feat: wip unit tests

composer.json

@@ -7,6 +7,11 @@
             "PrestaShopCorp\\LightweightContainer\\": "src/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "PrestaShopCorp\\LightweightContainer\\Test\\": "tests/src/"
+        }
+    },
     "authors": [
         {
             "name": "hschoenenberger",
@@ -15,5 +20,14 @@
     ],
     "require": {
         "php": ">=5.6"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.0 || ^9.0",
+        "phpstan/phpstan": "^1.7",
+        "prestashop/php-dev-tools": "^4.2"
+    },
+    "scripts": {
+        "phpunit": "./vendor/bin/phpunit --coverage-text",
+        "php-cs-fixer": "./vendor/bin/php-cs-fixer fix --config .php_cs.dist.php --diff"
     }
 }

tests/phpstan.neon

@@ -0,0 +1,9 @@
+parameters:
+	paths:
+		- ../src
+	bootstrapFiles:
+		- ../vendor/autoload.php
+	checkMissingIterableValueType: false
+	reportUnmatchedIgnoredErrors: false
+
+	level: 6

tests/src/ServiceContainer/ServiceContainerTest.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace PrestaShopCorp\LightweightContainer\Test\ServiceContainer;
+
+use PHPUnit\Framework\TestCase;
+
+class ServiceContainerTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function itShouldTestSomething()
+    {
+        // TODO: implement tests
+    }
+}