Fixed tests for Symfony 3.0 compatibility

[deguif]

I deliberately chose to use full namespaced class name for Scope and RequestStack as depending on which Symfony version the tests are run , they could not exist.

• RequestStack was introduced on Symfony 2.4
• Scope was removed on Symfony 3.0

[deguif]

Tests are still failing on PHP 5.3 but that's related to memory used by composer.

[acrobat]

HHVM test failure can be fixed by setting the dist option in the build matrix in the .travis.yml

matrix:
    include:
        - php: hhvm
          dist: trusty

[acrobat]

~I would even suggest adding php 5.3 to the allowed failures and move the minimum php version up to 5.6~

@deguif I think you can simply fix the php 5.3 build by commiting the composer.lock, because it is missing. So the composer install in the travis build will effectively be a composer update. Thus requiring more memory

[deguif]

I just updated .travis.yml to configure php memory_limit, this should fix PHP 5.3failure.

[deguif]

I can confirm now that PHP 5.3 tests are now succeeding. Just HHVM tests are still failing.

[deguif]

Thanks @acrobat , I updated the config for HHVM tests on .travis.yml

[deguif]

HHVM tests suite has launched after composer install, that's better than before, but there are still some weird errors.

[deguif]

When downgrading HHVM to 3.6, all tests are green. It seems like latest LTS HHVM 3.18 version is not able to make test pass.

I found this issue on HHVM that was reported by @nicolas-grekas https://github.com/facebook/hhvm/issues/7722

This should be fixed with the new 3.20.2 HHVM version. For the moment, I used version 3.15 of HHVM

[acrobat]

I would even say to remove support for HHVM as symfony did also drop support for it. So we could keep testing on HHVM but move it to the allow failures

[acasademont]

Hi @deguif and @acrobat thanks a lot for this, I found some time today to review all these patches.