dist: trusty
language: php

install:
  - composer global require dealerdirect/phpcodesniffer-composer-installer;
  - composer global require phpcompatibility/php-compatibility;
  # Use PHPUnit 6 for unit tests (stable), requires PHP 7
  - if [[ $TRAVIS_PHP_VERSION == "7.0" ]]; then
      composer global require phpunit/phpunit ^6;
    fi
  # Use latest PHPUnit on nightly to detect breaking changes
  - if [[ $TRAVIS_PHP_VERSION == "nightly" ]]; then
      composer global require phpunit/phpunit;
    fi

script:
  - phpenv rehash
  # Run PHP_CodeSniffer on all versions
  - ~/.config/composer/vendor/bin/phpcs . --standard=phpcs.xml --warning-severity=0 --extensions=php -p;
  # Check PHP compatibility for the lowest supported version
  - if [[ $TRAVIS_PHP_VERSION == "5.6" ]]; then
      ~/.config/composer/vendor/bin/phpcs . --standard=phpcompatibility.xml --extensions=php -p;
    fi
  # Run unit tests (stable)
  - if [[ $TRAVIS_PHP_VERSION == "7.0" ]]; then
      phpunit --configuration=phpunit.xml --include-path=lib/;
    fi
  # Run unit tests (latest/nightly)
  # Check PHP compatibility for all versions, starting at the lowest supported version in order to detect breaking changes
  - if [[ $TRAVIS_PHP_VERSION == "nightly" ]]; then
      phpunit --configuration=phpunit.xml --include-path=lib/;
      ~/.config/composer/vendor/bin/phpcs . --standard=PHPCompatibility --extensions=php -p --runtime-set testVersion 5.6-;
    fi

matrix:
  fast_finish: true

  include:
    - php: 5.6
    - php: 7.0
    - php: nightly

  allow_failures:
    - php: nightly