tests(travis): Enable vendor folder caching and composer update

language: php

sudo: false

# Cache composer downloads to speed up the composer install step.

# Cache composer vendor directories to speed up the composer install step.

cache:

  directories:

    - $HOME/.composer/cache

    - vendor

    - composer.lock

matrix:

  fast_finish: true

  - phpenv config-rm xdebug.ini || echo 'No xdebug config.'

before_script:

  # We don't have a composer.lock file because we always want to test with

  # latest dependencies.

  # Run install in case the cached vendor directory is not present.

  - composer install

  # Always run tests with up to date dependencies.

  - composer update

script:

  - ./vendor/bin/phpunit