Make sure it isn’t interpreted as a type NULL, making the test fail with
PHPUnit 7.2.

…ed functions

* 2.8:
  Fix Clidumper tests
  Enable the fixer enforcing fully-qualified calls for compiler-optimized functions
  Apply fixers
  Disable the native_constant_invocation fixer until it can be scoped
  Update the list of excluded files for the CS fixer

* 3.4:
  Fix Clidumper tests
  Enable the fixer enforcing fully-qualified calls for compiler-optimized functions
  Apply fixers
  Disable the native_constant_invocation fixer until it can be scoped
  Update the list of excluded files for the CS fixer

* 4.0:
  Fix Clidumper tests
  Enable the fixer enforcing fully-qualified calls for compiler-optimized functions
  Apply fixers
  Disable the native_constant_invocation fixer until it can be scoped
  Update the list of excluded files for the CS fixer

* 2.8:
  Alpha-ordering for "use" statements

* 3.4:
  Alpha-ordering for "use" statements

* 4.0:
  Alpha-ordering for "use" statements

…evot)

This PR was merged into the 3.4 branch.

Discussion
----------

Use an empty string as default for assertEquals

Make sure it isn’t interpreted as a type NULL, making the test fail with PHPUnit 7.2.

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

This shouldn’t break the existing tests, but will also make them work with recent PHPUnit.

Commits
-------

31353147a3 Use an empty string as default for assertEquals

* 3.4:
  Fix tests for legacy phpunit versions
  Add missing Ukrainian translations
  Use an empty string as default for assertEquals

* 4.0:
  Fix tests for legacy phpunit versions
  Add missing Ukrainian translations
  Use an empty string as default for assertEquals

* 2.8:
  Enable native_constant_invocation CS fixer

* 3.4:
  Enable native_constant_invocation CS fixer

* 4.0:
  Enable native_constant_invocation CS fixer