PHPUnit

In php world, the standard de facto framework to make unit tests is PHPUnit. PHPUnit is downloadable as phar archive or via composer. We'll show both manners. There are other frameworks. This is just

Install PHPUnit's phar

PHPUnit distribute a PHP Archive (phar). This archive contains everything a PHP Developer needs in order to use PHPUnit. Phar archive can be downloaded using wget command. First command download the phat. Second command make it executable and runnable as command like ./phpunit.phar instead of php ./phpunit.phar. Third command make it a system command. This means that phpunit is runnable from everywhere in this machine.

wget -O phpunit https://phar.phpunit.de/phpunit-7.phar
chmod +x phpunit
mv phpunit.phar /usr/local/bin/phpunit

Install with Composer

Install phpunit with composer is very very simple. The following example is a phpunit installation inside a symfony4 project. Notice that in symfony4 uses flex to install libraries.

composer require phpunit

Run phpunit

Depending on your composer.json configuration, it is possibile to run phpunit with

php vendor/bin/phpunit

I suggest a little improvement in composer configuration. This little improvement keep all binaries in bin folder. There is a command that make it simple:

composer config bin-dir bin

From now you can run phpunit with shorten command.

./bin/phpunit

This is expected output after running the command

As you can see there are no tests here and "No tests executed!" appears.