Allow to install Fastest in global mode

[francoispluchino]

Q	A
Branch?	master
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	~
License	MIT
Doc PR	~

The Symfony's team strongly recommend in Symfony 4 Flex should not add in the Phpunit dependencies in our projects, even in dev. So, it is recommended to install Phpunit globally. However, Fastest is not able to work in global mode.

This PR allow to install/use the Fastest in global mode with Phpunit.

[DonCallisto]

That's a good improvement but what if someone has installed phpunit globally not through composer?

Something like

$ wget https://phar.phpunit.de/phpunit-x.y.phar
$ chmod +x phpunit-x.y.phar
$ sudo mv phpunit-x.y.phar /usr/local/bin/phpunit

[francoispluchino]

Maybe in this case, use or add an environment variable to define the binary to use?

[francoispluchino]

Sorry, use directly the phpunit bin.

[DonCallisto]

It make sense. Could you please provide a working solution here?

[francoispluchino]

Yes, of course.

[francoispluchino]

It's done.

[DonCallisto]

Could you adopt an "early exit" here to compact the code?
Something like

if (null !== self::$cacheBinCmd) {
  return self::$cacheBinCmd
}

[DonCallisto]

Can you extract this and the else in more semantic methods? Something like isRunningOnWindows, setWindowsBinCmd and isRunningOnUnix, setUnixBinCmd or whatever you like but more communicative.

Thank you.

[francoispluchino]

The requested changes are made.

[DonCallisto]

Last one thing, could you document this behavior?

[francoispluchino]

It's done. I don't really know what to add!

[DonCallisto]

LGTM, thanks a lot again

[francoispluchino]

Thank you for your speed. When do you expect to create a stable release like 1.5.2?

[DonCallisto]

Not 1.6? However as soon as I can integrate #116 (I'll ask for your review)

[francoispluchino]

Personally, I will upgrade to version 1.6.0 because there is a new feature.

In this case, update the composer branch alias in composer.json file.

[DonCallisto]

I've already done in #116 last win commit, take a look