Run a D8 test from a clean install

gistfile1.sh

# Obviously, replace the site location and DB credentials with yours.

# Resets a Drupal installation (destroying all data) without reinstalling.
# Run this command directly to clean up the old installation before
# reinstalling manually.
function drupal-reset() {
  # Remove existing database.
  drush sql-drop -y;
  # Remove existing installation.
  sudo rm -rf sites/default;
  # Restore the sites/default/default.settings.php file.
  sudo git checkout -- sites/default;
  # Temporarily make the sites/default writable by anyone.
  sudo chmod -R 777 sites/default;
  # Ensure the owner is the current user, not the root user.
  sudo chown -R `whoami` sites/default;
  # Now that it is writeable, restore the directory from the branch.
  sudo git checkout -- sites/default;
  # Ensure that we still own the folder.
  sudo chown -R `whoami` sites/default;
}

# Reinstalls Drupal 8 with a particular install profile, destroying all data.
# Usage: drupal-install 'minimal'
# By default, the 'standard' profile is used.
function drupal-install() {
  drupal-reset

  # Accept an install profile as an argument.
  if [ $1 ] ; then
    drush si $1 --db-url=mysql://root:root@localhost/d8 -y
  else
    drush si --db-url=mysql://root:root@localhost/d8 -y
  fi
}

# Reinstalls Drupal 8 with the testing profile and runs a given test.
# Usage: reinstall-test 'Drupal\Tests\Core\UrlTest
function reinstall-test() {
  if [ $1 ] ; then
    # Install the testing profile.
    drupal-install 'testing'
    # Enable the simpletest module.
    drush en simpletest -y
    # Run the given test class, with detailed results.
    php ~/d8git/core/scripts/run-tests.sh --color --url http://localhost:8888/d8git/ --verbose --class $1
  else
    echo "You must specify a test class. Usage: reinstall-test 'Drupal\Tests\Core\UrlTest'"
  fi
}