[CI] Set up PHPUnit and first unit test

.gitignore

@@ -1,2 +1,4 @@
 .idea
 litebans-php.iml
+inc/test/vendor
+inc/test/composer.lock

.gitlab-ci.yml

@@ -1,10 +1,9 @@
-# This file is a template, and might need editing before it works on your project.
-# Select image from https://hub.docker.com/_/php/
 image: php:latest
 
 # Select what we should cache between builds
 cache:
   paths:
+    - inc/test/vendor/
     - vendor/
 
 before_script:
@@ -23,16 +22,18 @@ before_script:
   - pecl install xdebug
   - docker-php-ext-enable xdebug
   # Install and run Composer
-  #- curl -sS https://getcomposer.org/installer | php
-  #- php composer.phar install
+  - curl -sS https://getcomposer.org/installer | php
+  - php composer.phar install
+  - php composer.phar require --dev phpunit/phpunit ^9
 
 # Bring in any services we need http://docs.gitlab.com/ee/ci/docker/using_docker_images.html#what-is-a-service
 # See http://docs.gitlab.com/ce/ci/services/README.html for examples.
-services:
-  - mysql:5.7
+services: []
+#  - mysql:5.7
 
 # Set any variables we need
 variables:
+  COMPOSER: 'inc/test/composer.json'
   # Configure mysql environment variables (https://hub.docker.com/r/_/mysql/)
   MYSQL_DATABASE: mysql_database
   MYSQL_ROOT_PASSWORD: mysql_strong_password
@@ -41,4 +42,4 @@ variables:
 # If Xdebug was installed you can generate a coverage report and see code coverage metrics.
 test:
   script:
-    - vendor/bin/phpunit --configuration phpunit.xml --coverage-text --colors=never
+    - ./vendor/bin/phpunit inc/test/php

inc/test/composer.json

@@ -0,0 +1,10 @@
+{
+  "autoload": {
+    "classmap": [
+      "inc/"
+    ]
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9"
+  }
+}

inc/test/php/LangTest.php

@@ -0,0 +1,23 @@
+<?php declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+final class LangTest extends TestCase {
+    public function testLanguages(): void {
+        $langs = glob('./lang/*.php');
+        foreach ($langs as $lang) {
+            include_once $lang;
+            $lang_class = $lang;
+            $lang_class = substr($lang_class, 0, strpos($lang_class, ".")); // grab "lang/en_US" from "en_US.utf8.php"
+            $lang_class = substr($lang_class, strlen("lang/")); // grab "en_US" from "lang/en_US"
+
+            $instance = new $lang_class;
+            $this->assertTrue(is_array($instance->array));
+
+            $count = sizeof($instance->array);
+            $this->assertTrue($count > 0);
+
+            echo "Language $lang_class is valid. $count messages defined.";
+        }
+    }
+}