Test Valet commands (#1256)

* First attempt at testing CLI commands

* Apply fixes from StyleCI

* Protect from running locally

* Fix test

* wip

* wip

* wip

* wip

* wip

* Update app.php

* Create config folder and files for CLI tests

* Apply fixes from StyleCI

* Fix some formatting

* Fix imports

* Update all output() calls to use the writer passed in by the command

Ugly capture of all $outputs from commands, by passing them into `writer()` to be bound into the container, where they can then be pulled out from calls to `output()` and its buddies `info()`, `table()`, and `warning()`.

* Apply fixes from StyleCI

* Flesh out park command test

* Apply fixes from StyleCI

* Drop php 7.0 and 7.1

Co-authored-by: StyleCI Bot <bot@styleci.io>
Co-authored-by: Matt Stauffer <matt@tighten.co>

tests/BaseApplicationTestCase.php

@@ -0,0 +1,35 @@
+<?php
+
+use Symfony\Component\Console\Tester\ApplicationTester;
+
+class BaseApplicationTestCase extends Yoast\PHPUnitPolyfills\TestCases\TestCase
+{
+    use UsesNullWriter;
+
+    public function setUp(): void
+    {
+        $this->prepTestConfig();
+        $this->setNullWriter();
+    }
+
+    public function prepTestConfig()
+    {
+        require_once __DIR__.'/../cli/includes/helpers.php';
+
+        if (Filesystem::isDir(VALET_HOME_PATH)) {
+            Filesystem::rmDirAndContents(VALET_HOME_PATH);
+        }
+
+        Configuration::createConfigurationDirectory();
+        Configuration::writeBaseConfiguration();
+    }
+
+    public function appAndTester()
+    {
+        $app = require __DIR__.'/../cli/app.php';
+        $app->setAutoExit(false);
+        $tester = new ApplicationTester($app);
+
+        return [$app, $tester];
+    }
+}