.travis.yml

language: php
php:
 - 5.6
 - 7.0
 - 7.1
 - 7.2
 - 7.3
script:
 - make run-tests
after_success:
 - bash <(curl -s https://codecov.io/bash)
before_install:
 - sudo apt-get install -y libimage-exiftool-perl
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "5.6" ]]; then composer require --dev --no-update phpunit/phpunit ~5; fi
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.0" ]]; then composer require --dev --no-update phpunit/phpunit ~5; fi
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.1" ]]; then composer require --dev --no-update phpunit/phpunit ~7; fi
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.2" ]]; then composer require --dev --no-update phpunit/phpunit ~8; fi
 - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.3" ]]; then composer require --dev --no-update phpunit/phpunit 8.0.2; fi
install:
 - if [ $(echo "${TRAVIS_PHP_VERSION:0:3} <= 7.3" | bc -l) -eq 1 ]; then travis_retry composer install --no-interaction --ignore-platform-reqs && export PHPUNITCOMMAND=vendor/bin/phpunit; fi #PHPUNITCOMMAND is used in Makefile