feat(tests): restructure test suite and add initial feature test

composer.json

@@ -7,6 +7,11 @@
             "App\\": "app/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Tests\\": "tests/"
+        }
+    },
     "authors": [
         {
             "name": "DAW Ies Montsià"
@@ -17,5 +22,16 @@
     },
     "require": {
         "php": "^8.2"
-    }
+    },
+    "config": {
+        "optimize-autoloader": true,
+        "preferred-install": "dist",
+        "sort-packages": true,
+        "allow-plugins": {
+            "pestphp/pest-plugin": true,
+            "php-http/discovery": true
+        }
+    },
+    "minimum-stability": "stable",
+    "prefer-stable": true
 }

phpunit.xml.dist

@@ -1,7 +1,24 @@
-<phpunit bootstrap="tests/bootstrap.php">
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+    bootstrap="vendor/autoload.php"
+    colors="true"
+>
     <testsuites>
-        <testsuite name="UrbanTree Test Suite">
-            <directory>tests</directory>
+        <testsuite name="Unit">
+            <directory>tests/Unit</directory>
+        </testsuite>
+        <testsuite name="Feature">
+            <directory>tests/Feature</directory>
         </testsuite>
     </testsuites>
+    <source>
+        <include>
+            <directory>app</directory>
+        </include>
+    </source>
+    <php>
+        <!-- <env name="DB_CONNECTION" value="sqlite"/> -->
+        <!-- <env name="DB_DATABASE" value=":memory:"/> -->
+    </php>
 </phpunit>

tests/Feature/ExampleTest.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+class ExampleTest extends TestCase
+{
+    /**
+     * A basic test example.
+     */
+    public function test_that_true_is_true(): void
+    {
+        $this->assertTrue(true);
+    }
+}

tests/TestCase.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Tests;
+
+// use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    //
+}

tests/DatabaseTest.php → tests/Unit/DatabaseTest.php

@@ -1,11 +1,14 @@
-<?php declare(strict_types=1);
+<?php
+
+namespace Tests\Unit;
 
 use App\Core\Database;
+use PDO;
 use PHPUnit\Framework\Attributes\RequiresPhpExtension;
 use PHPUnit\Framework\TestCase;
 
 #[RequiresPhpExtension('pdo_mysql')]
-final class DatabaseTest extends TestCase
+class DatabaseTest extends TestCase
 {
     protected function setUp(): void
     {