[Tests] Add test for package discovery configuration

Author: lindyhopchris

composer.json

@@ -56,13 +56,13 @@
             "dev-develop": "1.x-dev"
         },
         "laravel": {
-            "providers": [
-                "LaravelJsonApi\\Laravel\\ServiceProvider"
-            ],
             "aliases": {
                 "JsonApi": "LaravelJsonApi\\Core\\Facades\\JsonApi",
                 "JsonApiRoute": "LaravelJsonApi\\Laravel\\Facades\\JsonApiRoute"
-            }
+            },
+            "providers": [
+                "LaravelJsonApi\\Laravel\\ServiceProvider"
+            ]
         }
     },
     "minimum-stability": "stable",

tests/lib/Unit/PackageTest.php

@@ -0,0 +1,45 @@
+<?php
+/*
+ * Copyright 2021 Cloud Creativity Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+declare(strict_types=1);
+
+namespace LaravelJsonApi\Laravel\Tests\Unit;
+
+use LaravelJsonApi\Core\Facades\JsonApi;
+use LaravelJsonApi\Laravel\Facades\JsonApiRoute;
+use LaravelJsonApi\Laravel\ServiceProvider;
+use PHPUnit\Framework\TestCase;
+
+class PackageTest extends TestCase
+{
+
+    public function test(): void
+    {
+        $json = json_decode(file_get_contents(__DIR__ . '/../../../composer.json'), true);
+
+        $this->assertArrayHasKey('laravel', $json['extra']);
+        $this->assertSame([
+            'aliases' => [
+                'JsonApi' => JsonApi::class,
+                'JsonApiRoute' => JsonApiRoute::class,
+            ],
+            'providers' => [
+                ServiceProvider::class,
+            ],
+        ], $json['extra']['laravel']);
+    }
+}