failed, provoking the problem:

$ vendor/bin/behat --config /Users/stronk7/Sites/moodle_data_gitintegration/MOODLE_37_STABLE/postgres_behat/behatrun/behat/behat.yml --profile seleniumchrome mod/book/tests/behat/test.feature
Moodle 3.7.7+ (Build: 20200717), 6778871f8727d26ff4b1ceccacbdaabf170015fa
Php: 7.1.33, pgsql: 9.6.17, OS: Darwin 19.6.0 x86_64
Server OS "Darwin", Browser: "chrome"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 18-07-2020, 19:07
......--------------

--- Hooks fallidos:

    BeforeStep # behat_hooks::before_step()
      Could not open connection: unknown error: Chrome failed to start: exited abnormally.
        (unknown error: DevToolsActivePort file doesn't exist)
        (The process started from chrome location /usr/bin/google-chrome is no longer running, so ChromeDriver is assuming that Chrome has crashed.)
        (Driver info: chromedriver=81.0.4044.138 (8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}),platform=Linux 4.19.76-linuxkit x86_64) (WARNING: The server did not provide any stacktrace information)
      Command duration or timeout: 58 milliseconds
      Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
      System info: host: 'ee8038118ee2', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.76-linuxkit', java.version: '1.8.0_252'
      Driver info: driver.version: unknown (Behat\Mink\Exception\DriverException)

    AfterScenario # behat_hooks::reset_webdriver_between_scenarios()
      Could not open connection: unknown error: Chrome failed to start: exited abnormally.
        (unknown error: DevToolsActivePort file doesn't exist)
        (The process started from chrome location /usr/bin/google-chrome is no longer running, so ChromeDriver is assuming that Chrome has crashed.)
        (Driver info: chromedriver=81.0.4044.138 (8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}),platform=Linux 4.19.76-linuxkit x86_64) (WARNING: The server did not provide any stacktrace information)
      Command duration or timeout: 53 milliseconds
      Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
      System info: host: 'ee8038118ee2', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.76-linuxkit', java.version: '1.8.0_252'
      Driver info: driver.version: unknown (Behat\Mink\Exception\DriverException)
...
...
10 escenarios (3 pasaron, 7 fallaron)
20 pasos (6 pasaron, 14 saltadas)
0m18.16s (49.03Mb)

Stacktrace when fails on 1st

$ vendor/bin/behat --config /Users/stronk7/Sites/moodle_data_gitintegration/MOODLE_37_STABLE/postgres_behat/behatrun/behat/behat.yml --profile seleniumchrome mod/book/tests/behat/test.feature
Moodle 3.7.7+ (Build: 20200717), 6778871f8727d26ff4b1ceccacbdaabf170015fa
Php: 7.1.33, pgsql: 9.6.17, OS: Darwin 19.6.0 x86_64
Server OS "Darwin", Browser: "chrome"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 18-07-2020, 19:07

The Selenium or WebDriver server is not running. You must start it to run tests that involve Javascript.
See https://docs.moodle.org/dev/Running_acceptance_test for more information.

The following debugging information is available:
. Could not open connection: unknown error: Chrome failed to start: exited abnormally.
  (unknown error: DevToolsActivePort file doesn't exist)
  (The process started from chrome location /usr/bin/google-chrome is no longer running, so ChromeDriver is assuming that Chrome has crashed.)
  (Driver info: chromedriver=81.0.4044.138 (8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}),platform=Linux 4.19.76-linuxkit x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 58 milliseconds
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: 'ee8038118ee2', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.76-linuxkit', java.version: '1.8.0_252'
Driver info: driver.version: unknown

* line 70 of /private/tmp/composerbase/integration/37/vendor/behat/mink/src/Session.php: call to Behat\Mink\Driver\Selenium2Driver->start()
* line 117 of /private/tmp/composerbase/integration/37/vendor/behat/mink/src/Mink.php: call to Behat\Mink\Session->start()
* line 108 of /private/tmp/composerbase/integration/37/vendor/behat/mink-extension/src/Behat/MinkExtension/Context/RawMinkContext.php: call to Behat\Mink\Mink->getSession()
* line 289 of /lib/tests/behat/behat_hooks.php: call to Behat\MinkExtension\Context\RawMinkContext->getSession()
* line 345 of /lib/tests/behat/behat_hooks.php: call to behat_hooks->restart_session()
* line ? of unknownfile: call to behat_hooks->before_first_scenario_start_session()
* line 109 of /private/tmp/composerbase/integration/37/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php: call to call_user_func_array()
...
...