Update test suite to phpunit 9.5 syntax
Refactored to use polyfill for older PHP versions via `yoast/phpunit-polyfills`
Note: this includes 2 important differences from usual phpunit test suites:
- instead of extending `PHPUnit\Framework\TestCase` we extend `Yoast\PHPUnitPolyfills\TestCases\TestCase`
- instead of handling fixtures via `setUp()` and `tearDown()` we use `set_up()` and `tear_down()` respectively
Comment regarding formatting: I chose to use the FQDN in the `extends` syntax of the class declaration instead of using `use` so that it is more quickly apparent that we're doing something slightly different than usual phpunit syntax, particularly in regards to the set_up() / tear_down() methods that appear immediately following the `extends` line.
Last year's Homebrew's PHP packaging changes altered their version numbering strategy.
Now that their changes appear to have stabilized, Valet also needs some updates to match.
The `linkedPhp()` function was parsing the symlinked directory name for where the php binaries are stored, but that numbering strategy has morphed over time.
This PR changes the logic to accommodate the most common directory naming strategies I can find, including those of older installs.
I've included some examples of these names in code comments for future reference since finding a variety of them can be complicated.
* Allows for valet to run under PHP 5.5 as well.
Add checks for php55 to the mix.
* Allows for valet to run under PHP 5.5 as well.
Add checks for php55 to the mix.
* Update .travis.yml
* Update PhpFpm.php
* Add tests for php55
