curl -sS https://getcomposer.org/installer | php

php composer.phar install

Note: Call php composer.phar dumpautoload when new class is created.

$ ./vendor/bin/phpunit --verbose tests.

or specific test method can be run using --filteroption e.g. ./vendor/bin/phpunit --verbose tests --filter testFromHttpRequestCreatesCorrectRequest.

$ ./vendor/bin/phpcs --standard=PHPCompatibility --extensions=php --runtime-set testVersion 7.4- ./src

$ cd examples

$ php index.php

See https://getcomposer.org/doc/05-repositories.md#using-private-repositories how to reference this library in your project.