Add PHP 7.4 to Travis CI

[sanmai]

• Add a testing stage for PHP 7.4 + xdebug
• Require build passing for 7.4

This PR:

• Hopefully does something about Fix build for PHP 7.4 before November, 28 #774

[sanmai]

There's a hiccup with Codeception something, @maks-rafalko can you have a look?

[maks-rafalko]

requires ext-zip * -> the requested PHP extension zip is missing from your system.

strange.. Ok, I will have a look but in the evening. Seem like ext-zip is not installed for PHP 7.4 ....

[sanmai]

It seems like there's a reason to it. Shall we skip this test under PHP 7.4 for time being?

[maks-rafalko]

Many people from major repositories are experiencing the very same issue, as well as issues with other extensions:

• https://travis-ci.community/t/some-extensions-are-missing-in-php-7-4-0-zip-gmp-sodium/6320/12
• https://travis-ci.community/t/php-7-4-release/6197/10

So yeah, probably we just need to skip it for now and move forward.

[maks-rafalko]

Now Unit Tests work without errors for PHP 7.4 with XDebug.

There is an issue with Box: @theofidry you might be interested in this

The configuration file failed validation: include(): _HumbugBox3ab8cff0fda0\Opis\Closure\ClosureStream::stream_set_option is not implemented!

[theofidry]

Box is not compatible with 7.4 yet: humbug/php-scoper#357

[sanmai]

leanphp/phpspec-code-coverage isn't formally compatible with PhpSpec 6 which is required for PHP 7.4. What do we do?

TBH this package looks pretty much abandoned. Not a single update since 2018. Yet there's hope.

[theofidry]

@sanmai hopefully we'll have an alternative to the XML coverage report as a tracer this year, at the very least for PhpSpec, so this package will no longer be necessary!

[maks-rafalko]

Also, I'm working on extracting PHPSpec to a separate package, so infection/infection won't have this failing e2e test here anymore. Let's wait when it's done (and keep an eye on leanphp/phpspec-code-coverage#40)

[sanmai]

Since there's work ongoing with PHPSpec, may I propose we merge this subset of changes?

Builds are failing due to unrelated issues. This PR changes nothing in terms of actual functionality, so it shouldn't introduce any new faults.

[maks-rafalko]

I'm 👌 with merging, but seems like the latest commit introduces a new issue:

https://travis-ci.org/infection/infection/jobs/649865760#L376-L380

[sanmai]

It isn't getting better. Can we fix this in another PR, what do you think?
https://travis-ci.org/infection/infection/jobs/649890785#L378-L387

[sanmai]

Alright fingers crossed it should be fixed.

[maks-rafalko]

thank you @sanmai

[sanmai]

Thank you @maks-rafalko