Add pause on fail option to behat

Test Drop the attached 66675.feature into lib/tests/behat Initialise behat Run just that feature file Confirm that the first test was paused after a few steps Press [Enter/return] Confirm that the test continue running Confirm that the dots for the test continued on the line below the Enter message Confirm that the dots started straight after the previous set finished The test will continue running until... Confirm that the test failed Confirm that the reason for the failure was shown Confirm that you the test was not paused Edit your config.php and set: $CFG->behat_pause_on_fail = true; Run just that feature file again Confirm that the test paused in the same place as before Continue the test The test will continue running until... Confirm that the test failed Confirm that the reason for the failure was shown Confirm that the test paused at the failure point Press [Enter/return] Confirm that the rest of the steps were skipped running Confirm that the dots for the test continued on the line below the Enter message Confirm that the dots started straight after the previous set finished Example output Started at 19-09-2019, 07:37 ........ Paused. Press Enter/Return to continue. ............... Scenario failed. Paused for inspection. Press Enter/Return to continue. Exception follows: Link matching locator "Participants" not found. F---   --- Failed steps:   001 Scenario: A test fails automatically on a failure # /Users/nicols/Sites/moodles/sm/moodle/lib/tests/behat/66675.feature:38 When I follow "Participants" # /Users/nicols/Sites/moodles/sm/moodle/lib/tests/behat/66675.feature:42 Link matching locator "Participants" not found. (Behat\Mink\Exception\ElementNotFoundException)   2 scenarios (1 passed, 1 failed) 27 steps (23 passed, 1 failed, 3 skipped) 3m0.05s (52.70Mb)